74LS02 Quadruple 2-Input NOR Gate IC - Microcontrollers Lab

IC 7402 comes up in multiple packages with 14 pins and 2 inputs 4-NOR gates. NOR gate is designed with advanced technology based on silicon. IC 74LS02 internal ... 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Menu74LSICseriescomesupwithmultiplegates.ItprovidesuswithcompactdesignandmultiplepackagesofthesameIC.Herewewilldiscuss74LS02.74LS02alsoknowas7402.ITcomesupwith4internalNORgate.IC7402comesupinmultiplepackageswith14pinsand2inputs4-NORgates.NORgateisdesignedwithadvancedtechnologybasedonsilicon.IC74LS02internalstructurebasedonCMOStechnology.InICallgatescomeupwithbufferedoutputandithastheabilitytoprovidenoiseimmunitytodriveLS-TTLLoads.TableofContentsIntroductionto74LS0274LS02pindiagramPINCONFIGURATIONQuad2inputNANDGate  74LS02FEATURESNORGateWorking  NORGateTruthTable74LS04CONVERSIONtootherGATESHowtouse74LS0474LS04ICAPPLICATIONS SPECIFICATIONS RELIABILITY 2DDiagram74LS02DateSheet74LS02Introductionto74LS02TheICisfunctionalwithallother74LSlogicfamilyanditcanbeoperatingwithanymicrocontrollerorICduetoitslowoutputcompatibility.Theinterfacewithotherdevicesdoesn’trequireanyencoderordecoder.Mostofthedevicescomeupwith74LS02duetoitscheapnessandfastspeed.ItispossibletodesigntheotherAND,ORandNOTgatewith74LS02.ThisICalsocomesupwithinternalprotectionfromdischargeusingclampdiodes,whichkeepitprotectedfromanyinternalvoltageleakageactivity.74LS02pindiagramThisfigureshowsthepinoutof74LS02NORgateIC.PINCONFIGURATIONQuad2inputNANDGate PINSDESCRIPTION1YPin1Pin1isrepresentingthefirstpinofICandfirstOUTPUTofIC.1APin2HerePin2isrepresentingthefirstpinofICandthesecondpinofFirstNORgate.ItsstatewillaffecttheoutputoffirstNORgate.1BPin3Pin3willbethesecondinputofthefirstNORgate.2YPin4Pin4willbeusedastheoutputofsecondNORgate.2APin5Pin5isaninputpin.ItisusedasthefirstinputofthesecondNORgateintheIC.2BPin6Pin6isthesecondinputPinoftheSecondNORgateinIC.GNDPin7Pin7willbeusedasthecommongroundbyallthedevicesandpowersupplyusedwiththeICtomakethegroundcommon.3APin8Pin8willbeusedastheFirstinputpinofthethirdNORgateinIC74LS02.3BPin9Pin9willbethesecondinputpinofthethirdNORgateinIC.3YPin10Pin10willbeusedastheoutputpinforthe3rdNORgate.4APin11Pin11willbeusedasthefirstinputpinofthelastandfourthNORgateoftheIC.4BPin12Pin12willbeusedasthesecondinputpinofthefourthNORgateintheIC.4YPin13Pin13willbeusedastheoutputpinforthefinalNORgateoftheIC.VccPin14Pin14willbeusedasapowerpintomaketheICfunctional. 74LS02FEATURESItcanbeusedtodesignothergatesIC74LS02comesupinmultiplepackages,SOIC,SOPandPDIP.ThesingleIChasfourgatesthatoperateonasinglepowersupplypin.ICoutputsalwayscomeinTTL.ItisduestoitsinternalstructurebasedonCMOS.Ithasinternalprotectionfromdischarging.IthasalowpowerconsumptionNORGateWorking  