Datasheet AS1153, AS11 57 D u a l LVD S R e c e i v e r 1 General Description 2 Key Features The AS1153, AS1157 are dual flow-through LVDS (low-voltage differential signaling) receivers which accept LVDS differential inputs and convert them to LVCMOS outputs. The receivers are perfect for lowpower low-noise applications requiring high signaling rates and reduced EMI emissions. Flow-Through Pinout The devices are guaranteed to receive data at speeds up to 260Mbps (130MHz) over controlled impedance media of approximately 100. Supported transmission media are PCB traces, backplanes, and cables. Single +3.3V Supply The AS1153, AS1157 features integrated parallel termination resistors (nominally 107), which eliminate the requirement for discrete termination resistors, and reduce stub lengths. The AS1153, AS1157 uses high impedance inputs and requires an external termination resistor when used in a point-to-point connection. Integrated Termination (AS1157) Guaranteed 260Mbps Data Rate 300ps Pulse Skew (Max) Conform to ANSI TIA/EIA-644 LVDS Standards Operating Temperature Range: -40C to +85C Failsafe Circuit 8-pin SOIC Package The integrated Failsafe feature sets the output high if the inputs are open, undriven and terminated, or undriven and shorted. All inputs conform to the ANSI TIA/EIA- 644 LVDS standards. Flowthrough pinout simplifies PC board layout and reduces crosstalk by separating the LVDS inputs and LVCMOS outputs. The devices are available in a 8-pin SOIC package. 3 Applications Digital Copiers, Laser Printers, Cellular Phone Base Stations, Add/ Drop Muxes, Digital Cross-Connects, DSLAMs, Network Switches/ Routers, Backplane Interconnect, Clock Distribution Computers, Intelligent Instruments, Controllers, Critical Microprocessors and Microcontrollers, Power Monitoring, and Portable/Battery-Powered Equipment. Figure 1. AS1153, AS1157 - Block Diagram IN1- VCC IN1+ OUT1 AS1153/57 IN2+ OUT2 IN2- GND www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 1 - 16 AS1153, AS1157 Datasheet - P i n o u t a n d P a c k a g i n g 4 Pinout and Packaging Pin Assignments Figure 2. Pin Assignments (Top View) IN1- 8 VCC 7 OUT1 IN2+ 3 6 OUT2 IN2- 5 GND 1 IN1+ 2 AS1153/57 4 Pin Descriptions Table 1. Pin Descriptions Pin Number Pin Name 1 IN1- Inverting Differential Receiver Input Description 2 IN1+ Noninverting Differential Receiver Input 3 IN2+ Noninverting Differential Receiver Input 4 IN2- Inverting Differential Receiver Input 5 GND Ground 6 OUT2 LVCMOS/LVTTL Receiver Output 7 OUT1 LVCMOS/LVTTL Receiver Output 8 VCC Power-Supply Input. Bypass VCC to GND with 0.1F and 0.001F ceramic capacitors. www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 2 - 16 AS1153, AS1157 Datasheet - A b s o l u t e M a x i m u m R a t i n g s 5 Absolute Maximum Ratings Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter Min Max Units Comments Electrical Parameters VCC to GND -0.3 5.0 V INx+, INx- to GND -0.3 5.0 V OUTx+, OUTx- to GND -0.3 Vcc + 0.3 V Electrostatic Discharge Electrostatic Discharge HBM +/- 4 kV Norm: MIL 883 E method 3015, INx+, INxTypical 4-layer application Temperature Ranges and Storage Conditions Thermal Resistance JA 128 C/W Junction Temperature +150 C +125 C Storage Temperature Range -55 Package Body Temperature Humidity non-condensing Moisture Sensitive Level www.austriamicrosystems.com/Interfaces-LVDS/AS1153 5 +260 C 85 % 1 The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/ JEDEC J-STD-020"Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". The lead finish for Pb-free leaded packages is matte tin (100% Sn). Represents a max. floor life time of unlimited Revision 1.02 3 - 16 AS1153, AS1157 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s 6 Electrical Characteristics DC Electrical Characteristics VCC = +3.0 to +3.6V, Differential