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®SP431High Speed, +3.3V Quad RS-422Differential Line Drivers Compatible with the EIA standard forRS-422 serial protocol

s Quad Differential Line Driverss High-Z Output Control

s At Least 60Mbps Transmission Ratess 11ns Typical Driver Propagation Delayss Less than 1ns Typical Output Skews Single +3.3V Supply Operations Common Driver Enable Control

s Compatibility with the industry standard26LV31

The SP431 is a quad differential line driver that meets the specifications of the EIA standardRS-422 serial protocol. The SP431 features Sipex's BiCMOS process allowing low poweroperational characteristics of CMOS technology while meeting all of the demands of theRS-422 serial protocol over 60Mbps under load. The RS-422 protocol allows up to 10receivers to be connected to a multipoint bus transmission line. The SP431 features a driverenable 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 SP431 are equippedwith a wide common-mode output voltage range to accommodate ground potential differ-ences.

DI1D01AD01BENABLED02BD02ADI2GND1234567816VCCVCCDI4INPUTSDI3DI2DI1SP43115DI414D04A13D04B12ENABLE11D0B310D0A39DI3ENABLEENABLEDOADOBDOADOBDOADOBDOADOB34322114GNDOUTPUTSRev. 12/06/01SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver© Copyright 2001 Sipex Corporation

ABSOLUTE MAXIMUM RATINGS

These are stress ratings only and functional operation of the device atthese ratings or any other above those indicated in the operation sectionsof the specifications below is not implied. Exposure to absolutemaximum rating conditions for extended periods of time may affectreliability and cause permanent damage to the device.

VCC........................................................................................0.5V to 7.0VVIN (DC Input Voltage).............................................-1.5V to (VCC + 1.5V)VOUT (DC Output Voltage)......................................................-0.5V to 7VIIK, IOK (Clamp Diode Current)........................................................±20mAIOUT (DC Output Current, per pin)................................................±150mAICC (DC VCC or GND Current, per pin)..........................................±150mATSTG (Storage Temperature Range)...............................-65°C to +150°CStorage Temperature....................................................-65°C to +150°CPower Dissipation Per Package

16-pin PDIP (derate 14.3mW/oC above +70oC).........................1150mW16-pin NSOIC (derate 13.6mW/oC above +70oC)......................1100mW

SPECIFICATIONS

Unless otherwise noted, the following specifications apply for VCC = +3.0V to +3.6V with Tamb = 25°C and all MINand MAX limits apply across the recommended operating temperature range.

DCPARAMETERSSupplyVoltage,VCCDCInputorOutputVoltage,VINorVOUTInputElectricalCharacteristicsInputRiseorFallTimes,trortfHIGHLevelInputVoltage,VIHLOWLevelInputVoltage,VILOutputElectricalCharacteristicsHIGHLevelOutputVoltage,VOHLOWLevelOutputVoltage,VOLDifferentialOutputVoltage,VTDifferenceinDifferentialOutput,|VT|-|VT|CommonModeOutputVoltage,VOSDifferenceinCommonModeOutput,|VOS-VOS|QuiescentSupplyCurrentICCTri-stateOutputLeakageCurrent,IOZ±2.0100µAµAVIN=VCCorGND,Note2VOUT=VCCorGND,ENABLE=VIL,ENABLE=VIHVIN=VCCorGND,Notes1and3VCC=0V,VOUT=6V,Note1VCC=0V,VOUT=-0.25V,Note1© Copyright 2001 Sipex Corporation

MIN.TYP.MAX.3.03.6VCC32.00.8UNITSVVCONDITIONSnsVV2.52.90.20.5VVV0.43.00.4VVVVIN=VIHorVIL,IOUT=-20mAVIN=VIHorVIL,IOUT=20mARL=100Ω,Note1RL=100Ω,Note1RL=100Ω,Note1RL=100Ω,Note12.02.7OutputShortCircuitCurrent,ISCOutputLeakageCurrentPowerOffIOFFIOFFRev. 12/06/01

-30-150mA100-100µAµASP431 High Speed, +3.3V Quad RS-422 Differential Line Driver

SPECIFICATIONS (continued)

Unless otherwise noted, the following specifications apply for VCC = +3.0V to +3.6V, Tamb = 25°C, tr < 6ns, tf < 6ns,and all MIN and MAX limits apply across the recommended operating temperature range.

