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| SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FEBRUARY 2009 REV. 1.1.0 GENERAL DESCRIPTION The SP26LV431 is a quad differential line driver that meets the specifications of the EIA standard RS-422 serial protocol. The SP26LV431 features Exar's BiCMOS process allowing low power operational characteristics of CMOS technology while meeting all of the demands of the RS-422 serial protocol over 60Mbps under load. The RS-422 protocol allows up to 10 receivers to be connected to a multipoint bus transmission line. The SP26LV431 features a driver enable control common to all four drivers that places the output pins in a high impedance state. Since the cabling can be as long as 4,000 feet, the RS-422 drivers of the SP26LV431 are equipped with a wide common-mode output voltage range to accommodate ground potential differences. FIGURE 1. TYPICAL APPLICATION CIRCUIT FEATURES * Quad Differential Line Drivers * Compatible with the EIA standard for RS-422 serial protocol * High-Z Output Control * At Least 60Mbps Transmission Rates * 11ns Typical Driver Propagation Delays * Less than 1ns Typical Output Skew * Single +3.3V Supply Operation * Common Driver Enable Control * Compatibility with the industry standard 26LV31 * Ideal For Use with SP26LV432, Quad Receivers Exar Corporation 48720 Kato Road, Fremont CA, 94538 * (510) 668-7000 * FAX (510) 668-7017 * www.exar.com SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 2. PIN OUT ASSIGNMENT REV. 1.1.0 ORDERING INFORMATION PART NUMBER SP26LV431CP-L SP26LV431CN-L SP26LV431CN-L/TR SP26LV431EN-L SP26LV431EN-L/TR PACKAGE 16-pin Plastic DIP 16-pin Narrow SOIC 16-pin Narrow SOIC 16-pin Narrow SOIC 16-pin Narrow SOIC OPERATING TEMPERATURE RANGE 0C to +70C 0C to +70C 0C to +70C -40C to +85C -40C to +85C DEVICE STATUS Active Active Active Active Active 2 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER PIN DESCRIPTIONS Pin Assignments PIN NUMBER 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME DI1 DO1A DO1B ENABLE DO2B DO2A DI2 GND DI3 DO3A DO3B ENABLE DO4B DO4A DI4 VCC TYPE I O O I O O I Pwr I O O I O O I Pwr Driver 1 TTL input. Non-inverted driver 1 output. Inverted driver 1 output. Driver output enable, active HIGH. Inverted driver 2 output. Non-inverted driver 2 output. Driver 2 TTL input. Ground. Driver 3 TTL input. Non-inverted driver 3 output. Inverted driver 3 output. Driver output enable, active LOW. Inverted driver 4 output. Non-inverted driver 4 output. Driver 4 TTL input. +3.0V to +3.6V power supply. DESCRIPTION Pin type: I=Input, O=Output. 3 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER REV. 1.1.0 ABSOLUTE MAXIMUM RATINGS These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability and cause permanent damage to the device. VCC VIN (DC Input Voltage) VOUT (DC Output Voltage) IIK, IOK (Clamp Diode Current) IOUT (DC Output Current, per pin) ICC (DC VCC or GND Current, per pin) Storage Temperature Range Power Dissipation 16-pin PDIP (derate 14.3mW/C above +70C) Power Dissipation 16-pin NSOIC (derate 13.6mW/C above +70C) 0.5V to 7.0V -1.5V to (VCC + 1.5V) -0.5V to 7V 20mA 150mA 150mA -65C to + 150C 1150mW 1100mW CAUTION: ESD (Electrostatic Discharge) sensitive device. Permanent damage may occur on unconnected devices subject to high energy electrostatic fields. Unused devices must be stored in conductive foam or shunts. Personnel should be properly grounded prior to handling this device. The protective foam should be discharged to the destination socket before devices are removed. ELECTRICAL CHARACTERISTICS UNLESS OTHERWISE NOTED: THE FOLLOWING SPECIFICATIONS APPLY FOR VCC = +3.0V TO +3.6V WITH TA = +25OC AND ALL MIN AND MAX LIMITS APPLY ACROSS THE RECOMMENDED OPERATING TEMPERATURE RANGE. SYMBOL VCC VIN or VOUT PARAMETERS