DS22AM资料

DS22/DS22A/DS23ATRI-STATERS-422DualDifferentialLineDriverandReceiverPairsJune1998

DS22/DS22A/DS23ATRI-STATE®

RS-422DualDifferentialLineDriverandReceiverPairs

GeneralDescription

TheDS22/22AandDS23AareDualDifferentialLineDriverandReceiverpairs.Thesedevicesaredesignedspe-cificallyforapplicationsmeetingtheST506,ST412andESDIDiskDriveStandards.Inaddition,thedevicesmeettherequirementsoftheEIAStandardRS-422.

Thesedevicesofferaninputsensitivityof200mVovera±7Vcommonmodeoperatingrange.Hysteresisisincorpo-rated(typically70mV)toimprovenoisemarginforslowlychanginginputwaveforms.Aninputfail-safecircuitispro-videdsuchthatifthereceiverinputsareopentheoutputas-sumesthelogicalonestate.

TheDS22AandDS23Adriversaredesignedtoprovideunipolardifferentialdrivetotwistedpairorparallelwiretrans-missionlines.ComplementaryoutputsarelogicallyANDedandprovideanoutputskewof0.5ns(typ.)withpropagationdelaysof12ns.

BothdevicesfeatureTRI-STATEoutputs.TheDS22/22Ahaveindependentcontrolfunctionscommontoadriverandreceiverpair.TheDS23Ahasseparatedriverandreceivercontrolfunctions.

Powerup/downcircuitryisfeaturedwhichwillTRI-STATEtheoutputsandpreventerroneousglitchesonthetransmis-sionlinesduringsystempoweruporpowerdownoperation.TheDS22/22AandDS23Aaredesignedtobecompat-iblewithTTLandCMOS.

Features

nnnnnnnnnn

12nstypicalpropagationdelayOutputskew—±0.5nstypical

MeetstherequirementsofEIAStandardRS-422ComplementaryDriverOutputs

Highdifferentialorcommon-modeinputvoltagerangesof±7V

±0.2VreceiversensitivityovertheinputvoltagerangeReceiverinputfail-safecircuitry

Receiverinputhysteresis—70mVtypicalGlitchfreepowerup/downTRI-STATEoutputs

ConnectionDiagrams

DS22ADual-In-Line

DS008511-1

OrderNumberDS22M,DS22N,

DS22AMorDS22AN

SeeNSPackageNumberM16AorN16E

TRI-STATE®isaregisteredtrademarkofNationalSemiconductorCorp.

©1998NationalSemiconductorCorporationDS008511www.national.com

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ConnectionDiagrams

(Continued)

DS23ADual-In-Line

DS008511-2

OrderNumberDS23AM,DS23AN,SeeNSPackageNumberM16AorN16E

TruthTablesDS22/22A

EN10101

EN20011

RO1ACTIVEHI-ZACTIVEHI-Z

RO2ACTIVEACTIVEHI-ZHI-Z

DO1ACTIVEHI-ZACTIVEHI-Z

DO2ACTIVEACTIVEHI-ZHI-Z

DS23A

DEN0101

REN0011

RO1ACTIVEACTIVEHI-ZHI-Z

RO2ACTIVEACTIVEHI-ZHI-Z

DO1ACTIVEHI-ZACTIVEHI-Z

DO2ACTIVEHI-ZACTIVEHI-Z

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AbsoluteMaximumRatings(Note1)

IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.

SupplyVoltage7VDriveInputVoltage−0.5Vto+7VOutputVoltage5.5VReceiverOutputSinkCurrent50mA

±10VReceiverInputVoltage

±12VDifferentialInputVoltage

MaximumPackagePowerDissipation@+25˚CMPackage1300mW

NPackage1450mW

DerateMPackage10.4mW/˚Cabove+25˚CDerateNPackage11.6mW/˚Cabove+25˚CStorageTemperatureRange−65˚Cto+165˚CLeadTemp.(Soldering,4seconds)260˚C

RecommendedOperatingConditions

SupplyVoltageTemperature(TA)

Min4.50

Max5.570

UnitsV˚C

DS22/22AandDS23AElectricalCharacteristics(Notes2,3,4)

