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74HC138.PDF

74HC138

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2011-07-26 0人阅读 举报 0 0 暂无简介

简介:本文档为《74HC138pdf》,可适用于高等教育领域

DATASHEETProductspecificationFileunderIntegratedCircuits,ICSeptemberINTEGRATEDCIRCUITSHCHCTtolinedecoderdemultiplexerinvertingForacompletedatasheet,pleasealsodownload:•TheICHCHCTHCUHCMOSLogicFamilySpecifications•TheICHCHCTHCUHCMOSLogicPackageInformation•TheICHCHCTHCUHCMOSLogicPackageOutlinesSeptemberPhilipsSemiconductorsProductspecificationtolinedecoderdemultiplexerinvertingHCHCTFEATURES•Demultiplexingcapability•Multipleinputenableforeasyexpansion•Idealformemorychipselectdecoding•ActiveLOWmutuallyexclusiveoutputs•Outputcapability:standard•ICCcategory:MSIGENERALDESCRIPTIONTheHCHCTarehighspeedSigateCMOSdevicesandarepincompatiblewithlowpowerSchottkyTTL(LSTTL)TheyarespecifiedincompliancewithJEDECstandardnoATheHCHCTdecodersacceptthreebinaryweightedaddressinputs(A,A,A)andwhenenabled,providemutuallyexclusiveactiveLOWoutputs(YtoY)The“”featuresthreeenableinputs:twoactiveLOW(EandE)andoneactiveHIGH(E)EveryoutputwillbeHIGHunlessEandEareLOWandEisHIGHThismultipleenablefunctionallowseasyparallelexpansionofthe“”toaof(linestolines)decoderwithjustfour“”ICsandoneinverterThe””canbeusedasaneightoutputdemultiplexerbyusingoneoftheactiveLOWenableinputsasthedatainputandtheremainingenableinputsasstrobesUnusedenableinputsmustbepermanentlytiedtotheirappropriateactiveHIGHorLOWstateThe””isidenticaltothe“”buthasinvertingoutputsQUICKREFERENCEDATAGND=VTamb=°Ctr=tf=nsNotesCPDisusedtodeterminethedynamicpowerdissipation(PDinµW):PD=CPD×VCC×fi∑(CL×VCC×fo)where:fi=inputfrequencyinMHzfo=outputfrequencyinMHz∑(CL×VCC×fo)=sumofoutputsCL=outputloadcapacitanceinpFVCC=supplyvoltageinVForHCtheconditionisVI=GNDtoVCCForHCTtheconditionisVI=GNDtoVCC−VORDERINGINFORMATIONSee“HCHCTHCUHCMOSLogicPackageInformation”SYMBOLPARAMETERCONDITIONSTYPICALUNITHCHCTpropagationdelayCL=pFVCC=VtPHLtPLHAntoYnnstPHLtPLHEtoYnEntoYnnsCIinputcapacitancepFCPDpowerdissipationcapacitanceperpackagenotesandpFSeptemberPhilipsSemiconductorsProductspecificationtolinedecoderdemultiplexerinvertingHCHCTPINDESCRIPTIONPINNOSYMBOLNAMEANDFUNCTION,,AtoAaddressinputs,E,Eenableinputs(activeLOW)Eenableinput(activeHIGH)GNDground(V),,,,,,,YtoYoutputs(activeLOW)VCCpositivesupplyvoltageFigPinconfigurationFigLogicsymbolhandbook,halfpageMLBAAAYYYYYYYYEEEFigIEClogicsymbol(a)(b)FigFunctionaldiagramSeptemberPhilipsSemiconductorsProductspecificationtolinedecoderdemultiplexerinvertingHCHCTFUNCTIONTABLENotesH=HIGHvoltagelevelL=LOWvoltagelevelX=don’tcareINPUTSOUTPUTSEEEAAAYYYYYYYYHXXXHXXXLXXXXXXXXXHHHHHHHHHHHHHHHHHHHHHHHHLLLLLLLLHHHHLHLHLLHHLLLLLHHHHLHHHHLHHHHLHHHHHHHHHHHHHHHHLLLLLLLLHHHHLHLHLLHHHHHHHHHHHHHHHHHHHHHHLHHHHLHHHHLHHHHLFigLogicdiagramSeptemberPhilipsSemiconductorsProductspecificationtolinedecoderdemultiplexerinvertingHCHCTDCCHARACTERISTICSFORHCFortheDCcharacteristicssee“HCHCTHCUHCMOSLogicFamilySpecifications”Outputcapability:standardICCcategory:MSIACCHARACTERISTICSFORHCGND=Vtr=tf=nsCL=pFSYMBOLPARAMETERTamb(°C)UNITTESTCONDITIONSHCVCC(V)WAVEFORMS−to−tomintypmaxminmaxminmaxtPHLtPLHpropagationdelayAntoYnnsFigtPHLtPLHpropagationdelayEtoYnnsFigtPHLtPLHpropagationdelayEntoYnnsFigtTHLtTLHoutputtransitiontimensFigsandSeptemberPhilipsSemiconductorsProductspecificationtolinedecoderdemultiplexerinvertingHCHCTDCCHARACTERISTICSFORHCTFortheDCcharacteristicssee“HCHCTHCUHCMOSLogicFamilySpecifications”Outputcapability:standardICCcategory:MSINotetoHCTtypesThevalueofadditionalquiescentsupplycurrent(∆ICC)foraunitloadofisgiveninthefamilyspecificationsTodetermine∆ICCperinput,multiplythisvaluebytheunitloadcoefficientshowninthetablebelowACCHARACTERISTICSFORHCTGND=Vtr=tf=nsCL=pFINPUTUNITLOADCOEFFICIENTAnEnESYMBOLPARAMETERTamb(°C)UNITTESTCONDITIONSHCTVCC(V)WAVEFORMS−to−tomintypmaxminmaxminmaxtPHLtPLHpropagationdelayAntoYnnsFigtPHLtPLHpropagationdelayEtoYnnsFigtPHLtPLHpropagationdelayEntoYnnsFigtTHLtTLHoutputtransitiontimensFigsandSeptemberPhilipsSemiconductorsProductspecificationtolinedecoderdemultiplexerinvertingHCHCTACWAVEFORMSPACKAGEOUTLINESSee“HCHCTHCUHCMOSLogicPackageOutlines”FigWaveformsshowingtheaddressinput(An)andenableinput(E)tooutput(Yn)propagationdelaysandtheoutputtransitiontimes()HC:VM=VI=GNDtoVCCHCT:VM=VVI=GNDtoVFigWaveformsshowingtheenableinput(En)tooutput(Yn)propagationdelaysandtheoutputtransitiontimes()HC:VM=VI=GNDtoVCCHCT:VM=VVI=GNDtoV

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