74系列数字芯片资料74ls48

5-1FASTANDLSTTLDATABCDTO7-SEGMENTDECODERTheSN54/74LS48isaBCDto7-SegmentDecoderconsistingofNANDgates,inputbuffersandsevenAND-OR-INVERTgates.SevenNANDgatesandonedriverareconnectedinpairstomakeBCDdataanditscomplementavailabletothesevendecodingAND-OR-INVERTgates.TheremainingNANDgateandthreeinputbuffersprovidelamptest,blankinginput/ripple-blankinginputfortheLS48.Thecircuitaccepts4-bitbinary-coded-decimal(BCD)and,dependingonthestateoftheauxiliaryinputs,decodesthisdatatodriveothercomponents.Therelativepositivelogicoutputlevels,aswellasconditionsrequiredattheauxiliaryinputs,areshowninthetruthtables.TheLS48circuitincorporatesautomaticleadingand/ortrailingedgezero-blankingcontrol(RBIandRBO).LampTest(LT)maybeactivatedanytimewhentheBI/RBOnodeisHIGH.Bothdevicescontainanoverridingblankinginput(BI)whichcanbeusedtocontrolthelampintensitybyvaryingthefrequencyanddutycycleoftheBIinputsignalortoinhibittheoutputs.•LampIntensityModulationCapability(BI/RBO)•InternalPull-UpsEliminateNeedforExternalResistors•InputClampDiodesEliminateHigh-SpeedTerminationEffects14131211109123456VCC716158fgabcdeBCLTBI/RBORBIDAGNDCONNECTIONDIAGRAMDIP(TOPVIEW)LOGICDIAGRAMINPUTBLANKINGINPUTORRIPPLE-BLANKINGOUTPUTRIPPLE-BLANKINGINPUTLAMP-TESTINPUTABCDabcdefgOUTPUTSN54/74LS48BCDTO7-SEGMENTDECODERLOWPOWERSCHOTTKYJSUFFIXCERAMICCASE620-09NSUFFIXPLASTICCASE648-08161161ORDERINGINFORMATIONSN54LSXXJCeramicSN74LSXXNPlasticSN74LSXXDSOIC161DSUFFIXSOICCASE751B-03LOGICSYMBOLVCC=PIN16GND=PIN871263513121110915144ABCDLTRBIabcdefgBI/RBOSN54/74LS481415NUMERICALDESIGNATIONS—RESULTANTDISPLAYS012345678910111213NOTES:(1)BI/RBOiswired-ANDlogicservingasblankinginput(BI)and/orripple-blankingoutput(RBO).Theblankingout(BI)mustbeopenorheldataHIGHlevelwhenoutputfunctions0through15aredesired,andripple-blankinginput(RBI)mustbeopenorataHIGHlevelifblankingofadecimal0isnotdesired.X=inputmaybeHIGHorLOW.(2)WhenaLOWlevelisappliedtotheblankinginput(forcedcondition)allsegmentoutputsgotoaLOWlevel,regardlessofthestateofanyotherinputcondition.(3)Whenripple-blankinginput(RBI)andinputsA,B,C,andDareatLOWlevel,withthelamptestinputatHIGHlevel,allsegmentoutputsgotoaHIGHlevelandtheripple-blankingoutput(RBO)goestoaLOWlevel(responsecondition).(4)Whentheblankinginput/ripple-blankingoutput(BI/RBO)isopenorheldataHIGHlevel,andaLOWlevelisappliedtolamp-testinput,allsegmentoutputsgotoaLOWlevel.TRUTHTABLESN54/74LS48INPUTSOUTPUTS5-2FASTANDLSTTLDATASN54/74LS48PINNAMESLOADING(Notea)HIGHLOWA,B,C,DRBILTBI/RBOBIBCDInputsRipple-Blanking(ActiveLow)InputLamp-Test(ActiveLow)InputBlankingInputorRipple-BlankingOutput(ActiveLow)Blanking(ActiveLow)Input0.5U.L.0.5U.L.0.5U.L.0.5U.L.1.2U.L.0.5U.L.Open-Collector0.25U.L.0.25U.L.0.25U.L.0.75U.L.2(1)U.L.0.25U.L.3.75(1.25)U.L.