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SN54LS373,SN54LS374,SN54S373,SN54S374,SN74LS373,SN74LS374,SN74S373,SN74S374OCTALD-TYPETRANSPARENTLATCHESANDEDGE-TRIGGEREDFLIP-FLOPSSDLS165B–OCTOBER1975–REVISEDAUGUST20021POSTOFFICEBOX655303•DALLAS,TEXAS75265ChoiceofEightLatchesorEightD-TypeFlip-FlopsinaSinglePackage3-StateBus-DrivingOutputsFullParallelAccessforLoadingBufferedControlInputsClock-EnableInputHasHysteresistoImproveNoiseRejection(’S373and’S374)P-N-PInputsReduceDCLoadingonDataLines(’S373and’S374)descriptionThese8-bitregistersfeature3-stateoutputsdesignedspecificallyfordrivinghighlycapacitiveorrelativelylow-impedanceloads.Thehigh-impedance3-stateandincreasedhigh-logic-leveldriveprovidetheseregisterswiththecapabilityofbeingconnecteddirectlytoanddrivingthebuslinesinabus-organizedsystemwithoutneedforinterfaceorpullupcomponents.Thesedevicesareparticularlyattractiveforimplementingbufferregisters,I/Oports,bidirectionalbusdrivers,andworkingregisters.Theeightlatchesofthe’LS373and’S373aretransparentD-typelatches,meaningthatwhiletheenable(CorCLK)inputishigh,theQoutputsfollowthedata(D)inputs.WhenCorCLKistakenlow,theoutputislatchedatthelevelofthedatathatwassetup.Theeightflip-flopsofthe’LS374and’S374areedge-triggeredD-typeflip-flops.Onthepositivetransitionoftheclock,theQoutputsaresettothelogicstatesthatweresetupattheDinputs.Schmitt-triggerbufferedinputsattheenable/clocklinesofthe’S373and’S374devicessimplifysystemdesignasacanddcnoiserejectionisimprovedbytypically400mVduetotheinputhysteresis.Abufferedoutput-control(OC)inputcanbeusedtoplacetheeightoutputsineitheranormallogicstate(highorlowlogiclevels)orthehigh-impedancestate.Inthehigh-impedancestate,theoutputsneitherloadnordrivethebuslinessignificantly.OCdoesnotaffecttheinternaloperationofthelatchesorflip-flops.Thatis,theolddatacanberetainedornewdatacanbeentered,evenwhiletheoutputsareoff.Copyright2002,TexasInstrumentsIncorporatedPleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.SN54LS373,SN54LS374,SN54S373,SN54S374...JORWPACKAGESN74LS373,SN74S374...DW,N,ORNSPACKAGESN74LS374...DB,DW,N,ORNSPACKAGESN74S373...DWORNPACKAGE(TOPVIEW)32120199101112134567818171615148D7D7Q6Q6D2D2Q3Q3D4DSN54LS373,SN54LS374,SN54S373,SN54S374...FKPACKAGE(TOPVIEW)1D1QOC5Q5D8Q4QGNDCVCC1234567891020191817161514131211OC1Q1D2D2Q3Q3D4D4QGNDVCC8Q8D7D7Q6Q6D5D5QC††Cfor’LS373and’S373;CLKfor’LS374and’S374.†Cfor’LS373and’S373;CLKfor’LS374and’S374.†PRODUCTIONDATAinformationiscurrentasofpublicationdate.ProductsconformtospecificationsperthetermsofTexasInstrumentsstandardwarranty.Productionprocessingdoesnotnecessarilyincludetestingofallparameters.OnproductscomplianttoMIL-PRF-38535,allparametersaretestedunlessotherwisenoted.Onallotherproducts,productionprocessingdoesnotnecessarilyincludetestingofallparameters.SN54LS373,SN54LS374,SN54S373,SN54S374,SN74LS373,SN74LS374,SN74S373,SN74S374OCTALD-TYPETRANSPARENTLATCHESANDEDGE-TRIGGEREDFLIP-FLOPSSDLS165B–OCTOBER1975–REVISEDAUGUST20022POSTOFFICEBOX655303•DALLAS,TEXAS75265ORDERINGINFORMATIONTAPACKAGE†ORDERABLEPARTNUMBERTOP-SIDEMARKINGTubeSN74LS373NSN74LS373NPDIPNTubeSN74LS374NSN74LS374NPDIP–NTubeSN74S373NSN74S373NTubeSN74S374NSN74S374NTubeSN74LS373DWLS373TapeandreelSN74LS373DWRLS373TubeSN74LS374DWLS3740°Cto70°CSOICDWTapeandreelSN74LS374DWRLS3740°Cto70°CSOIC–DWTubeSN74S373DWS373TapeandreelSN74S373DWRS373TubeSN74S374DWS374TapeandreelSN74S374DWRS374TapeandreelSN74LS373NSR74LS373SOP–NSTapeandreelSN74LS374NSR74LS374TapeandreelSN74S374NSR74S374SSOP–DBTapeandreelSN74LS374DBRLS374ATubeSN54LS373JSN54LS373JTubeSNJ54LS373JSNJ54LS373JTubeSN54LS374JSN54LS374JCDIPJTubeSNJ54LS374JSNJ54LS374JCDIP–JTubeSN54S373JSN54S373JTubeSNJ54S373JSNJ54S373JTubeSN54S374JSN54S374J–55°Cto125°CTubeSNJ54S374JSNJ54S374JTubeSNJ54LS373WSNJ54LS373WCFP–WTubeSNJ54LS374WSNJ54LS374WTubeSNJ54S374WSNJ54S374WTubeSNJ54LS373FKSNJ54LS373FKLCCCFKTubeSNJ54LS374FKSNJ54LS374FKLCCC–FKTubeSNJ54S373FKSNJ54S373FKTubeSNJ54S374FKSNJ54S374FK†Packagedrawings,standardpackingquantities,thermaldata,symbolization,andPCBdesignguidelinesareavailableat–OCTOBER1975–REVISEDAUGUST20023POSTOFFICEBOX655303•DALLAS,TEXAS75265FunctionTables’LS373,’S373(eachlatch)INPUTSOUTPUTOCCDQLHHHLHLLLLXQ0HXXZ’LS374,’S374(eachlatch)INPUTSOUTPUTOCCLKDQL↑HHL↑LLLLXQ0HXXZSN54LS373,SN54LS374,SN54S373,SN54S374,SN74LS373,SN74LS374,SN74S373,SN74S374OCTALD-TYPETRANSPARENTLATCHESANDEDGE-TRIGGEREDFLIP-FLOPSSDLS165B–OCTOBER1975–REVISEDAUGUST20024POSTOFFICEBOX655303•DALLAS,TEXAS75265logicdiagrams(positivelogic)OCfor’S373Only11132C1DC11D1Q452DC11D2Q763DC11D3Q894DC11D4Q13125DC11D5Q14156DC11D6Q17167DC11D7Q18198DC11D8QPinnumbersshownareforDB,DW,J,N,NS,andWpackages.OCfor’S374Only11132CLK1DC11D1Q452D1D2Q763D1D3Q894D1D4Q13125D1D5Q14156D1D6Q17167D1D7Q18198D1D8Q’LS373,’S373TransparentLatches’LS374,’S374Positive-Edge-Triggere