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Please contact a Renesas Electronics sales office if you have any questions regarding the information contained in this document or Renesas Electronics products, or if you have any other inquiries. (Note 1) "Renesas Electronics" as used in this document means Renesas Electronics Corporation and also includes its majorityowned subsidiaries. (Note 2) "Renesas Electronics product(s)" means any product developed or manufactured by or for Renesas Electronics. User's Manual How to Use IC for RS-232 Line Driver/Receivers PD4711B PD4712C/4712D PD4713A PD4714A PD4715A PD4721 PD4722 PD4723 PD4724 PD4726 Document No. S13354EJ3V0UM00 (3rd edition) Date Published June 2003 NS CP(K) 1998 Printed in Japan [MEMO] 2 User's Manual S13354EJ3V0UM * The information in this document is current as of June, 2003. The information is subject to change without notice. For actual design-in, refer to the latest publications of NEC Electronics data sheets or data books, etc., for the most up-to-date specifications of NEC Electronics products. Not all products and/or types are available in every country. Please check with an NEC Electronics sales representative for availability and additional information. * No part of this document may be copied or reproduced in any form or by any means without the prior written consent of NEC Electronics. NEC Electronics assumes no responsibility for any errors that may appear in this document. * NEC Electronics does not assume any liability for infringement of patents, copyrights or other intellectual property rights of third parties by or arising from the use of NEC Electronics products listed in this document or any other liability arising from the use of such products. No license, express, implied or otherwise, is granted under any patents, copyrights or other intellectual property rights of NEC Electronics or others. * Descriptions of circuits, software and other related information in this document are provided for illustrative purposes in semiconductor product operation and application examples. The incorporation of these circuits, software and information in the design of a customer's equipment shall be done under the full responsibility of the customer. NEC Electronics assumes no responsibility for any losses incurred by customers or third parties arising from the use of these circuits, software and information. * While NEC Electronics endeavors to enhance the quality, reliability and safety of NEC Electronics products, customers agree and acknowledge that the possibility of defects thereof cannot be eliminated entirely. To minimize risks of damage to property or injury (including death) to persons arising from defects in NEC Electronics products, customers must incorporate sufficient safety measures in their design, such as redundancy, fire-containment and anti-failure features. * NEC Electronics products are classified into the following three quality grades: "Standard", "Special" and "Specific". The "Specific" quality grade applies only to NEC Electronics products developed based on a customerdesignated "quality assurance program" for a specific application. The recommended applications of an NEC Electronics product depend on its quality grade, as indicated below. Customers must check the quality grade of each NEC Electronics product before using it in a particular application. "Standard": Computers, office equipment, communications equipment, test and measurement equipment, audio and visual equipment, home electronic appliances, machine tools, personal electronic equipment and industrial robots. "Special": Transportation equipment (automobiles, trains, ships, etc.), traffic control systems, anti-disaster systems, anti-crime systems, safety equipment and medical equipment (not specifically designed for life support). "Specific": Aircraft, aerospace equipment, submersible repeaters, nuclear reactor control systems, life support systems and medical equipment for life support, etc. The quality grade of NEC Electronics products is "Standard" unless otherwise expressly specified in NEC Electronics data sheets or data books, etc. If customers wish to use NEC Electronics products in applications not intended by NEC Electronics, they must contact an NEC Electronics sales representative in advance to determine NEC Electronics' willingness to support a given application. (Note) (1) "NEC Electronics" as used in this statement means NEC Electronics Corporation and also includes its majority-owned subsidiaries. (2) "NEC Electronics products" means any product developed or manufactured by or for NEC Electronics (as defined above). M8E 02. 11-1 User's Manual S13354EJ3V0UM 3 The mark shows major revised points. 4 User's Manual S13354EJ3V0UM CONTENTS 1. INTRODUCTION ............................................................................................................................... 7 2. FEATURES OF ICS FOR RS-232 LINE DRIVER/RECEIVERS .................................................... 7 3. SERIES LINEUP............................................................................................................................... 3.1 Selection Guide........................................................................................................................ 3.2 Ordering Information............................................................................................................... 8 8 8 4. PACKAGE DRAWINGS, PIN CONFIGURATIONS, AND FUNCTIONAL BLOCK DIAGRAMS......................................................................................................................... 9 4.1 Package Drawings ................................................................................................................... 9 4.2 Pin Configurations................................................................................................................... 14 4.3 Functional Block Diagrams .................................................................................................... 17 5. BASIC OPERATIONS ...................................................................................................................... 18 5.1 Basic Operation of PD471X Series....................................................................................... 18 5.2 Basic Operation of PD472X Series....................................................................................... 18 6. INTERNAL BLOCK DIAGRAMS .................................................................................................... 19 6.1 PD471X Series........................................................................................................................ 19 6.1.1 DC/DC converter block ............................................................................................................... 19 6.1.2 Driver output logic ...................................................................................................................... 20 6.1.3 Receiver output logic ................................................................................................................. 20 6.1.4 Receiver input threshold voltage .............................................................................................. 20 6.1.5 Input pin treatment ..................................................................................................................... 21 6.2 PD472X Series........................................................................................................................ 