Supply Voltage DC Input or Output Voltage MIN. 3.0 TYP. MAX. 3.6 VCC UNITS V V CONDITIONS Input Electrical Characteristics tr or tf VIH VIL Input Rise or Fall Times HIGH Level Input Voltage LOW Level Input Voltage 2.0 0.8 3 ns V V Output Electrical Characteristics VOH VOL VT V T -V T HIGH Level Output Voltage LOW Level Output Voltage Differential Output Voltage Differential Output Voltage Common Mode Output Voltage Difference in Common Mode Output Quiescent Supply Current 2.5 2.9 0.2 0.5 V V V 0.4 3.0 0.4 100 V V V uA VIN = VIH or VIL, IOUT = -20mA VIN = VIH or VIL, IOUT = 20mA RL = 100, Note 1 RL = 100, Note 1 RL = 100, Note 1 RL = 100, Note 1 VIN = VCC or GND, Note 2 2.0 2.7 VOS V OS -V OS ICC 4 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER UNLESS OTHERWISE NOTED: THE FOLLOWING SPECIFICATIONS APPLY FOR VCC = +3.0V TO +3.6V WITH TA = +25OC AND ALL MIN AND MAX LIMITS APPLY ACROSS THE RECOMMENDED OPERATING TEMPERATURE RANGE. SYMBOL IOZ ISC IOFF IOFF PARAMETERS Tri-state Output Leakage Current MIN. TYP. 2.0 MAX. UNITS uA CONDITIONS VOUT = VCC or GND, ENABLE = VIL, ENABLE = VIH Output Short Circuit Current Output Leakage Current Power Off Output Leakage Current Power Off -30 -150 100 -100 mA uA uA VIN = VCC or GND, Notes 1 & 3 VCC = 0V, VOUT = 6V, Note 1 VCC = 0V, VOUT = -0.25V, Note 1 Switching Characteristics tPLHD, tPHLD tSKEW tSKEW tTLH, tTHL tPZH tPZL tPHZ tPLZ CPD CIN NOTE: 1. 2. 3. 4. 5. 6. Refer to EIA specifications for RS-422 serial protocol for exact test conditions. Measured per input. All other inputs at VCC or GND. This is the current sourced when a high output is shorted to GND. Only one output at a time should be shorted. Skew is defined as the difference in propagation delays between complementary outputs at the 50% input. Output disable time is the delay from ENABLE or ENABLE being switched to the output transistors turning off. The actual disable times are less than indicated due to the delay added by the RC time constant of the load. CPD determines the no load dynamic power consumption, PD = (CPDVCC2f) + (ICCVCC), and the no load dynamic power consumption, IS = (CPDVCCf) + ICC. Propagation Delays Skew, SP26LV431C_ Skew, SP26LV431E_ Differential Output Rise/Fall Times Output Enable Time Output Enable Time Output Disable Time Output Disable Time Power Dissipation Capacitance Input Capacitance 50 6 4 11 0.8 18 2 3 10 40 40 35 35 ns ns ns ns ns ns ns ns pF pF Figure 5 Figure 5, Note 4, Figure 5, Note 4 Figure 5 Figure 7 Figure 7 Figure 7, Note 5 Figure 7, Note 5 Note 6 5 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER REV. 1.1.0 FIGURE 3. SP431 BLOCK DIAGRAM FIGURE 4. AC TEST CIRCUIT 6 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 5. PROPAGATION DELAYS FIGURE 6. DRIVER SINGLE-ENDED TRI-STATE TEST CIRCUIT 7 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 7. DRIVER SINGLE-ENDED TRI-STATE WAVEFORMS REV. 1.1.0 FIGURE 8. DIFFERENTIAL RISE AND FALL TIMES 8 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER 1.0 PRODUCT DESCRIPTION The SP26LV431 is a low-power quad differential line driver designed for digital data transmission meeting the specifications of the EIA standard RS-422 serial protocol. The SP26LV431 features Exar's BiCMOS process allowing low power operational characteristics of CMOS technology while meeting all of the demands of the RS-422 serial protocol up to 60Mbps under load in harsh environments. The RS-422 standard is ideal for multi-drop applications and for long-distance communication. The RS-422 protocol allows up to 10 receivers to be connected to a data bus, making it an ideal choice for multi-drop applications. Since the cabling can be as long as 4,000 feet, RS-422 drivers are equipped with a wide common mode output range to accommodate ground potential differences. Because