PARAMETERSSWITCHINGCHARACTERISTICSPropagationDelays,tPLHD,tPHLDSkewDifferentialOuputRiseandFallTimes,tTLH,tPHLOutputEnableTime,tPZHOutputEnableTime,tPZLOutputDisableTime,tPHZOutputDisableTime,tPLZPowerdissipationCapacitance,CPDInputCapacitance,CINMIN.TYP.MAX.UNITSCONDITIONS110.841821040403535nsnsnsnsnsnsnspFpFFigure3Figure3,Note4Figure3Figure5Figure5Figure5,Note5Figure5,Note5Note6506NOTE 1: Refer to EIA specifications for RS-422 serial protocol for exact test conditions.NOTE 2: Measured per input. All other inputs at VCC or GND.

NOTE 3: This is the current sourced when a high output is shorted to GND. Only one output at a time should be shorted.NOTE 4: Skew is defined as the difference in propagation delays between complementary outputs at the 50% input.

NOTE 5: 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.

NOTE 6: CPD determines the no load dynamic power consumption, PD = (CPDVCC2 f) + (ICCVCC), and the no load dynamiccurrent consumption, IS = (CPDVCCf) + ICC.

VCCDI4INPUTSDI3DI2DI1ENABLEENABLEDOADOBDOADOBDOADOBDOADOB34322114GNDFigure 1. SP431 Block Diagram

AC TEST CIRCUITS AND SWITCHING TIME WAVEFORMS

f=1 MHz tR < 10ns, tF < 10nsDRIVERINPUT DIX3V1.5VtPLHD1.5VtPHLD0V (Differential)DRIVER D0XA80%DIFFERENTIALOUTPUT20%tTLH0VVDIFF = VA - VBtTHL80%0V20%0VVOLGNDVOHCLGeneratorDriverEnabledDIX50ΩDCLCLRLD0XAD0XBDRIVER D0XBFigure 2. AC Test CircuitFigure 3. Propagation DelaysVCCS1D0XAS2TestPointS3110ΩCLENABLE3VVCC1.5VENABLEtPHZInput = ENABLE or ENABLES1= VCCS2 = D0XAS3 = GNDand/orS1 = GNDtPLZS2 = D0XBS3 = GNDInput = ENABLE or ENABLES1= GNDS2 = D0XBS3 = VCCand/orS1 = VCCS2 = D0XAS3 = VCC1.5V0VtPZHVOH = 0.3V1.3VVOHGNDD0XBENABLEENABLEtPZLVOL+ 0.3VVCC1.3VVOLIf ENABLE is the selected input, then ENABLE = HIGHIf ENABLE is the selected input, then ENABLE = LOWTo force the driver outputs into high-Z, ENABLE = LOW ENABLE = HIGHFigure 4. Driver Single-Ended TRI-STATE Test CircuitFigure 5. Driver Single-Ended TRI-STATE Waveforms

3.0VINPUT0.0VOUTPUT(DIFFERENTIAL)90%10%tTLHInput pulse:f = 1MHz, 50%tr < 6nstf < 6nstTHL90%10%Figure 6. Differential Rise and Fall Times

Rev. 12/06/01

SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver

DESCRIPTION

The SP431 is a low-power quad differential linedriver designed for digital data transmissionmeeting the specifications of the EIA standardRS-422 serial protocol. The SP431 featuresSipex's BiCMOS process allowing low poweroperational characteristics of CMOS technol-ogy while meeting all of the demands of theRS-422 serial protocol up to 60Mbps under loadin harsh environments.

The RS-422 standard is ideal for multi-dropapplications and for long-distance communica-tion. The RS-422 protocol allows up to 10drivers to be connected to a data bus, making itan ideal choice for multi-drop applications. Sincethe cabling can be as long as 4,000 feet, RS-422drivers are equipped with a wide common modeoutput range to accommodate ground potentialdifferences. Because the RS-422 is a differentialinterface, data is virtually immune to noise inthe transmission line.The SP431 accepts TTL or CMOS input levelsand translates these to RS-422 output levels. TheSP431 features active HIGH and active LOWdriver enable controls common to all four driverchannels see Figure 8. A logic HIGH on theENABLE pin (pin 4) or a logic LOW on theENABLE pin (pin 12) will enable the differentialdriver outputs. A logic LOW on the ENABLEpin (pin 4) and a logic HIGH on the ENABLE pin(pin 12) will force the driver outputs into highimpedance (high-Z). Refer to the truth table inFigure 8.The RS-422 line driver outputs feature highsource and sink current capability. All driversare internally protected against short circuits ontheir outputs. The driver outputs are short-circuitlimited to 150mA. The driver output skew timesare typically 0.8ns.

