HD74AC138/HD74ACT138 1-of-8 Decoder/Demultiplexer ADE-205-368 (Z) 1st. Edition Sep. 2000 Description The HD74AC138/HD74ACT138 is a high-speed 1-of-8 decoder/demultiplexer. This device is ideally suited for high-speed bipolar memory chip select address decoding. The multiple input enables allow parallel expansion to a 1-of-24 decoder using just three HD74AC138/HD74ACT138 devices or a 1-of-32 decoder using four HD74AC138/HD74ACT138 devices and one inverter. Features * * * * * Demultiplexing Capability Multiple Input Enable for Easy Expansion Active LOW Mutually Exclusive Outputs Outputs Source/Sink 24 mA HD74ACT138 has TTL-Compatible Inputs HD74AC138/HD74ACT138 Pin Arrangement A0 1 16 VCC A1 2 15 O0 A2 3 14 O1 E1 4 13 O2 E2 5 12 O3 E3 6 11 O4 O7 7 10 O5 GND 8 9 O6 (Top view) Logic Symbol A0 A1 A2 E1 E2 E3 O0 O1 O2 O3 O4 O5 O6 O7 Pin Names A0 to A2 E1 to E 2 E3 O0 to O 7 2 Address Inputs Enable Inputs Enable Input Outputs HD74AC138/HD74ACT138 Functional Description The HD74AC138/HD74ACT138 high-speed 1-of-8 decoder/demultiplexer accepts three binary weighted inputs (A0, A1, A2) and, when enabled, provides eight mutually exclusive active-LOW outputs (O0 to O7). The HD74AC138/HD74ACT138 features three Enable inputs, two active-Low (E1, E2) and one active-High (E3). All outputs will be High unless E1 and E2 are Low and E 3 is High. This multiple enabled function allows easy parallel expansion of the device to a 1-of-32 (5 lines to 32 lines) decoder with just four HD74AC138/HD74ACT138 devices and one inverter (See Figure a). The HD74AC138/HD74ACT138 can be used as an 8-output demultiplexer by using one of the active Low Enable inputs as the data input and the other Enable inputs as strobes. The Enables inputs which are not used must be permanently tied to their appropriate active-High or active-Low state. Truth Table Inputs Outputs E1 E2 E3 A0 A1 A2 O0 O1 O2 O3 O4 O5 O6 O7 H X X X X X H H H H H H H H X H X X X X H H H H H H H H X X L X X X H H H H H H H H L L H L L L L H H H H H H H L L H H L L H L H H H H H H L L H L H L H H L H H H H H L L H H H L H H H L H H H H L L H L L H H H H H L H H H L L H H L H H H H H H L H H L L H L H H H H H H H H L H L L H H H H H H H H H H H L H : L : X : High Voltage Level Low Voltage Level Immaterial 3 HD74AC138/HD74ACT138 Logic Diagram A2 O7 A1 E1 E2 E3 A0 O6 O5 O4 O3 O2 O1 O0 Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays. Figure a: Expansion of 1-of-32 Decoding A0 A1 A2 '04 A3 A4 H 123 A0 A1 A2 E O0 O1 O2 O3 O4 O5 O6 O7 O0 4 123 123 A0 A1 A2 E O0 O1 O2 O3 O4 O5 O6 O7 A0 A1 A2 E O0 O1 O2 O3 O4 O5 O6 O7 123 A0 A1 A2 E O0 O1 O2 O3 O4 O5 O6 O7 O31 HD74AC138/HD74ACT138 DC Characteristics (unless otherwise specified) Item Symbol Max Unit Condition Maximum quiescent supply current I CC 80 A VIN = VCC or ground, VCC = 5.5 V, Ta = Worst case Maximum quiescent supply current I CC 8.0 A VIN = VCC or ground, VCC = 5.5 V, Ta = 25C Maximum ICC/input (HD74ACT138) I CCT 1.5 mA