Tkool Electronics

I.74HC164Introduction74HC164adoptsDIP-14,SO-14,SSOP-14andTSSOP-14packagepinconfiguration.ItiscomplementarytoMOS8-bitserialinputandparalleloutputunidirectionalshiftregister,thelogicsymbolisshowninthefigure1.Thepowersupplyvoltageis2~6V.Inthefigure1,AandBaretheserialcodeinputterminals;CLRistheclearinputterminal;CLKistheclockpulseinputterminal.Withthearrivaloftherisingedgeoftheclockpulse,thestateofphaseA,phaseBandthesubsequentphaseshiftsfromQAtoQHinturn.CatalogI.74HC164IntroductionII.74HC164LogicSymbolIII.CircuitDesignIV.HowtoCheckandRepairtheCircuitFAQOrdering&QuantityII.74HC164LogicSymbolFigure174HC164LogicSymbolIII.CircuitDesignFigure2isaninstrumentcircuitcomposedofserialinputandparalleloutputdigitalintegratedcircuits.T2-T5,C5andresistancetogetherformaturnsignalflashingoscillationcircuit.WhentheDR(connectedtotheturnswitch)inJ8isdisconnected,thiscircuitwillnotworkandtheturnsignalwillnotflash;whenDRison,theoscillationcircuitstarttowork,theturnsignalstartstoflash.Figure2MetercircuitdiagramDRisathree-positionswitch,onepoleisconnectedtotheleftturnsignal,onepoleisconnectedtotherightturnsignal,onepoleissuspendedintheair,andtheotherendofthepolehitstheground.Theswitch-offcircuitiscomposedofTl,DLRllandR12.Aswitch-typeHallelementisinstalledinthefrontandrearbrakesoftheelectricbicycle.Whentheswitchisswitched,theHallelementoutputsalowpotential,thatis,theBRKterminalintheplugJ2isgrounded,Tlisturnedon,andthereisavoltageofnearly5VonthecollectorofTl.ThisvoltageissenttothecontrollerthroughtheBRKterminalinJ2,andthepowersupplycircuitofthemotoristurnedoff.Themotorstopsworkingandactsasabrake.Onthecontrary,whenthebrakeisnotpinched,theHallelementoutputsahighpotential,Tliscutoff,andthemotorrunsnormally.Because74HC164isan8-bitserialinputandparalleloutputshiftregister,itformsamovementmodeandbatterypowerdisplaycircuitwithlight-emittingdiodes.74HC164soutputpin13,pin11,andD5-D7formthesideofthesportsmodedisplaycircuit,andpins6and10andD8-D12formthebatterypowerdisplaycircuit.Thedisplaysignalfromthecontrollerissenttotheserialinputterminals1and2ofthe74HC164throughtheDATAterminalintheJ2,andthenshiftedbytheinternalcircuit,thedrivingsignalisoutputfromtherelevantoutputterminaltolightupthecorrespondinglight-emittingdiode,soastocompletethecontrolofthedisplaycircuit.IV.HowtoCheckandRepairtheCircuitThiscircuitisrelativelysimpleandeasytorepair.Themainbasisforrepairingistojudgethequalityof74HC164.First,checkwhetherthe+5Vvoltageisnormal,andthencheckwhetherthevoltageatpin③ofthe74HC164sclocksignalinputiscloseto+5V.Ifitislowerthan+5V,andafterdisconnectingR73,theCLKterminalvoltageofJ2isnormal,andthe74HC164isdamaged.IfthevoltageoftheCLKportisabnormal,thefaultisinthecontroller.Next,measurewhetherthevoltageoftheserialinputterminals①and②changesduringthetransitionofthemotionmode.Ifnot,thefaultisinthecontroller;ifthereis,the74HC164isdamaged.Fromtheactualrepairsituation,mostofthe74HC164failuresarecausedbydamagetotheinternalcircuitofthe⑩pin(powersupplyterminal).Inaddition,whenpurchasing74HC164,youcanfirstmeasuretheresistanceofthe⑩pin.Theresistancevalueshouldbeabout4kDinthepositivetestandinfiniteinthereversetest.FAQHowdoesthe74HC164transmitdatainthemicrocontrollercircuit?Onepinofthesingle-chipmicrocomputerislikeafaucet,andthedataissentonebyone,thatis,likethewaterfromthefaucet,drippingdropbydrop.The74H164islikeasmallbowlreceivingwater.Itisjustfullafterreceiving8dropsofwater.Atthistime,itissenttothedigitaltube.Thesingle-chipmicrocomputermustsendan8-bit(ormore)data,ifitissentatthesametime,itisaparalleltransmission,ifitisabitbybit,itisaserialtransmission.Thedataofthesingle-chipmicrocomputerissenttothe74HC164bitbybit,whichisserial,andthe74HC164sendsthedatatothedigitaltubeatonce,whichisparallel.So74HC164playsarolefromserialtransmissiontoparalleltransmission.Whatisthedifferencebetween74HC164Dand74HC164NMCU?TheDin74HC164Drepresentsachippackage.TheNin74HC164Nmeansdualin-lineplasticpackaging.Whatisthedifferencebetween74HC164and74LS164,cantheybeusedtogether?74ls164isaTTLcircuit,thepowersupplyvoltageis5V,thehigh-leveloutputcurrentIohis-0.4MA,andthelow-leveloutputcurrentis8MA.74HC164isaCMOScircuit,thepowersupplyvoltageis2V~6V,theoutputdrivecurrentcanreachplusorminus20MA.Ifthepowersupplyvoltageyouuseis5Vandtheoutputdrivecurrentissuitablefor74ls164,theycanbeusedtogether.Whatdevicescan74hc164bereplacedwith?74HC164isaCMOSdevicewithapowersupplyvoltageof2V-6V.Itcanbedirectlyreplacedby74HCT164,40H164.Ifthepowersupplyvoltageis5Vandtheoutputdrivecurrentissmall,itcanalsobereplacedby74164,74LS164,74F164,74ALS164.Whichof74LS164and74HC164hashigherdrivingcapability?74LS164isaTTLdevicewithahigh-leveldrivingcapabilityofabout0.4mAandalow-leveldrivingcapabilityofabout8mA.74HC164isaCMOSdevice,withhigh-levelandlow-leveldrivecapabilityupto20mA.TheabovedatacomesfromDATASHEET.Butgenerallyspeaking,thehigh-leveloutputcapabilityofmanyCMOSdevicesisweak,smallerthanTTL,andthelow-leveldrivecapabilityisstronger.Can74hc164nbeusedtodrivethedigitaltube?Ofcourse,youcanusethe164chiptodrivethenixietube,whichismostlyusedinsituationswheretheIOportresourcesaretightandthedisplaydatarefreshofthenixietubeisslow.Whendesigningthecircuit,multiple164chipsareusedincascade,nomatterhowmanydigitaltubesaredriven,only2IOportsofthesingle-chipmicrocomputerareoccupied.ItcanbesaidthatitisthemostIOport-savingdrivingmethod,anditisstilldrivenstatically,withoutstrobeandbrightnessLowphenomenon.Thedisadvantageisthatmultiple164sareusedincascadeconnection,whichwillcausethesingle-chipmicrocomputertosendalargeamountofdisplaydata(1bytepernixietube)atonetimewhenrefreshingthedisplaydata.Duringthisprocess,thenixietubewillbeallon,althoughthedataissentTheprocessdurationisveryshort,butitstillaffectsthedisplayeffect.Itisrecommendedtoturnoffthedigitaltubewhenrefreshingthedata.

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