SymbolRECEIVERVTHVHYSTRINIINVOHVOLISCDRIVERVOHVOLIOFF|VT|–|VT|VT

|VOS–VOS|ISCIOZTRI-STATELeakageICCVCC=MAX

ACTIVETRI-STATE

DRIVERandENABLEINPUTSVIHVILIILIIHIIVCLVVVV

CCCCCCCCConditions

−7V≤VCM≤+7V

−7V≤VCM≤+7V

VIN=−7V,+7V(OtherInput=GND)VIN=10V

VIN=−10V

VCC=MIN,IOH=−400µAVCC=MAX,IOL=8mAVVVV

CCMin−200154.0

TypMax+200

UnitsmVmVkΩ

±35

706.0

3.25−3.25

2.5

0.5

−152.5

0.51000.4

2.0

0.4−100

mAmAVVmAVVµAVVVmAµAµAmAmAV

=MAX,VOUT=0V=MIN,IOH=−20mA=MIN,IOL=+20mA=0V,VOUT=5.5V

CCCCCCV

CC=MAX,VOUT=0V

VOUT=2.5VVOUT=0.4V

−30−15050−507678

DRIVERandRECEIVER

VCC=MAX

2.0

0.8

=MAX,VIN=0.4V=MAX,VIN=2.7V=MAX,VIN=7.0V=MIN,IIN=−18mA

−40

−20020100−1.5

VµAµAµAV

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ReceiverSwitchingCharacteristics

(Figures1,2,3)

Parameter

TpLHTpHL|TpLH–TpHL|

Skew(ChanneltoChannel)TpLZTpHZTpZLTpZHConditionsCL=30pFCL=30pFCL=30pF

CL=30pF

CL=15pFS2OpenCL=15pFS1OpenCL=30pFS2OpenCL=30pFS1Open

Min

Typ

22

12120.50.515152020

22.522.553.0

Max

22A/23A

20203.52.0

nsnsnsnsnsnsnsnsUnits

DriverSwitchingCharacteristics

Parameter

Conditions

Min

Typ

22

SINGLEENDEDCHARACTERISTICS(Figures4,5,6,8)TpLHCL=30pFTpHLTTLHTTHL|TpLH–TpHL|Skew

Skew(ChanneltoChannel)TpLZTpHZTpZLTpZHCL=30pF

CL=30pFCL=30pFCL=30pFCL=30pFCL=30pFCL=30pF

CL=30pF

CL=30pF(Note5)

1212550.50.50.51515202012120.5

15156.0

15152.75

53.0

3.52.0

15151010

Max

22A/23A

15151010

nsnsnsnsnsnsnsnsnsnsnsnsnsnsUnits

DIFFERENTIALSWITCHINGCHARACTERISTICS(Note6),(Figure4)TpLHCL=30pFTpHL|TpLH–TpHL|

CL=30pF

CL=30pF

Note1:“AbsoluteMaximumRatings”arethosevaluesbeyondwhichthesafetyofthedevicecannotbeguaranteed.Theyarenotmeanttoimplythatthedeviceshouldbeoperatedattheselimits.TheTableof“ElectricalCharacteristics”providesconditionsforactualdeviceoperation.

Note2:Allcurrentsintodevicepinsareshownaspositivevalues;allcurrentsoutofthedeviceareshownasnegative;allvoltagesarereferencedtogroundunlessotherwisespecified.Allvaluesshownasmaxorminareclassifiedonabsolutevaluebasis.Note3:AlltypicalvaluesareVCC=5V,TA=25˚C.Note4:Onlyoneoutputatatimeshouldbeshorted.Note5:

Differencebetweencomplementaryoutputsatthe50%point.

Note6:DifferentialDelaysaredefinedascalculatedresultsfromsingleendedriseandfalltimemeasurements.ThisapproachinestablishingACperformancespecificationshasbeentakenduetolimitationsofavailableAutomaticTestEquipment(ATE).

ThecalculatedATEresultsassumealineartransitionbetweenmeasurementpointsandarearesultofthefollowingequations:

Where:

Tcp=CrossingPoint

Tra,Trb,TfaandTfbaretimemeasurementswithrespecttotheinput.