VIN = VCC - 2.1 V, VCC = 5.5 V Ta = Worst case AC Characteristics: HD74AC138 Ta = +25C CL = 50 pF Ta = -40C to +85C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay t PLH 3.3 1.0 8.5 13.0 1.0 15.0 ns 5.0 1.0 6.5 9.5 1.0 10.5 3.3 1.0 8.0 12.5 1.0 14.0 5.0 1.0 6.0 9.0 1.0 10.5 3.3 1.0 11.0 15.0 1.0 16.0 5.0 1.0 8.0 11.0 1.0 12.0 3.3 1.0 9.5 13.5 1.0 15.0 5.0 1.0 7.0 9.5 1.0 10.5 3.3 1.0 11.0 15.5 1.0 16.5 5.0 1.0 8.0 11.0 1.0 12.5 3.3 1.0 8.5 13.0 1.0 14.0 5.0 1.0 6.0 8.0 1.0 9.5 An to On Propagation delay t PHL An to On Propagation delay t PLH E1 or E 2 to On Propagation delay t PHL E1 or E 2 to On Propagation delay t PLH E3 to On Propagation delay E3 to On Note: t PHL ns ns ns ns ns 1. Voltage Range 3.3 is 3.3 V 0.3 V Voltage Range 5.0 is 5.0 V 0.5 V 5 HD74AC138/HD74ACT138 AC Characteristics: HD74ACT138 Ta = +25C CL = 50 pF Ta = -40C to +85C CL = 50 pF Item Symbol VCC (V)*1 Min Typ Max Min Max Unit Propagation delay An to On t PLH 5.0 1.0 7.0 10.5 1.0 11.5 ns Propagation delay An to On t PHL 5.0 1.0 6.5 10.5 1.0 11.5 ns Propagation delay E1 or E 2 to On t PLH 5.0 1.0 8.0 11.5 1.0 12.5 ns Propagation delay E1 or E 2 to On t PHL 5.0 1.0 7.5 11.5 1.0 12.5 ns Propagation delay E3 to On t PLH 5.0 1.0 8.0 12.0 1.0 13.0 ns Propagation delay E3 to On t PHL 5.0 1.0 6.5 10.5 1.0 11.5 ns Note: 1. Voltage Range 5.0 is 5.0 V 0.5 V Capacitance Item Symbol Typ Unit Condition Input capacitance CIN 4.5 pF VCC = 5.5 V Power dissipation capacitance CPD 60.0 pF VCC = 5.0 V 6 HD74AC138/HD74ACT138 Package Dimensions Unit: mm 19.20 20.00 Max 6.30 9 1 7.40 Max 16 8 1.3 0.48 0.10 7.62 2.54 Min 5.06 Max 2.54 0.25 0.51 Min 1.11 Max + 0.13 0.25 - 0.05 0 - 15 Hitachi Code JEDEC EIAJ Mass (reference value) DP-16 Conforms Conforms 1.07 g Unit: mm 10.06 10.5 Max 9 1 8 1.27 *0.42 0.08 0.40 0.06 0.10 0.10 0.80 Max *0.22 0.05 0.20 0.04 2.20 Max 5.5 16 0.20 7.80 +- 0.30 1.15 0 - 8 0.70 0.20 0.15 0.12 M *Dimension including the plating thickness Base material dimension Hitachi Code JEDEC EIAJ Mass (reference value) FP-16DA -- Conforms 0.24 g 7 HD74AC138/HD74ACT138 Unit: mm 9.9 10.3 Max 9 1 8 *0.42 0.08 0.40 0.06 *0.22 0.03 0.20 0.03 0.635 Max + 0.11 1.27 0.14 - 0.04 1.75 Max 3.95 16 + 0.10 6.10 - 0.30 1.08 0 - 8 0.67 0.60 +- 0.20 0.15 0.25 M Hitachi Code JEDEC EIAJ Mass (reference value) *Dimension including the plating thickness Base material dimension FP-16DN Conforms Conforms 0.15 g Unit: mm 4.40 5.00 5.30 Max 16 9 1 8 0.65 1.10 Max 0.65 Max 0.10 *Dimension including the plating thickness Base material dimension 8 6.40 0.20 0.07 +0.03 -0.04 0.20 0.06 1.0 0.13 M *0.17 0.05 0.15 0.04 0.08 *0.22 +- 0.07 0 - 8 0.50 0.10 Hitachi Code JEDEC EIAJ Mass (reference value) TTP-16DA -- -- 0.05 g HD74AC138/HD74ACT138 Cautions 1. Hitachi neither warrants nor grants licenses of any rights of Hitachi's or any third party's patent, copyright, trademark, or other intellectual property rights for information contained in this document. Hitachi bears no responsibility for problems that may arise with third party's rights, including intellectual property rights, in connection with use of the information contained in this document. 