NORgateuseinmultiplefunctionsbuttounderstanditworkingwehavetounderstanditsstructure.TheNORgatecomesupwiththecombinationofORandNotgate.Thecombinationsofbothgatesusefivetransistors4resistorsandtwodiodes.Thediodesareusedtocontroltheonesidecurrentflowandtransistorsandresistorsareusedasswitching.Thefirsttwotransistorsareattachedtofurthertransistorseach,whichgivestheoutputtoanothertransistor.Thatmakesatotalofthreetransistorsforasingleinput.First,two-transistordonothaveanyeffectontheotheruntiltheyattachtothethirdtransistor.Wheneverthefirsttwo-transistorwillbeusedasinputandtheygetaHIGHstatethentheyHIGHstatewillbegiventothethirdtransistor.Thetransistorwillworkasaninverterornotgate.TheHIGHinputwillallowthethirdtransistortogivetheLOWoutputandLOWinputonthethirdtransistorwillgivetheHIGHoutput.ThiswholecombinationwillmakethecircuitoftheNORgate.Thecircuitwillfollowthefollowingformula:(A+B)’=OUTPUT.NORGateTruthTableTheIC74LS02willneedonlytwopowertogetintheworkingstate.JustapplypowerthenconnectitwithanyTTLdevicestartusingit.Everysinglegatewillfollowthefollowingtruthtable.INPUTOUTPUTAB00101010011074LS04CONVERSIONtootherGATESNORgatecanbeusedtoconvertIntoothergates.First,wewillconvertthenorgatetoNOTgate.TheNOTgatecanbemadefromtheNORgatejustbycombiningitsinputs.ThentheNORgatecanbeusedasNOTgate.ToconverttheNORtoORgatewewilljusthavetoattachtheNOTgateattheendofNOTgate,withthatmethodNORgatewillstartactingasORgate.ToConverttheNORtoANDgatejustattachtwoNOTgatemadebyusingNOTgateattheinput.ThentheNORgatewillstartgivingtheoutputasANDgateandjustbyattachingtheNOTgateattheendofANDgateitcanbeusedasNANDgate.HereisthesymbolicmethodtoconverttheNORgatetotheNANDgate.Howtouse74LS04HerewewillusetheIC74LS02inProteustounderstandtheNORgateoutputbyusinglogicstates.WewillconverttheonegateasNOTgateandotherTwoasNANDgate.Thegivetheinputandchecktheoutputaccordingtothegiveninstructions.NowwewillapplytheinputonNOTgatemadebyNORgateandseetheoutput.YoumaynoticethattheinputvalueisinvertedandOUTPUTisone.Nowwewilldothesamewiththeotherfourgates.Justapplytheinput1and0.Theoutputwillbe0incaseofANDgateotherwiseitwillbe1inORgate.HereyoumaynoticethatORgateisfullyeasytoworkwilllikeothergates.Inproteus,thesymbolsaredifferentforsomedeviceforbetterunderstandingbuttheirfunctionalityisthesame.WheneverweneedtoworkwithNORgateIC,wewilljustuseitlikeotherIC.TheSizeofICmaybesmallinrealbuttheirspeedofworkwillalwaysbebettermorethanitssize.74LS04ICAPPLICATIONS NORgatecanbeusedasageneraluseofNORlogic.InDigitalElectronics,ServerandmanyALUsalsocome withNORgate.NORgatehaswideuseinMemoryunits.NetworkingneedsNORgatesforsomeoperations.SPECIFICATIONS TheoperatingvoltagefortheICI+4.75to+5.25.TheSupplycouldbeextendedto7V.Themaximumcurrentcandrawfromtheoutputofthegateis8mA.ThemaximumESDprotectionrangeforICis3.5KV.ThetypicalriseandfalltimeforICisabout15ns.TheICoperatingtemperatureisfrom0to70degreeanditsstoragetemperaturerangeis-65to150degrees.RELIABILITY TheICcomesupfourinternalNORgateswhichcostlessthanmakingasingleNORgate.ThesingleNORgatecanthegate’soutputatthesametime,insteadofusingthemall.TheICcanbeusedtodesignothergates.AsingleNOT,AND&ORgatecanbedesignedbyusingthefourgates.Thechipoperatesathighspeed.ThechipisdesignedbySchottkytransistorswhichminimizetheswitchingdelays.TheICgivesoutputinTTLstates,whichmakesitworkablewithothersystems.2DDiagram74LS02Alldimensionsaregiveninches.DateSheet74LS02DownloaddatasheetSubscribetoBlogviaEmailEnteryouremailaddresstosubscribetothisblogandreceivenotificationsofnewpostsbyemail.EmailAddress 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