Input Voltage |VID| = +0.1 to +1.0V, Common-Mode Voltage VCM = |VID/2| to 2.4V - |VID/2|,TAMB = -40C to +85C. Typical values are at VCC = +3.3V, TAMB = +25C (unless otherwise specified). Table 3. DC Electrical Characteristics Parameter Symbol Operating Temperature Range TAMB Conditions Min Typ -40 Max Unit +85 C 100 mV LVDS Inputs (INx+, INx-) Differential Input High Threshold VTH Differential Input Low Threshold VTL Input Current (AS1153) 1 -100 0.1V |VID| 0.6V -20 20 A 0.6V |VID| 1.0V -25 25 A RDIFF VCC = 3.6V or 0, Figure 18 on page 9 90 107 132 2 VCC = 3.6V or 0, Figure 18 on page 9 40 100 2.7 3.2 IINx+, IINx- Differential Input Resistance (AS1157) Differential Input Resistance (AS1153) mV RDIFF k LVCMOS/LVTTL Outputs (OUTx) IOH = -4.0mA Output High Voltage (Table 5) (AS1153) VOH IOH = -4.0mA (AS1157) Open, undriven short, or undriven 100 parallel termination VID = +100mV 2.7 3.2 Open or undriven short 2.7 3.2 VID = +100mV 2.7 3.2 Output Low Voltage VOL IOL = +4.0mA, VID = -100mV Output Short-Circuit 3 Current IOS VID = 100mV, VOUTx = 0 0.1 V 0.25 15 V mA Supply Supply Current ICC Inputs open 0.6 2 mA |VID| = 200mV 4.5 8 mA 1. Current into a pin is defined as positive. Current out of a pin is defined as negative. All voltages are referenced to ground except VTH, VTL, and VID. 2. 2xRIN = RDIFF 3. Short only one output at a time. Do not exceed the absolute maximum junction temperature specification. Note: All limits are guaranteed. The parameters with min and max values are guaranteed with production tests or SQC (Statistical Quality Control) methods. www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 4 - 16 AS1153, AS1157 Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s AC Electrical Characteristics VCC = +3.0 to +3.6V, CLOAD = 10pF, Differential Input Voltage |VID| = 0.2 to 1.0V, Common-Mode Voltage VCM = |VID/2| to 2.4V -|VID/2|, Input Rise and Fall Time = 1ns (20 to 80%), Input Frequency = 100MHz, TAMB = -40 to +85C. Typical values are at VCC = +3.3V, VCM = 1.2V, |VID| = 0.2V, TAMB = +25C (unless otherwise specified). Table 4. AC Electrical Characteristics 1, 2 Parameter Symbol Conditions Min Typ Max Unit Differential Propagation Delay High-to-Low tPHLD Figure 20 on page 11 and Figure 21 on page 12 1 1.8 3.1 ns Differential Propagation Delay Low-to-High tPLHD Figure 20 on page 11 and Figure 21 on page 12 1 1.8 3.1 ns tSKD1 Figure 20 on page 11 and Figure 21 on page 12 250 600 ps tSKD2 Figure 20 on page 11 and Figure 21 on page 12 600 ps 5 tSKD3 Figure 20 on page 11 and Figure 21 on page 12 0.8 ns 6 tSKD4 Figure 20 on page 11 and Figure 21 on page 12 1.5 ns Rise Time tTLH Figure 20 on page 11 and Figure 21 on page 12 0.4 1.0 ns Fall Time tTHL Figure 20 on page 11 and Figure 21 on page 12 0.4 1.0 ns fMAX All Channels Switching Differential Pulse Skew (tPHLD - tPLHD) 3 Differential Channel-to-Channel Skew Differential Part-to-Part Skew Differential Part-to-Part Skew Maximum Operating Frequency 7, 8 4 130 160 MHz Notes: 1. 2. 3. 4. 5. AC parameters are guaranteed by design and characterization. CL includes scope probe and test jig capacitance. tSKD1 is the magnitude difference of differential propagation delays in a channel. tSKD1 = |tPHLD - tPLHD|. tSKD2 is the magnitude difference of the tPLHD or tPHLD of one channel and the tPLHD or tPHLD of any other channel on the same device. tSKD3 is the magnitude difference of any differential propagation delays between devices operating over rated conditions at the same VCC and within 5C of each other. 6. tSKD4 is the magnitude difference of any differential propagation delays between devices operating over rated conditions. 