2. Products and product specifications may be subject to change without notice. Confirm that you have received the latest product standards or specifications before final design, purchase or use. 3. Hitachi makes every attempt to ensure that its products are of high quality and reliability. However, contact Hitachi's sales office before using the product in an application that demands especially high quality and reliability or where its failure or malfunction may directly threaten human life or cause risk of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation, traffic, safety equipment or medical equipment for life support. 4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly for maximum rating, operating supply voltage range, heat radiation characteristics, installation conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other consequential damage due to operation of the Hitachi product. 5. This product is not designed to be radiation resistant. 6. No one is permitted to reproduce or duplicate, in any form, the whole or part of this document without written approval from Hitachi. 7. Contact Hitachi's sales office for any questions regarding this document or Hitachi semiconductor products. Hitachi, Ltd. Semiconductor & Integrated Circuits. Nippon Bldg., 2-6-2, Ohte-machi, Chiyoda-ku, Tokyo 100-0004, Japan Tel: Tokyo (03) 3270-2111 Fax: (03) 3270-5109 URL NorthAmerica Europe Asia Japan : : : : http://semiconductor.hitachi.com/ http://www.hitachi-eu.com/hel/ecg http://sicapac.hitachi-asia.com http://www.hitachi.co.jp/Sicd/indx.htm For further information write to: Hitachi Semiconductor (America) Inc. 179 East Tasman Drive, San Jose,CA 95134 Tel: <1> (408) 433-1990 Fax: <1>(408) 433-0223 Hitachi Europe GmbH Electronic Components Group Dornacher Strae 3 D-85622 Feldkirchen, Munich Germany Tel: <49> (89) 9 9180-0 Fax: <49> (89) 9 29 30 00 Hitachi Asia Ltd. Hitachi Tower 16 Collyer Quay #20-00, Singapore 049318 Tel : <65>-538-6533/538-8577 Fax : <65>-538-6933/538-3877 URL : http://www.hitachi.com.sg Hitachi Europe Ltd. Electronic Components Group. Whitebrook Park Lower Cookham Road Maidenhead Berkshire SL6 8YA, United Kingdom Tel: <44> (1628) 585000 Fax: <44> (1628) 585160 Hitachi Asia Ltd. (Taipei Branch Office) 4/F, No. 167, Tun Hwa North Road, Hung-Kuo Building, Taipei (105), Taiwan Tel : <886>-(2)-2718-3666 Fax : <886>-(2)-2718-8180 Telex : 23222 HAS-TP URL : http://www.hitachi.com.tw Hitachi Asia (Hong Kong) Ltd. Group III (Electronic Components) 7/F., North Tower, World Finance Centre, Harbour City, Canton Road Tsim Sha Tsui, Kowloon, Hong Kong Tel : <852>-(2)-735-9218 Fax : <852>-(2)-730-0281 URL : http://www.hitachi.com.hk Copyright Hitachi, Ltd., 2000. All rights reserved. Printed in Japan. Colophon 2.0 9