74ls193-datasheet

©2000FairchildSemiconductorCorporationDS006406(ripple-clock)counters.Theoutputsofthefourmaster-slaveflip-flopsaretriggeredbyaLOW-to-HIGHleveltransitionofeithercount(clock)input.ThedirectionofcountingisdeterminedbywhichcountinputispulsedwhiletheothercountinputisheldHIGH.Thecounterisfullyprogrammable;thatis,eachoutputmaybepresettoeitherlevelbyenteringthedesireddataattheinputswhiletheloadinputisLOW.Theoutputwillchangeindependentlyofthecountpulses.Thisfeatureallowsthecounterstobeusedasmodulo-Ndividersbysimplymodi-fyingthecountlengthwiththepresetinputs.Aclearinputhasbeenprovidedwhich,whentakentoahighlevel,forcesalloutputstothelowlevel;independentofthecountandloadinputs.Theclear,count,andloadinputsarebufferedtolowerthedriverequirementsofclockdrivers,etc.,requiredforlongwords.Thesecountersweredesignedtobecascadedwithouttheneedforexternalcircuitry.Bothborrowandcarryoutputsareavailabletocascadeboththeupanddowncountingfunctions.Theborrowoutputproducesapulseequalinwidthtothecountdowninputwhenthecounterunderflows.Similarly,thecarryoutputproducesapulseequalinwidthtothecountdowninputwhenanoverflowconditionexists.Thecounterscanthenbeeasilycascadedbyfeedingtheborrowandcarryoutputstothecountdownandcountupinputsrespectivelyofthesucceedingcounter.Features■Fullyindependentclearinput■Synchronousoperation■Cascadingcircuitryprovidedinternally■Individualpreseteachflip-flopOrderingCode:ConnectionDiagramOrderNumberPackageNumberPackageDescriptionDM74LS193MM16A16-LeadSmallOutlineIntegratedCircuit(SOIC),JEDECMS-012,0.150”NarrowBodyDM74LS193NN16E16-LeadPlasticDual-In-LinePackage(PDIP),JEDECMS-001,0.300”Wide:Whencountingup,count-downinputmustbeHIGH;whencountingdown,count-upinputmustbeHIGH.(Note1)Note1:The“AbsoluteMaximumRatings”arethosevaluesbeyondwhichthesafetyofthedevicecannotbeguaranteed.Thedeviceshouldnotbeoperatedattheselimits.TheparametricvaluesdefinedintheElectricalCharacteristicstablesarenotguaranteedattheabsolutemaximumratings.The“RecommendedOperatingConditions”tablewilldefinetheconditionsforactualdeviceoperation.RecommendedOperatingConditionsNote2:CL=15pF,RL=2kΩ,IA=25°CandVCC=5V.Note3:CL=50pF,RL=2kΩ,IA=25°CandVCC=5V.Note4:TA=25°CandVCC=5V.DCElectricalCharacteristicsNote5:AlltypicalsareatVCC=5V,TA=25°C.Note6:Notmorethanoneoutputshouldbeshortedatatime,andthedurationshouldnotexceedonesecond.Note7:ICCismeasuredwithalloutputsopen,CLEARandLOADinputsgrounded,andallotherinputsat4.5V.OperatingFreeAirTemperatureRange-0°Cto+70°CSupplyVoltage7VInputVoltage7VStorageTemperatureRange-65°Cto+125°CSymbolParameterMinNomMaxUnitsVCCSupplyVoltage4.7555.25VVIHHIGHLevelInputVoltage2VVILLOWLevelInputVoltage0.8VIOHHIGHLevelOutputCurrent-0.4mAIOLLOWLevelOutputCurrent8mAfCLKClockFrequency(Note2)025MHzClockFrequency(Note3)tWPulseWidthofanyInput(Note4)20nstSUDataSetupTime(Note4)20nstHDataHoldTime(Note4)0nstENEnableTimetoClock(Note4)40nsTAFreeAirOperatingTemperature070°CSymbolParameterConditionsMinTypMaxUnits(Note5)VIInputClampVoltageVCC=Min,II=-18mA-1.5VVOHHIGHLevelOutputVCC=Min,IOH=Max2.53.4VVoltageVIL=Max,VIH=Min2.73.4VOLLOWLevelOutputVCC=Min,IOL=Max0.250.4VoltageVIL=Max,VIH=Min0.350.5VIOL=4mA,VCC=Min0.250.4IIInputCurrent@MaxInputVoltageVCC=Max,VI=7V0.1mAIIHHIGHLevelInputCurrentVCC=Max,VI=2.7V20μAIILLOWLevelInputCurrentVCC=Max,VI=0.4V-0.4mAIOSShortCircuitVCC=Max-20-100mAOutputCurrent(Note6)-20-100ICCSupplyCurrentVCC=Max(Note7)1934mA5(Input)RL=2kΩSymbolParameterTo(Output)CL=15pFCL=50pFUnitsMinMaxMinMaxfMAXMaximumClockFrequency2520MHztPLHPropagationDelayTimeCountUp2630nsLOW-to-HIGHLevelOutputtoCarrytPHLPropagationDelayTimeCountUp2436nsHIGH-to-LOWLevelOutputtoCarrytPLHPropagationDelayTimeCountDown2429nsLOW-to-HIGHLevelOutputtoBorrowtPHLPropagationDelayTimeCountDown2432nsHIGH-to-LOWLevelOutputtoBorrowtPLHPropagationDelayTimeEitherCount3845nsLOW-to-HIGHLevelOutputtoAnyQtPHLPropagationDelayTimeEitherCount4754nsHIGH-to-LOWLevelOutputtoAnyQtPLHPropagationDelayTimeLoadto4041nsLOW-to-HIGHLevelOutputAnyQtPHLPropagationDelayTimeLoadto4047nsHIGH-to-LOWLevelOutputAnyQtPHLPropagationDelayTimeClearto3544nsHIGH-to-LOWLevelOutputAnyQ(millimeters)unlessotherwisenoted16-LeadSmallOutlineIntegratedCircuit(SOIC),JEDECMS-012,0150”NarrowBodyPackageNumberM16APhysicalDimensionsinches(millimeters)unlessotherwisenoted(Continued)7