22 6.2.1 DC/DC Converter Block .............................................................................................................. 22 6.2.2 Driver output logic ...................................................................................................................... 23 6.2.3 Receiver output logic ................................................................................................................. 23 6.2.4 Switching voltage boosting mode............................................................................................. 23 6.2.5 Input pin treatment ..................................................................................................................... 24 7. NOTES FOR USE ........................................................................................................................... 25 8. TYPICAL CHARACTERISTICS ....................................................................................................... 26 9. RS-232 STANDARD......................................................................................................................... 9.1 What is the RS-232 Standard?................................................................................................ 9.2 Signal Level .............................................................................................................................. 9.3 Basics of RS-232C Communication....................................................................................... 32 32 32 33 10. TYPICAL APPLICATION ................................................................................................................. 34 11. REVISION HISTORY OF PRODUCTS .......................................................................................... 35 User's Manual S13354EJ3V0UM 5 12. Q&A ................................................................................................................................................... 12.1 Internal Circuit Functions ..................................................................................................... 12.2 Characteristics of Boosting Circuit ..................................................................................... 12.3 External Capacitors ............................................................................................................... 12.4 Transfer Rate.......................................................................................................................... 12.5 Reliability ................................................................................................................................ 12.6 Marking, Packages and Others ............................................................................................ 36 36 37 38 39 42 43 APPENDIX ELECTRICAL SPECIFICATIONS ...................................................................................... 45 Appendix 1. Main Characteristics of PD471X Series (Ex.: PD4714A) .................................. 45 Appendix 2. Main Characteristics of PD472X Series (Ex.: PD4724) .................................... 47 6 User's Manual S13354EJ3V0UM 1. INTRODUCTION The serial communication standard EIA/TIA-232-E (generally called "RS-232"), established by EIA and TIA, has been used for industrial devices. However, today it is widely used as a communication means between office automation equipment that equips serial interface, and PCs and PC peripheral devices or home appliances. NEC Electronics lines up six PD471X Series products and five PD472X Series products so that they can be widely applied to various devices for industrial equipment and appliances as ICs for RS-232 line driver/receivers. This document summarizes usage of the products, technical data, and notes for using these ICs. Your necessary information is found as follows: * For overview of RS-232 standard: Refer to Chapter 9. RS-232 STANDARD. * For overview and list of NEC Electronics's Refer to Chapter 2. FEATURES OF ICS FOR RS-232 LINE products: DRIVER/RECEIVERS and Chapter 3. SERIES LINEUP. * For details on functions of NEC Electronics's Refer to Chapter 6. INTERNAL BLOCK DIAGRAMS. products: Refer to Chapter 8. TYPICAL CHARACTERISTICS. * For characteristics and performance of NEC Electronics's products: Refer to Chapter 12. Q&A. * For answers to common questions and how-to: 2. FEATURES OF ICS FOR RS-232 LINE DRIVER/RECEIVERS There are two types of product series of ICs for RS-232 Line Driver/Receiver, and each type has following features: ! PD471X Series * Compliant with EIA/TIA-232-E standard. * Operated by single power supply with voltage of +5 V * Positive and negative outputs by four external capacitors and on-chip DC/DC converter * On-chip driver output control functions * Function for selecting receiver input threshold voltage * Low current dissipation mode by standby function * Two types of packages: DIP and SOP ! PD472X Series * Complied with EIA/TIA-232-E Standard * Operated by single power supply with either voltage of +5 V or +3.3 V * Positive and negative outputs by four or five external capacitors and on-chip DC/DC converter * Low current dissipation mode by standby function * On-chip receiver functions which can be operated during standby * SSOP package for space saving User's Manual S13354EJ3V0UM 7 3. SERIES LINEUP 3.1 Selection Guide The list of ICs for RS-232 line driver/receivers is shown below. Driver Receive r Power Supply Voltage Standby Driver Output Control Low Current Dissipation Receiver Operation Mode PD4711B 2 2 5V ! ! x PD4712C 4 4 5V ! ! x PD4712D 4 4 5V ! ! x PD4713A 3 3 5V ! ! x PD4714A 3 5 5V ! ! x PD4715A 5 3 5V ! ! x PD4721 2 2 3.3/5 V ! x x PD4722 4 4 3.3/5 V ! x ! PD4723 3 3 3.3/5 V ! x ! PD4724 3 5 3.3/5 V ! x ! PD4726 4 7 5V ! x ! Part Number !: Available x: Not available 3.2 Ordering Information Ordering information and the package list of ICs for RS-232 line driver/receivers are shown below. Part Number PD4711B Package PD4711BCX 20-pin DIP (7.62 mm (300) ) PD4711BGS 20-pin SOP (7.62 mm (300) ) PD4712CCY 28-pin DIP (10.16 mm (400) ) PD4712CGT 28-pin SOP (9.53 mm (375) ) PD4712DCY 28-pin DIP (10.16 mm (400) ) PD4712DGT 28-pin SOP (9.53 mm (375) ) PD4713ACX 24-pin DIP (7.62 mm (300) ) PD4713AGT 24-pin SOP (9.53 mm (375) ) PD4714ACY 28-pin DIP (10.16 mm (400) ) PD4714AGT 28-pin SOP (9.53 mm (375) ) PD4715ACY 28-pin DIP (10.16 mm (400) ) PD4715AGT 28-pin SOP (9.53 mm (375) ) PD4721 PD4721GS-GJG 20-pin SSOP (7.62 mm (300) ) PD4722 PD4722GS-GJG 30-pin SSOP (7.62 mm (300) ) PD4723 PD4723GS-GJG 30-pin SSOP (7.62 mm (300) ) PD4724 PD4724GS-GJG 30-pin SSOP (7.62 mm (300) ) PD4726 PD4726GS-BAF 36-pin SSOP (7.62 mm (300) ) PD4712C PD4712D PD4713A PD4714A PD4715A 8 Ordering Information User's Manual S13354EJ3V0UM 4. PACKAGE DRAWINGS, PIN CONFIGURATIONS, AND FUNCTIONAL BLOCK DIAGRAMS 4.1 Package Drawings 20-PIN PLASTIC DIP (7.62mm(300)) 20 11 1 10 A K J L P I H C F D N R M B G M NOTES 1. Each lead centerline is located within 0.25 mm of its true position (T.P.) at maximum material condition. 2. ltem "K" to center of leads when formed parallel. ITEM MILLIMETERS A B 25.40 MAX. 1.27 MAX. C 2.54 (T.P.) D F 0.500.10 1.1 MIN. G 3.50.3 H 0.51 MIN. I 4.31 MAX. J 5.08 MAX. K 7.62 (T.P.) L 6.4 M 0.25 +0.10 -0.05 N 0.25 P 0.9 MIN. R 015 P20C-100-300A,C-2 24-PIN PLASTIC DIP (7.62mm(300)) 24 13 1 12 A K J I H G L P F D C N M M R B NOTES ITEM MILLIMETERS 1. Each lead centerline is located within 0.25 mm of its true position (T.P.) at maximum material condition. A B 33.02 MAX. 2.54 MAX. 2. ltem "K" to center of leads when formed parallel. C D F 2.54 (T.P.) 0.500.10 1.2 MIN. G 3.50.3 H 0.51 MIN. I 4.31 MAX. J 5.08 MAX. K 7.62 (T.P.) L 6.4 M 0.25 +0.10 -0.05 N 0.25 P 1.0 MIN. R 015 P24C-100-300A-2 User's Manual S13354EJ3V0UM 9 28-PIN PLASTIC DIP (10.16mm(400)) 28 15 1 14 A K J L P I F H C D G N M M R B NOTES ITEM MILLIMETERS A B 35.56 MAX. 1.27 MAX. 1. Each lead centerline is located within 0.25 mm of its true position (T.P.) at maximum material condition. C 2. ltem "K" to center of leads when formed parallel. 