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SwitchingTimeWaveforms

DS008511-3

ACTestCircuitsandSwitchingWaveforms

DS008511-4

FIGURE1.

DS008511-5

FIGURE2.

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ACTestCircuitsandSwitchingWaveforms

(Continued)

DS008511-6

S1

TPLZTPHZTPZLTPZHClosedOpenClosedOpen

S2OpenClosedOpenClosed

S3+2.5V−2.5V+2.5V−2.5V

FIGURE3.

DS008511-7

FIGURE4.

DS008511-8

FIGURE5.

DS008511-9

FIGURE6.

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ACTestCircuitsandSwitchingWaveforms

(Continued)

DS008511-10

FIGURE7.

DS008511-13

FIGURE8.

TypicalPerformanceCharacteristics

DriverVOHvsIOHvsTemperature

(DS23A)

DriverVOHvsIOHvsVCCDS008511-15

DS008511-14

DriverVOLvsIOLvsTemperature

DriverVOLvsIOLvsVCCDS008511-17

DS008511-16

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TypicalPerformanceCharacteristics

ReceiverVOHvsIOHvsTemperature

(DS23A)(Continued)ReceiverVOHvsIOHvsVCCDS008511-19

DS008511-18

ReceiverVOLvsIOLvsTemperature

ReceiverVOLvsIOLvsVCCDS008511-21

DS008511-20

DriverDifferentialPropagationDelayvsTemperature

DriverDifferentialPropagationDelayvsVCCDS008511-22

DS008511-23

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TypicalPerformanceCharacteristics

ReceiverPropagationDelayvsTemperature

(DS23A)(Continued)ReceiverPropagationDelayvsVCCDS008511-24DS008511-25

DriverVODvsTemperatureDriverVODvsVCCDS008511-26DS008511-27

DriverVODvsRLDriverDifferentialTransitionTimevsTemperature

DS008511-28

DS008511-29

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TypicalPerformanceCharacteristics

DriverDifferentialTransitionTimevsVCC(DS23A)(Continued)SupplyCurrentvsTemperature

DS008511-30DS008511-31

SupplyCurrentvsV

CCICCvsDriverSwitchingFrequency

DS008511-32DS008511-33

DriverShortCircuitCurrentvsTemperatureDriverShortCircuitCurrentvsVCCDS008511-34DS008511-35

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TypicalPerformanceCharacteristics

ReceiverShortCircuitCurrentvsTemperature

(DS23A)(Continued)ReceiverShortCircuitCurrentvsVCCDS008511-36DS008511-37

TypicalApplications

ESDIApplication

DS008511-11

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TypicalApplications

(Continued)

ST504andST412Applications

DS008511-12

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PhysicalDimensions

inches(millimeters)unlessotherwisenoted

SOPackage(M)

OrderNumberDS22M,DS22AM,orDS23AM

NSPackageNumberM16A

MoldedDual-In-LinePackage(N)

OrderNumberDS22N,DS22AN,orDS23AN

NSPackageNumberN16E

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DS22/DS22A/DS23ATRI-STATERS-422DualDifferentialLineDriverandReceiverPairsLIFESUPPORTPOLICY

NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDE-VICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTOFNATIONALSEMI-CONDUCTORCORPORATION.Asusedherein:

2.Acriticalcomponentinanycomponentofalifesupport1.Lifesupportdevicesorsystemsaredevicesorsys-deviceorsystemwhosefailuretoperformcanberea-temswhich,(a)areintendedforsurgicalimplantinto

sonablyexpectedtocausethefailureofthelifesupportthebody,or(b)supportorsustainlife,andwhosefail-deviceorsystem,ortoaffectitssafetyoreffectiveness.uretoperformwhenproperlyusedinaccordance

withinstructionsforuseprovidedinthelabeling,canbereasonablyexpectedtoresultinasignificantinjurytotheuser.

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Nationaldoesnotassumeanyresponsibilityforuseofanycircuitrydescribed,nocircuitpatentlicensesareimpliedandNationalreservestherightatanytimewithoutnoticetochangesaidcircuitryandspecifications.