7. fMAX generator output conditions: a. Rise time = fall time = 1ns (0 to 100%) b. 50% duty cycle c. VOH = +1.3V d. VOL = +1.1V 8. Output criteria: a. Duty cycle = 60% to 40% b. VOL = 0.4V (max) c. VOH = 2.7V (min) d. Load = 10pF www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 5 - 16 AS1153, AS1157 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s 7 Typical Operating Characteristics VCC = +3.3V, VCM = +1.2V, |VID| = 0.2V, CLOAD = 10pF, TAMB = +25C, unless otherwise noted. Figure 3. Supply Current vs. Frequency Figure 4. Supply Current vs. Temperature 20 . 40 Supply Current (mA) Supply Current (mA) . 50 All Channels Switching 30 20 One Channel Switching 10 50 100 150 200 250 10 f = 1MHz 5 0 -45 -30 -15 0 0 f = 100MHz 15 300 Differential Output Voltage (mV) 45 60 75 90 120 30 High to Low VTH 100 25 80 20 15 60 VTL Low to High 40 10 20 5 0 3 3.1 3.2 3.3 3.4 3.5 0 3 3.6 3.1 3.2 3.3 3.4 3.5 3.6 3.5 3.6 Supply Voltage(V) Supply Voltage (V) Figure 7. Output Low Voltage vs. VCC Figure 8. Output High Voltage vs. VCC 3.2 75 74,5 Output Voltage (V) . . 15 30 Figure 6. Output Short-Circuit Current vs. VCC Output Short Circuit Current (mA) . . Figure 5. Diff. Threshold Voltage vs. VCC Output Voltage (mV) 0 Temperature(C) Frequency (MHz) 74 73,5 73 72,5 3.1 3 2.9 2.8 2.7 72 3 3,1 3,2 3,3 3,4 3,5 3 3,6 www.austriamicrosystems.com/Interfaces-LVDS/AS1153 3.1 3.2 3.3 3.4 Supply Voltage (V) Supply Voltage (V) Revision 1.02 6 - 16 AS1153, AS1157 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 9. Differential Propagation Delay vs. VCC Figure 10. Differential Propagation Delay vs. Temp. 1.94 . 1.9 Diff. Propagation Delay (ns) Diff. Propagation Delay (ns) . 2.05 tPHLD 1.86 1.82 1.78 tPLHD 1.74 1.7 3 3.1 3.2 3.3 3.4 3.5 2 1.95 1.9 tPLHD 1.85 tPHLD 1.8 1.75 -45 -30 -15 0 3.6 Supply Voltage(V) Figure 11. Differential Propagation Delay vs. VCM Figure 12. Differential Propagation Delay vs. VID 2.25 . . 2 1.95 Diff. Propagation Delay (ns) Diff. Propagation Delay (ns) 15 30 45 60 75 90 Temperature(C) 1.9 tPHLD 1.85 1.8 1.75 tPLHD 1.7 2 tPHLD 1.75 tPLHD 1.5 1.25 1 0.75 1.65 0 0.5 1 1.5 2 0.1 2.5 0.5 0.9 1.3 1.7 2.1 2.5 Differential-Input Voltage(V) Common-Mode Voltage(V) Figure 13. Differential Propagation Delay vs. Load Diff. Propagation Delay (ns) . 3 2.5 tPHLD 2 tPLHD 1.5 1 0.5 0 10 15 20 25 30 35 40 45 50 Capacitive Load (pF) www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 7 - 16 AS1153, AS1157 Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s Figure 14. Differential Pulse Skew vs. VCC Figure 15. Transition Time vs. Capacitive Load 1600 250 1400 . Transition Time (ps) Differential Pulse Skew (ps) . 300 200 150 100 50 tTHL 1200 800 600 400 0 3 3.1 3.2 3.3 3.4 3.5 10 3.6 Figure 16. Transition Time vs. VCC 20 25 30 35 40 45 50 Figure 17. Transition Time vs. Temperature 475 400 . 390 Transition Time (ps) . 15 Capacitive Load (pF) Supply Voltage(V) Transition Time (ps) tTLH 1000 380 tTHL 370 tTLH 360 350 450 tTHL 425 tTLH 400 375 350 325 340 3 3.1 3.2 3.3 3.4 3.5 3.6 300 -45 -30 -15 0 www.austriamicrosystems.com/Interfaces-LVDS/AS1153 15 30 45 60 75 90 Temperature(C) Supply Voltage(V) Revision 1.02 8 - 16 AS1153, AS1157 Datasheet - D e t a i l e d D e s c r i p t i o n 8 Detailed Description The AS1153, AS1157 are 260Mbps, dual-channel LVDS receivers intended for high-speed, point-to-point, low-power applications. Each independent channel accepts and converts an LVDS input to an LVTTL/LVCMOS output. The devices are capable of detecting differential signals from 100mV to 1V within an input voltage range of 0 to 2.4V. The 250 to 450mV differential output of an LVDS driver is nominally centered around 1.25V. Due to the receiver input voltage range, a 1V voltage shift in the signal relative to the receiver is allowed. Thus, a difference in ground references of the transmitter and the receiver, as well as the common mode effect of coupled noise, can be tolerated. LVDS Interface The LVDS Interface