(48)NOTES:a)UnitLoad(U.L.)=40μAHIGH/1.6mALOWb)OututcurrentmeasuredatVOUT=0.5VOutputLOWdrivefactorisSN54LS/74LS48:1.25U.L.forMilitary(54),3.75U.L.forCommercial(74).DECIMALORFUNCTIONLTRBIDCBABI/RBOabcdefgNOTE0HHLLLLHHHHHHHL11HXLLLHHLHHLLLL12HXLLHLHHHLHHLH3HXLLHHHHHHHLLH4HXLHLLHLHHLLHH5HXLHLHHHLHHLHH6HXLHHLHLLHHHHH7HXLHHHHHHHLLLL8HXHLLLHHHHHHHH9HXHLLHHHHHLLHH10HXHLHLHLLLHHLH11HXHLHHHLLHHLLH12HXHHLLHLHLLLHH13HXHHLHHHLLHLHH14HXHHHLHLLLHHHH15HXHHHHHLLLLLLLBIXXXXXXLLLLLLLL2RBIHLLLLLLLLLLLLL3LTLXXXXXHHHHHHHH45-3FASTANDLSTTLDATASN54/74LS48GUARANTEEDOPERATINGRANGESSymbolParameterMinTypMaxUnitVCCSupplyVoltage54744.54.755.05.05.55.25VTAOperatingAmbientTemperatureRange5474–550252512570°CIOHOutputCurrent—Highatog54,74–100μAIOHOutputCurrent—HighBI/RBO54,74–50μAIOLOutputCurrent—Lowatog54742.06.0mAIOLOutputCurrent—LowBI/RBOBI/RBO54741.63.2mADCCHARACTERISTICSOVEROPERATINGTEMPERATURERANGE(unlessotherwisespecified)SblPLimitsUiTCdiiSymbolParameterMinTypMaxUnitTestConditionsVIHInputHIGHVoltage2.0VGuaranteedInputHIGHVoltageforAllInputsVILInputLOWVoltage540.7VGuaranteedInputLOWVoltageforVILInputLOWVoltage740.8VpgAllInputsVIKInputClampDiodeVoltage–1.5VVCC=MIN,IIN=–18mAVOHOutputHIGHVoltage2442μAVCC=MIN,IOH=–50μA,VOHOutputHIGHVoltage2.44.2μACC,OHμ,VIN=VIHorU.L.perTruthTableIOOutputCurrentatog–1.3–2.0mAVCC=MIN,VO=0.85VInputConditionerasforVOHVOLOutputLOWVoltageatog54,740.4VIOL=2.0mAVCC=MIN,VIH=2.0VVOLOutputLOWVoltageatog740.5VIOL=6.0mACC,IHVIL=VILMAXVOLOutputLOWVoltage54,740.4VIOL=1.6mAVCC=MAX,VIH=2.0VVOLpgBI/RBO740.5VIOL=3.2mACC,IHVIL=VILMAXIIHInputHIGHCurrent20μAVCC=MAX,VIN=2.7VIIHp(ExceptBI/RBO)0.1mAVCC=MAX,VIN=7.0VIILInputLOWCurrent(ExceptBI/RBO)–0.4mAVCC=MAX,VIN=0.4VIILInputLOWCurrentBI/RBO–1.2mAVCC=MAX,VIN=0.4VICCPowerSupplyCurrent2538mAVCC=MAXIOSShortCircuitCurrentBI/RBO(Note1)–0.3–2.0mAVCC=MAXNote1:Notmorethanoneoutputshouldbeshortedatatime,norformorethan1second.ACCHARACTERISTICS(VCC=5.0V,TA=25°C)SblPLimitsUiTCdiiSymbolParameterMinTypMaxUnitTestConditionstPHLPropagationDelayTime,HIGH-to-LOWLevelOutputfromAInput100nsCL=15pFRL=40kΩtPLHPropagationDelayTime,LOW-to-HIGHLevelOutputfromAInput100nsCL=15pF,RL=4.0kΩtPHLPropagationDelayTime,HIGH-to-LOWLevelOutputfromRBIInput100nsCL=15pFRL=60kΩtPLHPropagationDelayTime,LOW-to-HIGHLevelOutputfromRBIInput100nsCL=15pF,RL=6.0kΩ