the RS-422 is a differential interface, data is virtually immune to noise in the transmission line. The SP26LV431 accepts TTL or CMOS input levels and translates these to RS-422 output levels. The SP26LV431 features active HIGH and active LOW driver enable controls common to all four driver channels see Table 1. A logic HIGH on the ENABLE pin (pin 4) or a logic LOW on the ENABLE pin (pin 12) will enable the differential driver outputs. A logic LOW on the ENABLE pin (pin 4) and a logic HIGH on the ENABLE pin (pin 12) will force the driver outputs into high impedance (high-Z). Refer to the truth table in Table 1. All drivers are internally protected against short circuits on their outputs. The driver outputs are short-circuit limited to 150mA. The driver output skew times are typically 0.8ns. To minimize reflections, the multipoint bus transmission line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. FIGURE 9. TWO-WIRE BALANCED SYSTEM, RS-422 TABLE 1: TRUTH TABLE, ENABLE/DISABLE FUNCTION COMMON TO ALL FOUR RS-422 DRIVERS ENABLE LOW HIGH don't care ENABLE HIGH don't care LOW INPUT don't care LOW HIGH NON-INVERTING A OUTPUT high-Z LOW HIGH INVERTING B OUTPUT high-Z HIGH LOW 9 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER REV. 1.1.0 FIGURE 10. DIFFERENTIAL PROPAGATION DELAY VS TEMPERATURE FIGURE 11. DIFFERENTIAL PROPAGATION DELAY VS VOLTAGE 10 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 12. DIFFERENTIAL SKEW VS TEMPERATURE FIGURE 13. DIFFERENTIAL SKEW VS VOLTAGE 11 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 14. DIFFERENTIAL TRANSITION TIME VS TEMPERATURE REV. 1.1.0 FIGURE 15. DIFFERENTIAL TRANSITION TIME VS VOLTAGE 12 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 16. COMPLEMENTARY SKEW VS TEMPERATURE FIGURE 17. COMPLEMENTARY SKEW VS VOLTAGE 13 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 18. DIFFERENTIAL VOUT VS IOUT (TEMPERATURE) REV. 1.1.0 FIGURE 19. DIFFERENTIAL VOUT VS IOUT (VCC) 14 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 20. VOUT HIGH VS IOUT (TEMPERATURE) FIGURE 21. VOUT HIGH VS IOUT (VCC) 15 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 22. VOUT LOW VS CURRENT (TEMPERATURE) REV. 1.1.0 FIGURE 23. VOUT LOW VS CURRENT (VCC) 16 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 24. SUPPLY CURRENT VS TEMPERATURE FIGURE 25. SUPPLY CURRENT VS VOLTAGE 17 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 26. SUPPLY CURRENT VS DATA RATE REV. 1.1.0 FIGURE 27. ICC (LOADED) VS DATA RATE 18 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER FIGURE 28. SHORT CIRCUIT CURRENT VS TEMPERATURE FIGURE 29. SHORT CIRCUIT CURRENT VS VOLTAGE 19 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER REV. 1.1.0 PACKAGE DIMENSIONS (16 PIN NSOIC) 20 SP26LV431 REV. 1.1.0 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER PACKAGE DIMENSIONS (16 PIN PDIP) 21 SP26LV431 HIGH SPEED +3.3V QUAD RS-422 DIFFERENTIAL LINE DRIVER REVISION HISTORY DATE 3/08/04 2/24/05 9/05/08 2/19/09 REVISION A B 1.0.0 1.1.0 Production Release. Include tape and reel p/n's. Converted to Exar standard datasheet format. Add -40C to +85C temperature range option. Changed revision to 1.0.0. Add 3ns maximum driver skew for industrial temperature option. DESCRIPTION REV. 1.1.0 NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user's specific application. While the information in this publication has been carefully checked; no responsibility, however, is assumed for inaccuracies. EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circumstances. Copyright 2009 EXAR Corporation Datasheet February 2009. Send your UART technical inquiry with technical details to hotline: uarttechsupport@exar.com. Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited. 22 |
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