Standard is a signaling method defined for point-to-point communication over a controlled-impedance medium as defined by the ANSI TIA/EIA-644 and IEEE 1596.3 standards. The LVDS standard uses a lower voltage swing than other common communication standards, resulting in higher data rates, reduced power consumption and EMI emissions, and less susceptibility to noise. The devices fully comply with the LVDS standard input voltage range of 0 to +2.4V referenced to receiver ground. The AS1157 has an integrated termination resistors connected internally across each receiver input. This internal termination saves board space, eases layout, and reduces stub length compared to an external termination resistor. In other words, the transmission line is terminated on the IC. Failsafe Circuit The devices contain an integrated Failsafe circuit to prevent noise at inputs that are open, undriven and terminated, or undriven and shorted. Open or undriven terminated input conditions can occur if there is a cable failure or when the LVDS driver outputs are high impedance. A short condition also can occur because of a cable failure. The Failsafe circuit of the AS1153, AS1157 automatically sets the output high if any of these conditions are true. The Failsafe input circuit (see Figure 18) samples the input common-mode voltage and compares it to VCC - 0.3V (nominal). If the input is driven to levels specified in the LVDS standards, the input common-mode voltage is less than VCC - 0.3V and the Failsafe circuit is not activated. If the inputs are open, undriven and shorted, or undriven and parallel terminated, there is no input current. In this case, a pullup resistor in the Failsafe circuit pulls both inputs above VCC - 0.3V, activating the Failsafe circuit and thus forcing the device output high. Figure 18. Failsafe Input Circuit VCC VCC RIN2 RIN2 VCC - 0.3V VCC - 0.3V INx+ INx+ RIN1 RIN1 RDIFF OUTx RIN1 OUTx RIN1 INx- INx- AS1153 www.austriamicrosystems.com/Interfaces-LVDS/AS1153 AS1157 Revision 1.02 9 - 16 AS1153, AS1157 Datasheet - A p p l i c a t i o n s 9 Applications Table 5. Function Table Input INx+ Output INx- OUTx VID +100mV H VID +100mV L AS1153 - Open, undriven short, or undriven 100 parallel termination H AS1157 - Open or undriven short Figure 19. Typical Application Circuit +3.3V +3.3V 0.001F 0.001F 0.1F 0.1F LVDS Signals LVTTL/LVCMOS Data Inputs Tx 107 Rx LVTTL/LVCMOS Data Outputs AS1157 AS1154 LVDS Receiver 100 Shielded Twisted Cable or Microstrip PC Board Traces Power-Supply Bypassing To bypass VCC, use high-frequency surface-mount ceramic 0.1F and 0.001F capacitors in parallel as close to the device as possible, with the smaller valued capacitor closest to pin VCC. Differential Traces Input trace characteristics can adversely affect the performance of the AS1153, AS1157. Use controlled-impedance PC board traces to match the cable characteristic impedance. The termination resistor must also be matched to this characteristic impedance. Eliminate reflections and ensure that noise couples as common mode by running differential traces close together. Reduce skew by using matched trace lengths. Tight skew control is required to minimize emissions and proper data recovery of the devices. Route each channel's differential signals very close to each other for optimal cancellation of their respective external magnetic fields. Use a constant distance between the differential traces to avoid irregularities in differential impedance. Avoid 90 turns (use two 45 turns). Minimize the number of vias to further prevent impedance irregularities. www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 10 - 16 AS1153, AS1157 Datasheet - A p p l i c a t i o n s Cables and Connectors Supported transmission media include printed circuit board traces, backplanes, and