To minimize reflections, the multipoint bustransmission line should be terminated at bothends in its characteristic impedance, and stublengths off the main line should be kept as shortas possible.

ENABLEENABLEDATAOUTPUTDATA*RT*RT is optional although highly recommended to reduce reflection.Figure 7. Two-Wire Balanced System, RS-422Non-InvertingOutputhigh-ZLOWHIGHENABLEENABLEInputInvertingOutputhigh-ZHIGHLOWLOWHIGHdon'tcareHIGHdon'tcareLOWdon'tcareLOWHIGHFigure 8. Truth Table, Enable / Disable FunctionCommon to All Four RS-422 Drivers

12.512.011.5VCC = 3.0VtPHLD12.011.5Differential Prop. Delay (ns)Differential Prop. Delay (ns)tPHLD11.011.010.510.09.59.0tPHLD10.5tPHLD10.09.58.58.0-40-15103560859.03.03.13.23.33.43.53.6Temperature (°C)Power Supply Voltage (V)Figure 9. Differential Propagation Delay vsTemperature

1.251.151.05VCC = 3.3VFigure 10. Differential Propagation Delay vs Voltage

1.81.61.4

Differential Skew (ns)0.950.850.750.650.550.450.350.25-40-1510356085Differential Skew (ns)1.21.00.80.60.40.20.03.0

3.13.23.33.43.53.6

Temperature (°C)Power Supply Voltage (V)

Figure 11. Differential Skew vs TemperatureFigure 12. Differential Skew vs Voltage

8VCC = 3.3V75.04.5Differential Transition Time (ns)Differential Transition Time (ns)tTHL4.0tTLH3.565tTLH43.0tTHL32.52-40-15103560852.03.03.13.23.33.43.53.6Temperature (°C)Power Supply Voltage (V)Figure 13. Differential Transition Time vs TemperatureFigure 14. Differential Transition Time vs Voltage

1.2Vcc = 3.3V1.00.800.75Complementary Skew (ns)Complementary Skew (ns)-15103560850.700.80.650.60.600.40.550.2-400.503.03.13.23.33.43.53.6Temperature (°C)Power Supply Voltage (V)Figure 15. Complementary Skew vs TemperatureFigure 16. Complementary Skew vs Voltage

3.33.1VCC = 3.3V3.63.2Differential Output Voltage (V)Differential Output Voltage (V)2.92.72.5T= -40°C2.32.1T=+25°C1.9T= +85°C1.7VCC = 3.6V2.8VCC = 3.3V2.4VCC = 3.0V2.01.61.21.501530456001346Output Current (mA)Output Current (mA)Figure 17. Differential VOUT vs IOUT (Temperature)Figure 18. Differential VOUT vs IOUT (VCC )

3.3VCC = 3.3V3.13.63.2VCC = 3.6VOutput High Voltage (V)Output High Voltage (V)2.9T= -40°C2.7T=+25°C2.5T= +85°C2.8VCC = 3.3V2.4VCC = 3.0V2.02.31.62.1013461.201346Output High Current (mA)Output High Current (mA)Figure 19. VOUT high vs IOUT (Temperature)Figure 20. VOUT high vs IOUT (VCC )

0.7VCC = 3.3V0.60.50.40.30.20.10.001346T=+25°T= -40°CT= +85°C0.6VCC = 3.0V0.5VCC = 3.3VOutput Low Voltage (V)Output Low Voltage (V)0.4VCC = 3.6V0.30.20.10.001346Output Low Current (mA)Output Low Current (mA)Figure 21. VOUT low vs Current (Temperature)Figure 22. VOUT low vs Current (VCC)

2.5VCC = 3.0VDIN = 3.0V2.03.53.02.52.01.51.0Supply Current (µA)1.51.00.5Supply Current (uA)-15103560850.50.0-40Temperature (°C)0.03.03.13.23.33.43.53.6Power Supply Voltage (V)Figure 23. Supply Current vs TemperatureFigure 24. Supply Current vs Voltage

