《ttl系列芯片手册74502》

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1、DM54LS502/DM74LS5028-BitSuccessiveApproximationRegisterApril1992DM54LS502/DM74LS5028-BitSuccessiveApproximationRegisterGeneralDescriptionTheLS502isan8-bitregisterwiththeinterstagelogicnec-Designedprimarilyforuseinthesuccessiveapproximationessarytoperformserial-to-p

2、arallelconversionandprovidetechniqueforanalog-to-digitalconversion,theLS502cananactiveLOWConversionComplete(CC)signalcoincidentalsobeusedasaserial-to-parallelconverterringcounterwithstorageoftheeighthbit.AnactiveLOWStart(S)inputandasthestorageandcontrolelementinrec

3、ursivedigitalperformssynchronousinitializationwhichforcesQ7LOWroutines.andallotheroutputsHIGH.SubsequentclocksshiftthisQ7LOWsignaldownstreamwhichsimultaneouslybackfillstheFeaturesregistersuchthatthefirstserialdata(Dinput)bitisstoredinYLowpowerSchottkyversionof2502Q

4、7,thesecondbitinQ6,thethirdinQ5,etc.TheserialYStorageandcontrolforsuccessiveapproximationAtoinputdataisalsosynchronizedbyanauxiliaryflip-flopandDconversionbroughtoutonQD.YPerformsserial-to-parallelconversionConnectionDiagramLogicSymbolDual-In-LinePackageTL/F/10189±

5、2VCCePin16GNDePin8TL/F/10189±1OrderNumberDM54LS502J,DM54LS502W,DM74LS502WMorDM74LS502NSeeNSPackageNumberJ16A,M16B,N16EorW16APinDescriptionNamesDSerialDataInputSStartInput(ActiveLOW)CPClockPulseInput(ActiveRisingEdge)QDSynchronizedSerialDataOutputCCConversionComplet

6、eOutput(ActiveLOW)Q0±Q7ParallelRegisterOutputsQ7ComplementofQ7OutputC1995NationalSemiconductorCorporationTL/F/10189RRD-B30M105/PrintedinU.S.A.AbsoluteMaximumRatings(Note)IfMilitary/Aerospacespecifieddevicesarerequired,Note:The``AbsoluteMaximumRatings''arethosevalue

7、spleasecontacttheNationalSemiconductorSalesbeyondwhichthesafetyofthedevicecannotbeguaran-Office/Distributorsforavailabilityandspecifications.teed.Thedeviceshouldnotbeoperatedattheselimits.TheSupplyVoltage7Vparametricvaluesdefinedinthe``ElectricalCharacteristics''ta

8、blearenotguaranteedattheabsolutemaximumratings.InputVoltage7VThe``RecommendedOperatingConditions''tablewilldefineOperatingFreeAirTemperatureRange