2.54 (T.P.) D 0.500.10 F 1.1 MIN. G H 3.50.3 0.51 MIN. I 4.31 MAX. J 5.72 MAX. K 10.16 (T.P.) L 8.6 0.25 +0.10 -0.05 M N 0.25 P 0.9 MIN. R 015 P28C-100-400-2 20-PIN PLASTIC SOP (7.62 mm (300)) 20 11 detail of lead end P 1 10 A H I G J S L B C D M M N K S E F NOTE ITEM Each lead centerline is located within 0.12 mm of its true position (T.P.) at maximum material condition. MILLIMETERS A 12.70.3 B 0.78 MAX. C 1.27 (T.P.) D 0.42 +0.08 -0.07 E 0.10.1 F 1.8 MAX. G 1.550.05 H 7.70.3 I 5.60.2 J 1.1 K 0.22 +0.08 -0.07 L M 0.60.2 0.12 N 0.10 P 3 +7 -3 P20GM-50-300B, C-7 10 User's Manual S13354EJ3V0UM 24-PIN PLASTIC SOP (9.53 mm (375)) 24 13 detail of lead end P 1 12 A H F G I J S C D M B L S N K M E NOTE Each lead centerline is located within 0.12 mm of its true position (T.P.) at maximum material condition. ITEM MILLIMETERS A 15.40.14 B 0.78 MAX. C 1.27 (T.P.) D 0.42 +0.08 -0.07 E 0.1250.075 F 2.77 MAX. G 2.470.1 H 10.30.3 I 7.2 J 1.6 K 0.17 +0.08 -0.07 L M 0.80.2 0.12 N 0.15 P 3 +7 -3 P24GM-50-375B-6 28-PIN PLASTIC SOP (9.53 mm (375)) 28 15 detail of lead end P 1 14 A H F I G J S C D M B L N M S K E NOTE Each lead centerline is located within 0.12 mm of its true position (T.P.) at maximum material condition. ITEM A MILLIMETERS 17.90.17 B 0.78 MAX. C 1.27 (T.P.) D 0.42 +0.08 -0.07 E 0.10.1 F 2.60.2 G 2.50 H 10.30.3 I 7.20.2 J 1.60.2 K 0.17 +0.08 -0.07 L 0.80.2 M 0.12 N 0.15 P 3 +7 -3 P28GM-50-375B-5 User's Manual S13354EJ3V0UM 11 20-PIN PLASTIC SSOP (7.62 mm (300)) 20 11 detail of lead end P 1 10 A H F I G J S N L S K C D M B M E NOTE ITEM A Each lead centerline is located within 0.12 mm of its true position (T.P.) at maximum material condition. B MILLIMETERS 6.70.3 0.575 MAX. C 0.65 (T.P.) D 0.32 +0.08 -0.07 E 0.1250.075 F G H 2.0 MAX. 1.70.1 8.10.3 I J 6.10.2 1.00.2 K 0.15 +0.10 -0.05 L M N P 0.50.2 0.12 0.10 3 +7 -3 P20GM-65-300B-4 30-PIN PLASTIC SSOP (7.62 mm (300)) 30 16 detail of lead end P 1 15 A F H G I J S C D M N S B L K M E NOTE Each lead centerline is located within 0.10 mm of its true position (T.P.) at maximum material condition. ITEM A B MILLIMETERS 9.850.26 0.51 MAX. C 0.65 (T.P.) D 0.32 +0.08 -0.07 E F G H I J K L M N P 0.1250.075 2.0 MAX. 1.70.1 8.10.2 6.10.2 1.00.2 +0.08 0.17 -0.07 0.50.2 0.10 0.10 3 +7 -3 P30GS-65-300B-3 12 User's Manual S13354EJ3V0UM 36-PIN PLASTIC SSOP (7.62 mm (300)) 36 19 detail of lead end R 1 18 A H F I G J S C L B N K D M S M E NOTE Each lead centerline is located within 0.10 mm of its true position (T.P.) at maximum material condition. ITEM A MILLIMETERS 15.30.24 B 0.97 MAX. C 0.8 (T.P.) D 0.37 +0.08 -0.07 E 0.1250.075 D 1.675+0.125 -0.175 G 1.55 H 7.70.3 I 5.60.15 G 1.050.2 K 0.22+0.08 -0.07 L 0.60.2 M N 0.10 0.10 R 55 P36GM-80-300B-5 User's Manual S13354EJ3V0UM 13 4.2 Pin Configurations PD4711B PD4712C/D + 10 V 1 VDD C3 + C4+ 20 2 C1+ GND 19 3 VCC C4- 18 4 C1- VSS 17 C1 + +5V STBY 5 DIN1 6 DIN2 7 + C4 + C2 + 10 V 1 VDD C3 + C4+ 28 2 C1+ GND 27 3 VCC C4- 26 4 C1- VSS 25 C1 + +5V - 10 V 5 GND 16 DCON 300 300 ROUT1 8 DIN1 6 15 DOUT1 DIN2 7 14 DOUT2 DIN3 8 13 RIN1 5.5 k ROUT2 9 5.5 k GND 10 12 RIN2 DIN4 9 11 RCON DCON 10 ROUT1 11 ROUT2 12 ROUT3 13 +5V C4+ 24 2 C1+ GND 23 3 VCC C4- 22 4 C1- VSS 21 STBY 5 DIN1 6 DIN2 7 DIN3 8 + C4 300 300 300 300 300 5.5 k ROUT2 10 300 - 10 V 300 22 DOUT2 21 DOUT3 20 DOUT4 19 RIN1 5.5 k 18 RIN2 5.5 k 5.5 k 5.5 k 17 RIN3 16 RIN4 15 RCON + C2 C4+ 28 2 C1+ GND 27 3 VCC C4- 26 4 C1- VSS 25 C1 + +5V - 10 V 5 GND 19 DOUT1 18 DOUT2 17 DOUT3 DIN1 6 DIN2 7 DIN3 8 16 RIN1 DCON 9 15 RIN2 ROUT1 10 14 RIN3 ROUT2 11 13 RCON ROUT3 12 5.5 k ROUT3 11 5.5 k ROUT4 13 ROUT5 14 14 C2 23 DOUT1 + 10 V 1 VDD C3 + 20 DCON ROUT1 9 GND 12 + PD4714A + 10 V 1 VDD C3 + C1 + C4 24 STBY ROUT4 14 PD4713A + User's Manual S13354EJ3V0UM + C4 24 STBY 300 300 300 5.5 k 5.5 k 5.5 k 5.5 k 5.5 k 23 DOUT1 22 DOUT2 21 DOUT3 20 RIN1 19 RIN2 18 RIN3 17 RIN4 16 RIN5 15 RCON + C2 - 10 V PD4721 PD4715A + 10 V 1 VDD C3 + C1 + +5V C4+ 28 2 C1 + GND 27 3 VCC C4- 26 4 C1- VSS 25 5 GND DIN1 6 300 DIN2 7 300 DIN3 8 300 DIN4 9 300 DIN5 10 5.5 k ROUT2 13 + C2 5.5 k GND 19 3 VCC C4- 18 4 C1- VSS 17 - 10 V 5 C5+ C5 22 DOUT2 DIN1 7 21 DOUT3 DIN2 8 20 DOUT4 ROUT1 9 19 DOUT5 ROUT2 10 C4 + C2 - 10 V 16 STBY 6 C5- 23 DOUT1 + 15 VCHA 300 300 14 DOUT1 13 DOUT2 12 RIN1 5.5 k 11 RIN2 5.5 k 17 RIN2 16 RIN3 PD4723 + 10 V 1 VDD C3 + C3 + 2 C1 + + + 3.3 V C1 or +5V PD4722 C1 + C4+ 20 15 RCON ROUT3 14 + 3.3 V or +5V - 10 V 1 VDD C3 + 18 RIN1 5.5 k ROUT1 12 C4 24 STBY 300 DCON 11 + C4+ 30 2 C1 + GND 29 3 VCC C4- 28 4 C1- VSS 27 + C4 + 26 STBY 6 GND 25 VCHA DIN2 9 DIN3 10 DIN4 11 2 C1 + GND 29 3 VCC C4- 28 4 C1- VSS 27 C1 + C3 + 300 300 300 300 22 DOUT2 C4 26 STBY 6 GND 25 VCHA DIN1 8 DIN2 9 21 DOUT3 DIN3 10 20 DOUT4 ROUT1 11 + C2 - 10 V 24 EN 7 C5 23 DOUT1 + 5 C5+ - 24 EN 7 C5 DIN1 8 + 3.3 V or +5V C4+ 30 - 10 V 5 C5+ - C2 + 10 V 1 VDD C3 + 300 300 300 23 DOUT1 22 DOUT2 21 DOUT3 20 RIN1 5.5 k ROUT1 12 ROUT2 12 19 RIN1 5.5 k ROUT2 13 ROUT3 13 18 RIN2 5.5 k ROUT3 14 19 RIN2 5.5 k 18 RIN3 5.5 k 17 RIN3 NC 14 17 NC 16 RIN4 NC 15 16 NC 5.5 k ROUT4 15 5.5 k User's Manual S13354EJ3V0UM 15 PD4724 + 3.3 V or +5V PD4726 + 10 V 1 VDD C3 + C4+ 30 2 C1+ GND 29 3 VCC C4- 28 4 C1- VSS 27 C1 + C3 + + 5 C5 + C4 + C2 + 3.3 V or +5V - 7 C5 300 DIN1 8 300 DIN2 9 300 DIN3 10 ROUT1 11 C4- 36 2 C1- GND 35 3 VCC C4- 34 C1 + - 10 V 26 STBY 6 GND + 10 V 1 VDD C3 + 4 C1- 5 NC 25 VCHA 6 GND 24 EN 7 NC 23 DOUT1 22 DOUT2 21 DOUT3 To internal circuit 300 300 DIN3 10 19 RIN2 ROUT1 12 32 STBY 31 VCHA 30 EN 300 DIN2 9 DIN4 11 300 29 DOUT1 28 DOUT2 27 DOUT3 26 DOUT4 5.5 k ROUT2 12 5.5 k ROUT3 13 18 RIN3 ROUT4 14 ROUT2 13 24 RIN2 5.5 k 17 RIN4 ROUT3 14 5.5 k ROUT5 15 25 RIN1 5.5 k 5.5 k 23 RIN3 5.5 k 16 RIN5 ROUT4 15 5.5 k 22 RIN4 5.5 k 21 RIN5 ROUT5 16 5.5 k 20 RIN6 ROUT6 17 5.5 k ROUT7 18 16 User's Manual S13354EJ3V0UM C4 VSS 33 To internal circuit DIN1 8 20 RIN1 + 19 RIN7 5.5 k + C2 - 10 V 4.3 Functional Block Diagrams PD471X Series DOUT RIN VDD C3 VCC C1 10 V DC/DC Converter C4 10 V Threshold voltage GND C4 VSS STBY DCON RCON DIN ROUT PD472X Series C5 VCHA (Type1) RIN DOUT (Type2) RIN VDD C3 VCC C1 10 V DC/DC Converter C4 10 V Threshold voltage GND C4 VSS STBY EN DIN User's Manual S13354EJ3V0UM ROUT ROUT 17 5. BASIC OPERATIONS 5.1 Basic Operation of PD471X Series The basic operation of the PD471X Series is shown in the figure below. STBY VDD VSS DCON DIN DOUT Hi-Z Hi-Z Hi-Z Hi-Z RCON RIN ROUT Remark Hi-Z: High impedance 5.2 Basic Operation of PD472X Series The basic operation of the PD472X Series is shown in the figure below. STBY VCHA 3V 5V VCC VDD VSS DIN DOUT Hi-Z Hi-Z EN RIN ROUTA ROUTB 18 User's Manual S13354EJ3V0UM 6. INTERNAL BLOCK DIAGRAMS 6.1 PD471X Series 6.1.1 DC/DC converter block The PD471X Series incorporate a DC/DC converter block. A DC/DC converter is a circuit to boost VCC to VDD/VSS to generate the necessary voltage level for RS-232 communication by fast switching with external capacitors. RS-232 communication, which requires positive and negative power supplies even with a single voltage of 5 V, can be achieved by integrating this circuit with a RS-232 line driver/receiver. The maximum voltage of electric potential difference applied at the both ends of each capacitor having characteristics of DC/DC converter circuit is shown in the table below, and the theoretical