cables. Use cables and connectors with matched differential impedance (typically 100) to minimize impedance mismatches. Balanced cables such as twisted pair offer superior signal quality and tend to generate less EMI due to magnetic field canceling effects. Balanced cables pick up noise as common mode, which is rejected by the LVDS receiver. Avoid the use of unbalanced cables such as ribbon cable or simple coaxial cable. Termination Due to the high data rates of LVDS drivers, matched termination will prevent the generation of any signal reflections, and reduce EMI. The AS1157 has integrated termination resistors connected across the inputs of each receiver. The value of the integrated resistor is specified in Table 3. The AS1153 requires an external termination resistor. The termination resistor should match the differential impedance of the transmission line and be placed as close to the receiver inputs as possible. Termination resistance values may range between 90 to 132 depending on the characteristic impedance of the transmission medium. Use 1% surface-mount resistors. Board Layout The device should be placed as close to the interface connector as possible to minimize LVDS trace length. Keep the LVDS and any other digital signals separated from each other to reduce crosstalk. Use a four-layer PC board that provides separate power, ground, LVDS signals, and input signals. Isolate the input LVDS signals from each other and the output LVCMOS/LVTTL signals from each other to prevent coupling. Separate the input LVDS signals from the output signals planes with the power and ground planes for best results. Figure 20. Propagation Delay and Transition Time Test Circuit INx+ Pulse Generator** OUTx INx50 50 CL Receiver AS1153, AS1157 * 50 required for pulse generator. ** When testing the AS1157, adjust the pulse generator output to account for internal termination resistor. www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 11 - 16 AS1153, AS1157 Datasheet - A p p l i c a t i o n s Figure 21. Propagation Delay and Transition Time Waveforms INxVID VID = 0 VID = 0 INx+ tPLHD tPHLD VOH VID = (VINx+) - (VINx-) Note: VCM = (VIN- + VIN+) 2 80% 80% 50% 50% 20% OUTx 20% tTLH www.austriamicrosystems.com/Interfaces-LVDS/AS1153 tTHL Revision 1.02 VOL 12 - 16 AS1153, AS1157 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s 10 Package Drawings and Markings Figure 22. 8-pin SOIC Marking Table 6. Packaging Code xxxx xxxx encoded Datecode www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 13 - 16 AS1153, AS1157 Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s Figure 23. 8-pin SOIC Package Diagram www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 14 - 16 AS1153, AS1157 Datasheet - O r d e r i n g I n f o r m a t i o n 11 Ordering Information The devices are available as the standard products shown in Table 7. Table 7. Ordering Information Ordering Code Marking Description Delivery Form Package AS1153 AS1153 Dual LVDS Receiver Tubes 8-pin SOIC AS1153-T AS1153 Dual LVDS Receiver Tape and Reel 8-pin SOIC AS1157 AS1157 Dual LVDS Receiver, with termination Tubes 8-pin SOIC AS1157-T AS1157 Dual LVDS Receiver, with termination Tape and Reel 8-pin SOIC Note: All products are RoHS compliant. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect Technical Support is found at http://www.austriamicrosystems.com/Technical-Support For further information and requests, please contact us mailto:sales@austriamicrosystems.com or find your local distributor at http://www.austriamicrosystems.com/distributor www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 15 - 16 AS1153, AS1157 Datasheet Copyrights Copyright (c) 1997-2010, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact www.austriamicrosystems.com/Interfaces-LVDS/AS1153 Revision 1.02 16 - 16