50VCC = 3.0V40104VCC = 3.0V102No Load Supply Current (mA)1101001,00010,000100,000No Load Supply Current (mA)1009694923020100901101001,00010,000100,000Data Rate (kBaud)Data Rate (kBaud)Figure 25. Supply Current vs Data RateFigure 26. ICC (loaded) vs Data Rate

50Vcc=3.0V4865Output Short Circuit Current (mA)4442403836-40Output Short Circuit Current (mA)-151035608560555045403.03.13.23.33.43.53.6Temperature (°C)Power Supply Voltage (V)Figure 27. Short Circuit Current vs TemperatureFigure 28. Short Circuit Current vs Voltage

DI1D01AD01BENABLED02BD02ADI2GND1234567816VCCSP43115DI414D04A13D04B12ENABLE11D0B310D0A39DI3PINOUT

PIN ASSIGNMENTS

PIN NUMBER

PIN NAME

DESCRIPTION

DI1D01BENABLED02BD02ADI2GNDDI3D03AD03BD04BD04ADI4VCC

Driver 1 TTL input.Non-inverted driver output.Inverted driver output.

Driver output enable, active HIGH.Inverted driver output.Non-inverted driver output.Driver 2 TTL input.Ground.

Driver 3 TTL input.Non-inverted driver output.Inverted driver output.

Driver output enable, active LOW.Inverted driver output.Non-inverted driver output.Driver 4 TTL input.

+3.0V to +3.6V power supply.

2D01A345671011

12ENABLE13141516

Rev. 12/06/01

SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver

PACKAGE:PLASTICDUAL–IN–LINE(NARROW)E1ED1 = 0.005\" min.(0.127 min.)DA1 = 0.015\" min.(0.381min.)A = 0.210\" max.(5.334 max).A2CØeA = 0.300 BSC(7.620 BSC)Le = 0.100 BSC(2.540 BSC)B1BALTERNATEEND PINS(BOTH ENDS)DIMENSIONS (Inches)Minimum/Maximum(mm)A2BB1CDEE1LØ16–PIN0.115/0.195(2.921/4.953)0.014/0.022(0.356/0.559)0.045/0.070(1.143/1.778)0.008/0.014(0.203/0.356)0.780/0.800(19.812/20.320)0.300/0.325(7.620/8.255)0.240/0.280(6.096/7.112)0.115/0.150(2.921/3.810)0°/ 15°(0°/15°)Rev. 12/06/01SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver© Copyright 2001 Sipex Corporation

PACKAGE:PLASTICSMALL OUTLINE (SOIC)(NARROW)EHh x 45°DAØeBA1LDIMENSIONS (Inches)Minimum/Maximum(mm)AA1BDEeHhLØ16–PIN0.053/0.069(1.346/1.748)0.004/0.010(0.102/0.249)0.013/0.020(0.330/0.508)0.386/0.394(9.802/10.000)0.150/0.157(3.802/3.988)0.050 BSC(1.270 BSC)0.228/0.244(5.801/6.198)0.010/0.020(0.254/0.498)0.016/0.050(0.406/1.270)0°/8°(0°/8°)Rev. 12/06/01SP431 High Speed, +3.3V Quad RS-422 Differential Line Driver© Copyright 2001 Sipex Corporation

ORDERING INFORMATION

Model....................................................................................Temperature Range.....................................................................................PackageSP431CP.....................................................................................0°C to +70°C........................................................................... 16–pin Plastic DIPSP431CN.....................................................................................0°C to +70°C..........................................................................16–pin Narrow SOICPlease consult the factory for pricing and availability on a Tape-On-Reel option.

CorporationSIGNAL PROCESSING EXCELLENCESipex CorporationHeadquarters andSales Office22 Linnell CircleBillerica, MA 01821TEL: (978) 667-8700FAX: (978) 670-9001e-mail: sales@sipex.comSales Office

233 South Hillview DriveMilpitas, CA 95035TEL: (408) 934-7500FAX: (408) 935-7600

Sipex Corporation reserves the right to make changes to any products described herein. Sipex does not assume any liability arising out of theapplication or use of any product or circuit described herein; neither does it convey any license under its patent rights nor the rights of others.

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