operating waveform of each pin is shown in the figure below. Also, DC/DC converter circuit is stopped when STBY is at H. At this moment, VDD = VCC and VSS = GND. The electric potential difference applied to each capacitor when VCC = 5 V Capacitor Voltage (V) + - 5 + - 10 + - C3 - C3 5 C4+ - C4- 5 C1 - C1 C2 - C2 Operating waveform at capacitors STBY 5V 0V 10 V C1+ 5V 0V C1- -5V 10 V 5V C4+ 0V C4- -5V VDD 10 V 5V 0V - 10 V VSS User's Manual S13354EJ3V0UM 19 6.1.2 Driver output logic STBY is the Standby Control Signal. When STBY is at H, DOUT becomes high impedance regardless of the status of DCON and DIN. While STBY is at L, driver output depends on input signals from DCON and DIN. DCON is driver output control signal and active at high. When DCON is H, DIN (TTL level) is reversed and output from DOUT (RS-232 level). While DCON is L, DOUT is fixed at L regardless of the status of DIN. Truth table of driver output logic is shown below (refer to 12.1 Internal Circuit Functions in 12. Q&A for actual usage of DCON). STBY DCON DIN DOUT Remarks H X X Hi-Z L L X L Mark level output L H L H Space level output L H H L Mark level output Standby mode (DC/DC Converter stopped) Remark H: High level, L: Low level, X: H or L 6.1.3 Receiver output logic When STBY is at H, ROUT becomes High Impedance state regardless of the status of RIN. While STBY is at L, RIN (RS-232 level) is reversed and output from ROUT (TTL level). Truth table of receiver output logic is shown below. STBY RIN ROUT Remarks H X Hi-Z L L H Mark level output L H L Space level output Standby Mode (DC/DC converter stopped) 6.1.4 Receiver input threshold voltage The PD471X Series has a function to switch receiver input threshold voltage as its specific function. Refer to individual data sheet for characteristics of threshold voltage. When RCON is at L, ROUT always operates in A Mode. When RCON is at H, RINA operates in A Mode and RINB operates in B Mode as the table below. The truth table and pin list of each part number are shown below (refer to 12.1 Internal Circuit Functions in 12. Q&A for actual usage of RCON) The truth table of receiver input threshold 20 RCON RINA RINB L A Mode A Mode H A Mode B Mode (C Mode only in PD4712D) User's Manual S13354EJ3V0UM The pin list of each product in A Mode and B Mode Part Number RINA RINB - RIN1, RIN2 RIN1, RIN2 RIN3, RIN4 PD4713A RIN1 RIN2, RIN3 PD4714A RIN1, RIN2, RIN3 RIN4, RIN5 PD4715A RIN1 RIN2, RIN3 PD4711B PD4712C/4712D 6.1.5 Input pin treatment The internal configuration of input pins of the PD471X Series is shown in the table below. If an input pin is opened, through current flows as CMOS-specific characteristics. Therefore, open pins should be treated as follows: Pin Name Pull-up or Pull-down Resistor STBY Pull-down resistor DCON None Handling of Open Pins Even if the input is open, the input becomes "L" and the operationmode is active. Be sure to fix it at "H" or "L" level before using. DIN RCON RIN Pull-down resistor (5.5 k) Even if the input is open, the input becomes "L" and the output becomes "H." User's Manual S13354EJ3V0UM 21 6.2 PD472X Series 6.2.1 DC/DC converter block The PD472X Series incorporates a DC/DC converter block. A DC/DC converter Block is a circuit to boost VCC to VDD/VSS to generate the necessary voltage level for RS-232 communication by fast switching with external capacitors. It has a Double Boosting Mode and Triple Boosting Mode to use single power supply either voltage with 5 V or 3.3 V as specific function of PD472X Series. RS-232 communication, which requires positive and negative power supplies even with a single voltage of 5 V or 3.3 V, can be achieved by integrating this circuit with an RS-232 line driver/receiver. The maximum voltage of electric potential difference applied at both ends of each capacitor having characteristics of DC/DC converter circuit is shown in the table below, and theoretical operating waveform of each pin (Only in 3-V mode. The waveform in 5-V mode is the same as the one of the PD471X Series.) is shown in the figure below. Also, DC/DC Converter circuit is stopped when STBY is at L. At this moment, VDD = VCC and VSS = GND. Electric potential difference applied to each capacitor when VCC = 5 V (5-V Mode) or 3 V (3-V Mode) Voltage (V) Capacitor C1+ - C1- 5-V Mode 3-V Mode 5.0 3.0 + - 10.0 9.0 + - 5.0 6.0 + - 5.0 3.0 + - 5.0 3.0 C2 - C2 C3 - C3 C4 - C4 C5 - C5 Operating waveform at capacitors STBY 3V 0V 6V 3V 0V -3V -6V C1+ C1- 9V 6V 3V 0V -3V C4+ C4- C5+ 3V 0V C5- -6V -9V 10 V VDD 3V 0V VSS - 10 V 22 User's Manual S13354EJ3V0UM 6.2.2 Driver output logic When STBY is at L, DOUT becomes high impedance regardless of the status of DCON and DIN. When STBY is H, DIN (TTL level) is reversed and output from DOUT (RS-232 level). The truth table of driver output logic is shown below. STBY DIN DOUT Remarks L X Hi-Z H L H Space level output H H L Mark level output Standby Mode (DC/DC converter stopped) 6.2.3 Receiver output logic When STBY is at L, two types of standby modes can be selected depending on the EN logic. When EN is L, regardless of the status of RIN (RS-232 level), H is output for ROUT (TTL level). When EN is H, ROUTA (TTL level) is output by an inverter without hysteresis for the input of RINA (RS-232 level). Regardless of RINB (RS-232 level), H is output for ROUTB (TTL level). When STBY is H, RIN (RS-232 level) is reversed and output from ROUT (TTL level) regardless of the EN state. The truth table of the receiver output logic is shown below (refer to 12.1 Internal Circuit Functions in 12. Q&A for actual sample usage of EN pin). Truth table of receiver output logic RIN STBY ROUT EN Remarks RINA RINB ROUTA ROUTB L L X X H H Standby Mode 1 (DC/DC converter stopped) L H L X H H Standby Mode 2 (DC/DC converter stopped) L H H X L H Standby Mode 2 (DC/DC converter stopped) H X L H Mark level output H X H L Space level output Pin list of each product in A Mode and B Mode Part Number RINA RINB PD4721 - RIN1, RIN2 PD4722 RIN3, RIN4 RIN1, RIN2 PD4723 RIN2, RIN3 RIN1 PD4724 RIN4, RIN5 RIN1, RIN2, RIN3 PD4726 RIN6, RIN7 RIN1, RIN2, RIN3, RIN4, RIN5 6.2.4 Switching voltage boosting mode Voltage boosting mode of internal DC/DC converter can be switched by VCHA. When the voltage of the power supply used is lowered (5 V 3 V), it can be switched even when the power is turned on. When you switch the voltage boosting mode, the operation mode must be Standby Mode (STBY = L). VCHA Operating Mode L 5-V Mode (double boost) H 3-V Mode (triple boost) User's Manual S13354EJ3V0UM 23 6.2.5 Input pin treatment The internal configuration of input pins of the PD472X Series is shown in the table below. If an input pin is left open, through current flows due to CMOS-specific characteristics. Therefore, open pins should be treated as follows. Pin Name STBY Note Pull-up or Pull-down Resistor None Handling of Open Pin Fix to "H" or "L" level. VCHA EN DIN Active pull-up resistor (up to 300 k) Even if the input is open, the input becomes "H" and the output becomes "L." RIN Pull-down resistor (5.5 k) Even if the input is open, the input becomes "L" and the output becomes "H." A pull-up resistor is connected to the DIN pin so that the input potential is fixed even it is opened. This pull-up resistor is an active resistor whose resistance becomes higher when the input potential is low and becomes lower when the input potential is high (refer to 8. TYPICAL CHARACTERISTICS). Therefore, when the input voltage is L, the current passed through the pull-up resistor is 25 A MAX., and the power dissipation due to the input current is negligibly low. Also, fix the DIN pin open or to H to minimize the power dissipation in Standby (STBY = L). At this time, the input current is 1 A or lower, and the power dissipation due to the input current through pull-up resistor is minimized. Note PD4726 has a pull-down resistor in STBY pin. Therefore, when the input of PD4726 is open, the input becomes "L" and the operation mode is standby. 