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54LS192/DM74LS192Up/DownDecadeCounterwithSeparateUp/DownClocksMay199254LS192/DM74LS192Up/DownDecadeCounterwithSeparateUp/DownClocksGeneralDescriptionThe'LS192isanup/downBCDdecade(8421)counter.SeparateTerminalCountUpandTerminalCountDownout-SeparateCountUpandCountDownClocksareusedandinputsareprovidedwhichareusedastheclocksforasubse-eithercountingmodethecircuitsoperatesynchronously.quentstagewithoutextralogic,thussimplifyingmultistageTheoutputschangestatesynchronouswiththeLOW-to-counterdesigns.IndividualpresetinputsallowthecircuitstoHIGHtransitionsontheclockinputs.beusedasprogrammablecounters.BoththeParallelLoad(PL)andtheMasterReset(MR)inputsasynchronouslyoverridetheclocks.ConnectionDiagramLogicSymbolDual-In-LinePackageTL/F/10178±2VCCePin16GNDePin8TL/F/10178±1OrderNumber54LS192DMQB,54LS192FMQB,54LS192LMQB,DM74LS192MorDM74LS192NSeeNSPackageNumberE20A,J16A,M16A,N16EorW16AModeSelectTablePinNamesDescriptionMRPLCPCPModeCPUCountUpClockInputUD(ActiveRisingEdge)HXXXReset(Asyn.)CPDCountDownClockInputLLXXPreset(Asyn.)(ActiveRisingEdge)LHHHNoChangeMRAsynchronousMasterResetInputLHLHCountUp(ActiveHIGH)LHHLCountDownPLAsynchronousParallelLoadInputHeHIGHVoltageLevel(ActiveLOW)LeLOWVoltageLevelP0±P3ParallelDataInputsXeImmaterialQ0±Q3Flip-FlopOutputsTCDTerminalCountDown(Borrow)Output(ActiveLOW)TCUTerminalCountUp(Carry)Output(ActiveLOW)C1995NationalSemiconductorCorporationTL/F/10178RRD-B30M105/PrintedinU.S.A.AbsoluteMaximumRatings(Note)IfMilitary/Aerospacespecifieddevicesarerequired,Note:The``AbsoluteMaximumRatings''arethosevaluespleasecontacttheNationalSemiconductorSalesbeyondwhichthesafetyofthedevicecannotbeguaran-Office/Distributorsforavailabilityandspecifications.teed.Thedeviceshouldnotbeoperatedattheselimits.TheSupplyVoltage7Vparametricvaluesdefinedinthe``ElectricalCharacteristics''tablearenotguaranteedattheabsolutemaximumratings.InputVoltage7VThe``RecommendedOperatingConditions''tablewilldefineOperatingFreeAirTemperature
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