NUMERO3-Tkool Electronics

Tkool Electronics

IntroductionAcircuitordevicethatchangesthephaseofasignalby180,asrequiredforfeedingapush-pullamplifierstagewithoutusingacouplingtransformer,orforchangingthepolarityofapulse;atriodeiscommonlyusedasaphaseinverter.Alsoknownasinverter.Thefollowingisanintroductionto74LS04andothersimilarICchips.CatalogIntroductionI74LS04VS.74LS141.1BriefIntroduction1.2Differencebetween74LS04and74LS14II74LS04VS.74LS08III74LS04VS.74HC04IV74LS04VS.54LS04FAQOrdering&QuantityI74LS04VS.74LS141.1BriefIntroductionBoth74LS04and74LS14arenotgatesofthe74series.74LS04isaHexInverter.74LS14isaHexSchmidttrigger.The74LS04gatecircuithasathresholdvoltage.Whentheinputvoltagerisesfromthelowleveltothethresholdvoltage,ordecreasesfromthehighleveltothethresholdvoltage,theconditionofthecircuitwillchange.74LS14isaSchmidttrigger.Itisaspecialgatecircuit,whichisnotcompatiblewiththesimplegatecircuit.Schmidttriggerhastwothresholdvoltages(positivethresholdvoltageandnegativethresholdvoltage).1.2Differencebetween74LS04and74LS14◾Output:Theoutputof74LS04and74LS14arethesame.Ifthesamemanufacturer,theoutputparametersarethesame.◾Input:Thedifferencebetweenthetwoisthattheinputisnotthesame.74LS04inputisTTLlevel,while74LS14inputisSchmidtinput(withhysteresischaracteristics).Becausetheinputisdifferent,theapplicationofthetwochipsisalsodifferent.74LS04ismostlyusedfornoncontrolofgeneraldataontheboard,while74LS14isgenerallyusedforsignalshapingorsignalbufferingofcriticalsignals.Inmostcases,74LS14canreplace74LS04.II74LS04VS.74LS08The74LS08devicecontains4independent2-inputANDgates.Thelogicfunctionexpressionof74LS08is:Y=ABorY=/(A+B),positivelogic.74LS08iscommonlyusedindigitalcircuitsystems.74LS0474LS08VCC(Min)(V)4.754.75VCC(Max)(V)5.255.25LogiclevelTTLTTLPin/Package14PDIP,14SO,14SOIC,14SSOPPDIP14,SOIC14,SOP14,SSOP14III74LS04VS.74HC0474HC04isahexinverterofCMOScircuit,andtheworkingvoltageis2V-6V.Both74LS04and74HC04areinverters,butLSstandsforlow-powerSchottkyandHCishigh-speedCOMS.LSisslightlyfasterthanHC.LSadoptsTTLlevel.HCisCMOSlevel.74HC04iseasytounderstand.Inputlowlevel,outputhighlevel.Inputhighlevel,outputlowlevel.74LS04containssixindependentgateseachofwhichperformsthelogicINVERTfunction.Theoutputsignalsofthesixinvertersareoppositetotheinputsignals.Theinvertercanreversethephaseoftheinputsignalby180degrees.Thiscircuitisusedinanalogcircuits,suchasaudioamplifier,clockoscillator,etc.IV74LS04VS.54LS0454LS04containssixindependentinverters.Itischaracterizedforoperationoverthefullmilitarytemperaturerangeof-55℃to125℃.74LS0454LS04TechnologyFamilyLSLSVCC(Min)(V)4.754.5VCC(Max)(V)5.255.5Bits(#)66Voltage(Nom)(V)55F@NomVoltage(Max)(Mhz)3535ICC@NomVoltage(Max)(mA)0.0330.033tpd@NomVoltage(Max)(ns)2222IOL(Max)(mA)88IOH(Max)(mA)-0.4-0.4SchmittTriggerNoNoRatingCatalogMilitaryOperatingTemperatureRange(C)0to70-55to125Pin/Package14PDIP,14SO,14SOIC,14SSOP14CDIP,14CFP,20LCCCFAQWhatis74LS04?74LS04isamemberof74XXYYICseries.The74-seriesaredigitallogicintegratedcircuits.74LS04IChassixNOTgates.TheseNOTgatesperformInvertingfunction.HencenameHEXINVERTINGGATES.Whatisthefunctionofic74ls04?74LS04HexNOTGateIC.74LS04isa2inputquadruple8-bitNOTgateIC.InverterinlogicconvertersisanelectronicsdevicewhosebasicfunctionsaretoinverttheincominglogicweatheritisHIGHorLOW.TheyarealsoknownasNOTgates.Whatisahexinverter?Ahexinverterisatypeofanintegratedcircuitthatcontainssixinverters.Manysophisticateddigitaldevicesuseinverters,includingmultiplexers,decoders,andstatemachines.Aninvertercircuitsmainfunctionistooutputthevoltagerepresentingtheoppositeleveltoitsinput.WhyisNOTgatecalledaninverter?ANOTgate,oftencalledaninverter,isanicedigitallogicgatetostartwithbecauseithasonlyasingleinputwithsimplebehavior.ANOTgateperformslogicalnegationonitsinput.Inotherwords,iftheinputistrue,thentheoutputwillbefalse.