24 User's Manual S13354EJ3V0UM 7. NOTES FOR USE The following items are general notes for using ICs for RS-232 line driver/receivers. They are common between the PD471X Series and the PD472X Series unless otherwise specified. Power block * If VCC is unstable, the on-chip DC/DC converter circuit may not properly operate. Therefore, it is recommended to connect a bypass capacitor (approximately 0.1 to 1 F) between VCC and GND. * Since VDD and VSS are output pins and their voltages are boosted up by the internal DC/DC converter circuit, do not feed or take out current to/from these pins (such as connecting any load). If any load is connected to these pins, the on-chip DC/DC converter circuit may not properly operate (refer to 12.2 Characteristics of Boosting Circuit in 12. Q&A for typical characteristics). Pin treatment * Fix all pins for control input (such as DCON, RCON, and STBY pins) to High or Low, if no pull-down resistor is connected to them. * If a driver input pin is open, through current may flow. Fix all unconnected driver input pins to High or Low (for PD471X Series). * Ensure that voltage over rated voltage such as surge is not impressed to receiver input pins. If there is a possibility that the voltage higher than rated voltage is applied, it is recommended to connect an external protection circuit (refer to 12.5 Reliability in 12. Q&A for a typical application). Selection of external capacitors * Tantalum, aluminum electrolytic, and ceramic capacitors can be used for external capacitors for on-chip DC/DC converters. Since they are repeatedly charged and discharged by internal switching, use capacitors with better frequency characteristics. * It is recommended to apply capacitors with a capacitance range of 4.7 to 47 F (for the PD471X Series, excepting the PD4711B with capacitance range of 1 to 47 F) and 0.33 to 4.7 F (for the PD472X Series, excepting PD4722 with capacitance range of 0.47 to 4.7 F). Determine appropriate capacitance within these ranges after evaluating with the actual product circuit. Note that the capacitance of electrolytic capacitors is lowered in low temperatures. Therefore, determine the capacitance of such capacitors with some margin taking into account the operating temperature. * If only 5-V Mode (VCHA ="L" and VCC = 5 V) is used, it is not necessary to connect the C5 capacitor. In this case, the C5 pin should be left open (for PD472X Series). User's Manual S13354EJ3V0UM 25 8. TYPICAL CHARACTERISTICS The main characteristics of the PD4722 as a representative product for RS-232 line driver/receivers are shown below. * Driver Input Characteristics The characteristics of a pull-up resistor (active resistor) at a driver input pin are shown below. (1) In 5-V Mode operation (2) In 3.3-V Mode operation * Characteristics of Driver Output slew rate vs. load capacitance The slew rate characteristics when a load capacitance is connected to driver output 1 are shown below. Conditions: VCC = 5 V and 3.3 V External capacitor = 1.0 F (Tantalum) RL = 3 k (only at one output) Note that the slew rate characteristics are lower than the curve shown here if simultaneous switching for all outputs is performed. * Characteristics of driver output voltage vs. output current The output characteristics with current at driver output are shown below. Conditions: VCC = 4.5 to 5.5 V and 3.0 to 3.6 V External capacitor = 0.47 F With all driver outputs (1) Ceramic capacitors are used. (2) Tantalum capacitors are used. (3) Aluminum electrolytic capacitors are used. * Characteristics of driver output voltage vs. external capacitors The driver output characteristics when the capacitance of external capacitor is changed are shown below. Conditons: VCC = 4.5 V and 3.0 V Load 3 k With all driver outputs 26 User's Manual S13354EJ3V0UM * Driver input characteristics VCC = +3.3 V 500.0 400 400 Pull-up resistor R (k) Pull-up resistor R (k) VCC = +5.0 V 500.0 300 200 300 200 100 0 100 0 1 2 3 4 0 5.0 0 1 Driver input voltage VDI (V) 2 3 4 5.0 Driver input voltage VDI (V) * Characteristics of driver output slew rate vs. load capacitance 15 15 Falling edge 10 Rising edge 5 0 10 VCC = 3.3 V, TA = 25 C External capacitor = 1.0 F (Tantalum) RL = 3.0 k Switching only one driver Driver output slew rate SR (V/ s) Driver output slew rate SR (V/ s) VCC = 5.0 V, TA = 25 C External capacitor = 1.0 F (Tantalum) RL = 3.0 k Switching only one driver 100 1000 10 Falling edge Rising edge 5 0 10 Load capacitance CL (pF) 100 1000 Load capacitance CL (pF) User's Manual S13354EJ3V0UM 27 * Characteristics of driver output voltage vs. output current (Ceramic capacitors used) C1 to C5 = 0.47 F VCC = 5.5 V 0 VCC = 5.0 V VCC = 4.5 V 8 6 4 2 0 - 5.0 Driver output voltage at "-" side VDO (V) Driver output voltage at "+" side VDO (V) 10.0 -2 -4 -6 VCC = 4.5 V VCC = 5.0 V -8 VCC = 5.5 V - 10.0 0 0 Driver output current IDO (mA) Driver output current IDO (mA) 0 VCC = 3.6 V VCC = 3.3 V VCC = 3.0 V 8 6 4 2 Driver output voltage at "-" side VDO (V) Driver output voltage at "+" side VDO (V) 10.0 -2 -4 VCC = 3.0 V -6 VCC = 3.3 V VCC = 3.6 V -8 - 10.0 0 - 5.0 0 0 Driver output current IDO (mA) 28 5.0 5.0 Driver output current IDO (mA) User's Manual S13354EJ3V0UM * Characteristics of driver output voltage vs. output current (Tantalum capacitors used) C1 to C5 = 0.47 F VCC = 5.5 V 0 VCC = 5.0 V VCC = 4.5 V 8 6 4 2 0 - 5.0 Driver output voltage at "-" side VDO (V) Driver output voltage at "+" side VDO (V) 10.0 -2 -4 -6 VCC = 4.5 V VCC = 5.0 V -8 VCC = 5.5 V - 10.0 0 0 Driver output current IDO (mA) Driver output current IDO (mA) 0 VCC = 3.6 V 10.0 VCC = 3.3 V VCC = 3.0 V 8 6 4 2 Driver output voltage at "-" side VDO (V) Driver output voltage at "+" side VDO (V) 5.0 -2 -4 VCC = 3.0 V -6 VCC = 3.3 V VCC = 3.6 V -8 - 10.0 0 - 5.0 0 0 Driver output current IDO (mA) 5.0 Driver output current IDO (mA) User's Manual S13354EJ3V0UM 29 * Characteristics of driver output voltage vs. output current (Aluminum electrolytic capacitors used) C1 to C5 = 0.47 F 0 VCC = 5.5 V VCC = 5.0 V VCC = 4.5 V 8 6 4 2 Driver output voltage at "-" side VDO (V) Driver output voltage at "+" side VDO (V) 10.0 -2 -4 -6 VCC = 4.5 V VCC = 5.0 V VCC = 5.5 V -8 - 10.0 0 - 5.0 0 0 Driver output current IDO (mA) 10.0 5.0 Driver output current IDO (mA) VCC = 3.6 V 0 VCC = 3.0 V 8 6 4 2 Driver output voltage at "-" side VDO (V) Driver output voltage at "+" side VDO (V) VCC = 3.3 V -2 -4 VCC = 3.0 V VCC = 3.3 V -6 VCC = 3.6 V -8 - 10.0 0 - 5.0 0 0 Driver output current IDO (mA) 30 5.0 Driver output current IDO (mA) User's Manual S13354EJ3V0UM * Characteristics of driver output voltage vs. external capacitors (Tantalum capacitors used) RL = 3 k, TA = 25C (With all driver outputs) VCC = 4.5 V VCC = 3.0 V 10 10 8 8 VOH 6 6 4 Output Voltage (V) Output Voltage (V) 4 VOH 2 0 -2 -4 2 0 -2 -4 -6 VOL -8 -6 VOL - 10 -8 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 - 10 0 0.1 0.2 0.3 0.4 0.5 Capacitance (F) 0.6 0.7 0.8 0.9 1 Capacitance (F) User's Manual S13354EJ3V0UM 31 9. RS-232 STANDARD 9.1 What is the RS-232 Standard? RS-232 is a standardized serial interface that defines the mechanical and electrical characteristics for connecting DTE (Data Terminal Equipment) and DCE (Data Communication Equipment) devices, and was developed by the EIA (Electrical Industries Association) in the U.S.A. This standard is generally called RS-232-C. The official name of the standard is now "EIA/TIA-232-E", but "RS-232-C" is used in this document, as this term is widely used. RS-232-C specifies electrical specifications, types of signal cables and connector specifications, and is originally referred as an interface standard to connect modems and data pins (such as PC) to each other. The main characteristics of RS-232-C are shown below. Characteristics of driver block Item Standard Value Unit Data transfer rate MAX.: 20 kbps Output voltage MAX.: 15 (Unloaded) V Output voltage MIN.: 5 (3 k) V Slew rate MAX.: 30 V/ns Characteristics of receiver block Item Standard Value Unit Note Load capacitance MAX.: 2500 Threshold voltage MAX.: 3 V Input resistance 3 to 7 k Input voltage MAX.: 25 V pF Note Load capacitance is determined by type and length of signal cable and others, however, cable length is not specified in the standard. 9.2 Signal Level Signal levels are specified in the RS-232-C standard. Low High Status Voltage level Logical level Driver output Receiver input Driver output Receiver input -5 to -15 V -3 to -25 V +5 to +15 V +3 to +25 V "1" (Mark level) "0" (Space level) The signal levels in the cable are in negative logic, reversed from logical level, in the table above. Therefore, an inverter must be inserted for a driver to output signals to the cable and a receiver must be inserted to input signals from the cable to match the internal logic (this is the role of ICs for RS-232 line driver/receivers). Since there is a potential difference (2 V) between the driver output voltage and receiver input voltage, a noise margin or magnitude drop of up to 2 V is allowed. 32 User's Manual S13354EJ3V0UM 9.3 Basics of RS-232-C Communication The typical waveforms of 8-bit data transfer are shown below. "1" PC "0" Space Cable Mark Modem "1" "0" Start Bit Stop Bit Start Bit Stop Bit Start Bit Stop Bit The following is defined in RS-232C communication. No Transfer (Idle) : Mark ("1") Transfer Start (Start Bit): Space ("0") Transfer Stop (Stop Bit) : Mark ("1") Transfer steps are as follows: (1) In the Idle state, send Start Bit to start transfer. (2) After data transfer is completed, send Stop Bit to stop transfer. (3) If succeeding data is transferred, send Start Bit after Stop Bit again to transfer the data. The Idle state must be set for periods during which no data is transferred. User's Manual S13354EJ3V0UM 33 10. TYPICAL APPLICATION Microcontroller DTR D7 D6 D5 D4 D3 D2 D1 D0 TxD Baud rate clock (transfer rate) PD71051 Conversion from PD4711B parallel to serial RS232 level conversion + 10 V 1 VDD C4 + 20 + DC to DC C4 C3 + 2 C1 + Converter GND 19 + C1+ 3 VCC C4 - 18 C2 4 C1 - V 17 - 10 V +5V 5 16 DCON RTS SS 6 300 7 WR RD C/D RESET CPU Control IC Communication cable RxD Control Line Driver/Receiver Control IC CPU CS Data Line Driver/Receiver A typical application for PC to modem communication or PC to PC communication is shown below. 8 9 CTS 300 10 5.5 k 5.5 k 15 TxD 14 RTS 13 RxD 12 CTS 11 VCC CLK TxC RxC GND The application circuits and their parameters are for reference only and are not intended for use in actual design-ins. 34 User's Manual S13354EJ3V0UM 11. REVISION HISTORY OF PRODUCTS The revision history of the PD471X Series is shown below. Current part numbers are equivalent to discontinued part numbers on package, pin configurations, and characteristics. Therefore, customers who have been using discontinued part numbers of the PD471X Series can use current products without modification of board circuits etc. However, operation checks for actual applications are necessary, because actual characteristics may differ. Part Number Ordering Information (Discontinued) Ordering Information (Current) PD4711 PD4711 PD4711ACX/4711AGS PD4711B PD4712 PD4712 PD4712ACY/4712AGT PD4712BCY/4712BGT PD4712CCY/4712CGT PD4712DCY/4712DGT PD4713 PD4713CX/4713GT PD4713ACX/4713AGT PD4714 PD4714CY/4714GT PD4714ACY/4714AGT PD4715 PD4715CY/4715GT PD4715ACY/4715AGT Reason of Modification Process integration due to standardization of design. The revision history of the PD472X Series is shown below. Current products are designed so as to raise the driven output performance, and as a result, the MIN. capacitance value for external capacitors is smaller. This reduction in capacitor capacitance may enable reduction of the circuit set size. Part Number PD4721 Production Category (Previous Standard) Capacitance of External Capacitor Production Category (Current Standard) Capacitance of External Capacitor E 1.0 to 4.7 F P 0.33 to 4.7 F PD4722 1.0 to 4.7 F 0.47 to 4.7 F PD4723 1.0 to 4.7 F 0.33 to 4.7 F PD4724 1.0 to 4.7 F 0.33 to 4.7 F PD4725 - - E 1.0 to 4.7 F Reason of Modification Capacitance of external capacitors is lowered due to improvement of driver output capability. (No modification) The term "current product" as used here refers to products as of May 1998. User's Manual S13354EJ3V0UM 35 12. Q&A 12.1 Internal Circuit Functions Q. How is the DCON pin actually used? (PD471X Series) A. Idle state (No Transfer) is defined as Mark Level ("L" Output) in the RS-232 Standard. If driver input of the PD471X may be unstable even if it is in Normal Operation Mode (not Standby), it can be fixed to Idle state making driver output level at Mark Level, using the DCON pin. This function can prevent output of abnormal signal (such as mis-recognition of the signal as Start Bit). (Refer to 6.1.2 Driver output logic.) Q. How is the RCON pin actually used? (PD471X Series) A. The space level voltage range is specified from -25 V to -3 V and the mark level voltage range is specified from +3 V to +25 V in the RS-232 Standard. Therefore, strictly speaking, the logic level is undefined when the cable signal is 0 V. The input threshold voltage of the PD471X Series can be switched using the RCON pin. The product has an A Mode, whereby the threshold voltage is set in positive, and a B Mode, whereby the threshold voltage is set in negative in order to prevent erroneous operations even if a 0-V signal is input. If a signal with higher noise is input, a malfunction due to the smaller hysteresis width of A Mode occurs. In this case, B Mode must be used. However, if a DC signal is output in a case such as when a control signal is transferred, signals of TTL level (0 to +5 V) may be easily handled. In this case, set the threshold voltage to the A mode so that signals can be ;;;;;;; ;;;;;;; recognized. As described above, various signals can be flexibly handled by switching input threshold voltage depending on the purpose. The threshold voltage range is shown below. (Refer to 6.1.4 Receiver input threshold voltage.) Receiver input threshold voltage range A Mode B Mode 5V 0V -5V Shaded part indicates range of threshold voltage. Q. How is the EN pin actually used? (PD472X Series) A. The products of the PD472X Series (except for the PD4721) have a mode by which receiver input can be accepted even if it is in the Standby state. This function allows the device to use the Wake-up function, which enables operation by receiving signals from the cable. However, the receiver with the EN pin enabled has no hysteresis width in the Standby mode (the threshold voltage is typically 1.5 V). In this case, it is recommended to apply a filter circuit to prevent erroneous operation due to noise. (Refer to 6.2.3 Receiver output logic.) 36 User's Manual S13354EJ3V0UM 12.2 Characteristics of Boosting Circuit Q. Receiver input threshold voltage exceeds the rated value. A. VDD and VSS boosted by the internal DC/DC converter circuit are used for the receiver input threshold voltage. Therefore, the cause of abnormal receiver input threshold voltage may be erroneous operation of the DC/DC converter circuit. Refer to Q. Voltage not boosted in 12.2 Characteristics of Boosting Circuit for measures to address improper operation of the DC/DC converter circuit. Q. How long does it take for the DC/DC converter to switch? + - + - A. Switching time can be determined by measuring C1 , C1 , C4 , and C4 with an oscilloscope or other device. It is designed so that the switching time is approximately 5 s. However, the switching time is fairly changed depending on dispersions of internal Cs and Rs which determine the time constant. Dispersion of approximately half to double of the designed value should be taken into account. Q. Can any current be taken out from the boosted power pins (VDD and VSS)? A. The boosted power pins are voltage output pins with voltages internally boosted. They are used for driver output, setting of receiver input threshold voltage or others. Therefore, do not directly connect any loads to these pins. Just for reference, a typical characteristic when current is taken out from the VDD pin of the PD4721 is shown in the figure below. (Refer to 7. NOTES FOR USE.) A typical characteristic of VDD vs. Takeout Current when current is taken out from VDD (Conditions: TA = 25C, VCC = 3.3 V, C1 to C5 = 0.33 F, DOUT Full Load RL = 3 k) 8.20 8.15 8.10 VDD (V) 8.05 8.00 7.95 7.90 7.85 7.80 0 50 100 150 200 250 300 Current (A) User's Manual S13354EJ3V0UM 37 Q. Are there any problems if two ICs are used with one common capacitor? A. DC/DC converters in the PD471X Series and PD472X Series are not designed expecting that two circuits are used with one common capacitor. In addition, because switching timings of capacitors cannot be externally synchronized, expected boosting operation cannot be achieved. Always use one capacitor for a single IC. Q. Voltage not boosted. A. There are several causes. Refer to the following measures. 1. Noise is superposed on the power supply pin. Connect a bypass capacitor between VCC and GND for stabilizing. Locate the capacitor in the vicinity of the VCC pin to minimize the wiring length. 2. External voltage is applied to the driver output pin before the power is turned on. Internal DC/DC converter circuit may not boost the voltage, if other voltage is applied to the driver output pin from external circuit before the power is turned on. Even if a different voltage within the rated value range is applied to the driver output pins, there is no operational problem if the IC is in operation. However, for functionality purposes, this IC is not designed expecting that another voltage will be applied to the driver output pins from an external circuit. Therefore, ensure that any other voltage is not applied to driver output pins from an external circuit. 12.3 External Capacitors Q. What is the withstand voltage of external capacitors? A. As specified in the data sheet, the following capacitors with specified withstand voltages are recommended. Series Withstand Voltage of External Capacitor PD471X 16 V PD472X 20 V A maximum of 10 V is theoretically applied to an external capacitor as specified in the table in DC/DC converter block in Sections 6.1.1 and 6.2.1. However, since noise may be generated at switching, voltages with some margins (16 V or 20 V) are recommended. Q. What will happen if capacitors with polarity such as Tantalum capacitor are connected in reversed polarity? A. If a capacitor with polarity is connected in the opposite direction from the connection diagram, the capacitor may be shorted. Connect capacitors based on the connection diagram when connecting capacitors with polarity. If the capacitor is shorted, refer to the next item "Q. Is the IC damaged if the capacitor is shorted?" Q. Is the IC damaged if the capacitor is shorted? A. High current may flow between VDD and VCC or between VCC and GND if the capacitor is shorted. This high current may destroy the capacitor. Absolute maximum rating of the input current on each pin of the PD472X Series is specified as 20 mA. Therefore, excessive current over this value may destroy capacitors. 38 User's Manual S13354EJ3V0UM 12.4 Transfer Rate Q. Is the operation guaranteed when using a maximum transfer rate of 115 kbps? A. The maximum transfer rate of the PD471X Series and PD472X Series is specified as 20 kbps. Therefore, their operation is not guaranteed with a transfer rate over 20 kbps. The actual transfer rate depends on the driver output load (such as signal cable length). If they are used for applications with a lower load, such as when the cable length is extremely short, transfer with rate of over 20 kbps is potentially possible. For your reference, actually measured values of slew rate and driver output voltage vs. transfer rate are shown on the following pages. User's Manual S13354EJ3V0UM 39 : PD4722 Measured on Measuring conditions : TA = 25C, VCC = 3 V, C1 - C5 = 1F, RL = 3 k, with all drivers output Transfer rate - slew rate (at rising edge) 0 SR (-) (V/ s) -2 -4 2500 pF 1500 pF -6 500 pF 0 pF -8 - 10 - 12 10 100 1000 Transfer Rate (kbps) Transfer rate - slew rate (at falling edge) 12 SR (+) (V/ s) 10 2500 pF 8 1500 pF 6 500 pF 0 pF 4 2 0 10 100 Transfer Rate (kbps) 40 User's Manual S13354EJ3V0UM 1000 Transfer rate - driver output voltage (with output "H") 10 8 6 VOH (V) 2500 pF 1500 pF 500 pF 4 0 pF 2 0 10 100 1000 Transfer Rate (kbps) Transfer rate - driver output voltage (with output "L") 0 -2 2500 pF VOL (V) -4 1500 pF 500 pF -6 0 pF -8 - 10 10 100 1000 Transfer Rate (kbps) User's Manual S13354EJ3V0UM 41 12.5 Reliability Q. What is ESD withstand voltage? A. These series have passed the ESD (Electrostatic Discharge) test (MIL Method, ESD Test by EIAJ Method) defined by NEC Electronics. Confirm the measured values in the ESD test by obtaining the Result Report of Reliability Testing. Request it from Reliability and Quality Control Dept. through your NEC Electronics sales representative. Q. How are ESD protection circuits configured? A. A protection circuit for the driver output block can be configured with a combination of Zener diodes. A sample circuit for protection is shown below. VZ of the Zener diodes should be lower than the rated voltage of the driver output (25 V) and higher than the output voltage (up to 10 V). (Refer to 7. NOTES FOR USE.) Example of ESD Protection Circuit PD471X and PD472X DIN DOUT Zener diode Output voltage (10 V) < VZ < 25 V Q. What will happen if driver outputs of the transfer source and the transfer destination conflict with each other? A. Over current between outputs may flow depending on the status of their driver outputs. For example, if the output of source is "H" and the output of destination is "L", a high current flows from the source driver to the destination driver. In this case, the internal DC/DC converter may not be able to properly boost the voltage, and erroneous operation may result. Therefore, do not connect driver output pins to each other. 42 User's Manual S13354EJ3V0UM 12.6 Marking, Packages and Others Q. Give me information on current marking. A. The markings of the PD4714A and PD4722 (on May 1998) are shown below. DIP package (PD4714ACY: PD471X Series) JAPAN D4714AC Lot number SOP package (PD4714AGT: PD471X Series) JAPAN D4714A Pin 1 index Lot number Only PD4711BGX has different marking for part number. Part number: D4711BG SSOP package (PD4722GS-GJG: PD472X Series) JAPAN D4722GS Pin 1 index Lot number Only marking of product name of PD4721GX-GJG is different from others. Part number: D4721 User's Manual S13354EJ3V0UM 43 Q. Give me information on the packaged quantity in a magazine and a reel A. Refer to the SEMICONDUCTOR SELECTION GUIDE (X13769X) for details on magazines and reels. The packaged quantities of each part number and package type is shown in the table below. DIP package (magazine) Part Number Packaged Quantity PD4711BCX 18 PD4712CCY/DCY 13 PD4713ACX 15 PD4714ACY 13 PD4715ACY 13 SOP package (adhesive taping) Part Number Packaged Quantity PD4711BGS 1500 PD4712CGT/DGT PD4713AGT PD4714AGT PD4715AGT SOP package (embossed taping) Part Number Packaged Quantity Taping Specification PD4711BGS 2500 24 mm width tape PD4712CGT/DGT 1500 PD4713AGT PD4714AGT PD4715AGT SSOP package Part Number PD4721GS-GJG Packaged Quantity Taping Specification 2500 16 mm width tape PD4722GS-GJG PD4723GS-GJG PD4724GS-GJG PD4726GS-GJG 44 24 mm width tape User's Manual S13354EJ3V0UM APPENDIX ELECTRICAL SPECIFICATIONS The typical electrical specifications of the PD471X Series and PD472X Series are shown in the tables below. Refer to the relevant document for details. Appendix 1. Main Characteristics of PD471X Series (Ex.: PD4714A) Electrical specifications (common) (Unless otherwise specified, VCC = +5 V 10%, TA = -20 to +80C, C1 to C5 = 22 F) Parameter Symbol Condition MIN. TYP. MAX. Unit Circuit current ICC1 VCC = +5 V, No load, RIN pin open, (STBY pin open) 7.0 18.0 mA Circuit current ICC2 VCC = +5 V, RL = 3 k (DOUT), DIN = GND, RIN, ROUT pin open (STBY pin open) 23.0 40.0 mA 50 120 A Circuit current at standby ICC (Standby) Standby high level input voltage VIH (Standby) Standby low level input voltage VIL (Standby) VCC = +5 V, No load, RIN pin open (STBY pin high) 2.0 V 0.8 V Electrical specifications (driver) (Unless otherwise specified, VCC = +5 V 10%, TA = -20 to +80C, C1 to C5 = 22 F) Parameter Symbol Condition MIN. TYP. MAX. Unit 0.8 V Low-level input voltage VIL High-level input voltage VIH 2.0 Low-level input current IIL 0 -1.0 A High-level input current IIH 0 1.0 A Output voltage VDO VCC = +5.0 V, RL = , TA = 25C V 5.5 V VCC = +4.5 V, RL = 3 k 5.0 V ISC VCC = +5.0 V, from GND Slew rate SR CL = 10 pF, RL = 3 to 7 k CL = 2500 pF, RL = 3 to 7 k tPHL 9.7 VCC = +5.0 V, RL = 3 k Output short-circuit current Transfer delay time V 15 40 mA 1.5 9 30 V/s 1.5 5 30 V/s RL = 3 k, CL = 2500 pF 0.8 s 500 tPLH Output resistance RO VCC = VDD = VSS = 0 V, VOUT = 2 V Standby output transition time tDAZ RL = 3 k, CL = 2500 pF 4 10 s Standby output transition time tDZA RL = 3 k, CL = 2500 pF 25 50 ms User's Manual S13354EJ3V0UM 300 45 Electrical specifications (receiver) (Unless otherwise specified, VCC = +5 V 10%, TA = -20 to +80C, C1 to C5 = 22 F) Parameter Symbol Condition Low-level output voltage VOL IOUT = 4 mA High-level output voltage VOH IOUT = -4 mA Low-level input voltage VOL RCON pin High-level input voltage VOH RCON pin Propagation delay time tPHL RL = 1 k, CL = 150 pF MIN. TYP. MAX. Unit 0.4 V V VCC - 0.8 0.8 2.0 V V s 0.13 tPLH Input resistance RI Input open circuit voltage VIO Input threshold A mode only. Threshold A mode (RCON pin Low) VIH VCC = +5 V 1.7 VIL VCC = +5 V VH Threshold B mode (RCON pin High) 3 5 7 k 0.5 V 2.3 2.7 V 0.7 1.1 1.7 V VCC = +5 V (Hysteresis width) 0.5 1.2 1.8 V VIH VCC = +5 V 1.6 2.2 2.6 V VIL VCC = +5 V -0.4 -1.8 -3.0 V VH VCC = +5 V (Hysteresis width) 2.6 4.0 5.4 V Standby output transition time tDAZ 0.4 1 s Standby output transition time tDZA 1.0 10 ms 46 User's Manual S13354EJ3V0UM Appendix 2. Main Characteristics of PD472X Series (Ex.: PD4724) Electrical specifications (common) (Unless otherwise specified, TA = -40 to +85C, C1 to C5 = 1 F) Parameter Circuit current Circuit current Circuit current at standby (Standby mode 1) Circuit current at standby (Standby mode 2) Symbol ICC1 ICC2 ICC3 ICC4 Condition TYP. MAX. Unit VCC = +3.3 V, No load, RIN pin open, STBY = H 7.5 15 mA VCC = +5.0 V, No load, RIN pin open, STBY = H 5.5 11 mA VCC = +3.3 V, RL = 3 k (DOUT), DIN = GND, RIN, ROUT pin open, STBY = H 25 35 mA VCC = +5.0 V, RL = 3 k (DOUT), DIN = GND, RIN, ROUT pin open, STBY = H 19 28 mA VCC = +3.3 V, No load, DIN, RIN pin open STBY = L, EN = L, TA = 25C 1 3 A VCC = +5.0 V, No load, DIN, RIN pin open STBY = L, EN = L, TA = 25C 2 5 A VCC = +3.3 V, No load, DIN, RIN pin open STBY = L, EN = H, TA = 25C 1 3 A VCC = +5.0 V, No load, DIN, RIN pin open STBY = L, EN = H, TA = 25C 2 5 A High-level input voltage VIH VCC = +3.0 to +5.5 V, STBY, VCHA, EN pin Low-level input voltage VIL VCC = +3.0 to +5.5 V, STBY, VCHA, EN pin MIN. 2.4 V 0.6 V MAX. Unit 0.8 V Electrical specifications (driver) (Unless otherwise specified, TA = -40 to +85C, C1 to C5 = 1 F) 3-V mode (Unless otherwise specified, VCHA = H, VCC = 3.0 to 3.6 V) Parameter Symbol Condition MIN. TYP. Low-level input voltage VIL High-level input voltage VIH Low-level input current IIL VCC = +3.6 V, VI = 0 V -25 A High-level input current IIH VCC = +3.6 V, VI = +3.6 V 1.0 A Output voltage VDO 2.0 VCC = +3.3 V, RL = , TA = 25C VCC = +3.3 V, RL = 3 k 5.0 VCC = +3.0 V, RL = 3 k, TA = 25C 5.0 Output short-circuit current ISC VCC = +3.3 V, from GND Slew rate SR CL = 10 pF, RL = 3 to 7 k CL = 2500 pF, RL = 3 to 7 k Transfer delay time tPHL V 9.5 V 6.0 V V 40 mA 3.0 30 V/s 3.0 30 V/s RL = 3 k, CL = 2500 pF s 2.5 tPLH Output resistance RO VCC = VDD = VSS = 0 V, VOUT = 2 V Standby output transition time tDAZ RL = 3 k, CL = 2500 pF 4 10 s Standby output transition time tDZA RL = 3 k, CL = 2500 pF 1 3 ms Power on output transition time tPRA RL = 3 k, CL = 2500 pF 1 3 ms User's Manual S13354EJ3V0UM 300 47 Electrical specifications (driver) (Unless otherwise specified, TA = -40 to +85C, C1 to C5 = 1 F) 5-V mode (Unless otherwise specified, VCHA = L, VCC = 5.0 V 10%) Parameter Symbol Condition MIN. TYP. MAX. Unit 0.8 V Low-level input voltage VIL High-level input voltage VIH Low-level input current IIL VCC = +5.5 V, VI = 0 V -40 A High-level input current IIH VCC = +5.5 V, VI = +5.5 V 1.0 A Output voltage VDO Output short-circuit current ISC Slew rate SR Transfer delay time tPHL 2.0 VCC = +5.0 V, RL = , TA = 25C V 9.7 V VCC = +5.0 V, RL = 3 k 6.0 V VCC = +4.5 V, RL = 3 k 5.0 V 40 VCC = +5.0 V, from GND mA CL = 10 pF, RL = 3 to 7 k 4.0 30 V/s CL = 2500 pF, RL = 3 to 7 k 4.0 30 V/s RL = 3 k, CL = 2500 pF s 2 tPLH Output resistance RO VCC = VDD = VSS = 0 V, VOUT = 2 V Standby output transition time tDAZ RL = 3 k, CL = 2500 pF 4 10 s Standby output transition time tDZA RL = 3 k, CL = 2500 pF 0.5 1 ms Power on output transition time tPRA RL = 3 k, CL = 2500 pF 0.5 1 ms 300 Electrical specifications (receiver) (Unless otherwise specified, VCC = 3.0 to 5.5 V, TA = -40 to +85C, C1 to C5 = 1 F) Parameter Symbol Condition MIN. TYP. MAX. Unit 0.4 V Low level-output voltage VOL1 IOUT = 4 mA, STBY = H High level-output voltage VOH1 IOUT = -4 mA, STBY = H Low level-output voltage VOL2 IOUT = 4 mA, STBY = L High level-output voltage VOH2 IOUT = -4 mA, STBY = L Transfer delay time tPHL RIN ROUT, CL = 150 pF, VCC = +3.0 V 0.2 s RIN ROUT, CL = 150 pF, VCC = +3.0 V 0.1 s RIN ROUT, CL = 150 pF, VCC = +3.0 V 100 (STBY = H) tPLH Transfer delay time tPHL (STBY = L) tPLH Transfer delay time tPHA (STBY = L) tPAH V VCC - 0.4 0.5 V VCC - 0.5 Input resistance RI Input open circuit voltage VIO 3 Threshold VIH VCC = +3.0 to +5.5 V 1.7 (STBY = H) VIL VCC = +3.0 to +5.5 V 0.7 VH VCC = +3.0 to +5.5 V (Hysteresis width) Threshold VIH VCC = +3.0 to +5.5 V, RIN4, RIN5 (STBY = L, EN = H) VIL VCC = +3.0 to +5.5 V, RIN4, RIN5 Standby output transition tDAH V 5.5 300 ns 7 k 0.5 V 2.3 2.7 V 1.1 1.7 V 0.5 1.2 1.8 2.7 1.5 V V 1.5 0.7 V 0.2 3 s VCHA = H (3-V mode) 0.6 3 ms VCHA = L (5-V mode) 0.3 1 ms VCHA = H (3-V mode) 1 3 ms VCHA = L (5-V mode) 0.5 1 ms time Standby output transition tDHA time Power on reset release time 48 tPRA User's Manual S13354EJ3V0UM