NOR Gate: Symbol, Truth Table, Circuit Diagram ...

NOR gate indicates NOT+OR gate hence the output of this logic gate is exactly the reverse to that of an OR gate. We have seen in the OR gate ... 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»DigitalElectronicsNORGate:Symbol,TruthTable,CircuitDiagramwithDetailedImagesandmoreNileshKodag |Updated:Aug8,202123:58IST 0  Save DownloadPostasPDF TheNORgateisalsoauniversalgatesimilartotheNANDgate.Therefore,wecanalsocreateallthebasicgatesemployingtheNORgate.TheNORgateistheunionoftheNOTandtheORgate.TheoutputstateoftheNORgatewillbehighonlywhenalloftheinputsarelow.Simply,thisgatedeliversthecomplementresultoftheORgate.ThroughthisarticleonNORgates,youwilllearnaboutthesymbol,truthtableoftwoandthreeinputgates,alongwiththebooleanexpression,circuitdiagramandrepresentationofvariousothergatesusingNORgates.ChecktheEx-NORGate,here.NORGateSymbolTheNORgatehasanoutputthatisnormallyatlogichighandonlygoeslogiclowwhenanyofitsinputsareatlogichigh.TheLogicNORGateperformsthereverseorcomplementaryoperationoftheORgate.Itmayhavetwoormoreinputsandanoutput.ThesymbolicrepresentationoftwointoNORGateisasfollows.NORGateTruthTableNORgateindicatesNOT+ORgatehencetheoutputofthislogicgateisexactlythereversetothatofanORgate.WehaveseenintheORgatethattheoutputiszeroonlywhenallinputsoftheORgatearezero.ThereforeinthecaseoftheNORgate,theoutputislogiconeonlywhenallinputsarelogiczero. Forallothertypesofcombinationsofinputs,theoutputislogiczero.IntwoinputNORGate,thereareonlytwoinputvaluesandanoutputvalue.Thereareatotalof4possiblecombinationsofinputs.Belowisthetruthtableforthetwo-inputNORgate.NORgatebooleanexpressionfortwoinputis:Y=\(\overline{A+B}=\overline{A}\overline{B}\)LearnaboutvarioustypesofComputerStorageDeviceshere.3InputNORGateTruthTableAsthenamesignifiesthatthe3-inputNORgatehasthreeinputs.TheBooleanexpressionofthelogicNORgateisrepresentedasthebinaryoperationaddition(+)followedbyitscomplement.ThesymbolicrepresentationofthreeinputNORgatesisasfollows: Y=\(\overline{A+B+C}=\overline{A}\\overline{B}\\overline{C}\)TheNORgatecanbecascadedtogethertoformanynumberofindividualinputs.Thereareatotalof8possiblecombinationsofinputsforathree-inputNORgate.Thetruthtableandisshownbelow:CheckthevarioustypesofInputandOutputDeviceshere.NORGateCircuitDiagramAsimpletwo-inputlogicNORgatecanbeassembledusingaResistor-transistorconnectedtogetherasexplainedbelowwiththeinputsconnecteddirectlytothetransistorbases.Bothtransistorsneedtobecut-off“OFF”foroutputtobelogichigh. Belowisthetruthtableforbetterunderstanding:ABQ1Q2Output00OFFOFF101OFFON010ONOFF011ONON0ReadmoreANDGate,here.RealizationofBasicGatesusingNORGateThebelowimageshowstherealizationofbasicgatesusingNORgates,thesamecanbedonefortheUniversalandSpecialpurposegates.ShortcutForRealizationofLogicGatesUsingNORGateNumberofNORGates OtherGates1NOTGate3ANDGate2OR Gate5EX-ORGate4EX-NORGateNORGateICGenerallyavailableNANDgateIC’sinclude:TTLLogicNORGates->74LS02Quad2-input,74LS27Triple3-input,7425Dual4-inputNORgateand74LS260Dual5-input.CMOSLogicNORGates->CD4001Quad2-input,CD4025Triple3-inputandCD4002Dual4-input.KeyPointsNORgatefollowsCommutativebutdoesnotfollowAssociativelaw.\(\overline{A+B}=\overline{B+A}\)Inamultiple-inputNORgate,theunusedinputscanbeconnectedinthesamewayasinaNORgate.TheNORgateisequivalenttotheORgatewithinvertedinputsandcanberealizedbyabubbledANDgate.TheNORgateisalsocalledtheactivelowANDgate.CheckmoretopicsofDigitalElectronicshere.TheabovearticleonNORGateisintendedtoguidestudentswithrelevantinformation.Formore,downloadandinstalltheTestbookApporvisitthetestbookwebsiteformoreupdatesonsimilartopicsfromDigitalElectronicsandnumeroussuchsubjects,andcanevencheckthetestseriesavailabletotestyourknowledgeregardingvariousexams. NORGateFAQsQ.1 WhereistheNORgateused?Ans.1NORgateisthelogicgateandcomesunderoneoftheuniversalgateswiththeNANDgate.NORgateisappliedtoconstructthebasicgatessimilartoANDgate.Q.2 WhatdoesNORgaterepresent?Ans.2TheBooleanexpressionforalogicNORgateisindicatedbyaplussign,(+)withalineorOverline,(‾)overtheexpressiontoimplytheNOTorlogicalnegationoftheNORgate.Q.3 WhatisthedifferencebetweenNANDandNORgates?Ans.3ThebasicdifferencebetweenNANDandNORgateisthat;NANDgateoutputislogicallyoppositetothatofANDgatewhereastheoutputoftheNORgateislogicallyoppositeofanORgate.Q.4 HowmanyNORgatesarerequiredforanANDgate?Ans.4ThenumberoflogicgatesrequiredtobuildanANDgateis3.Q.5 WhatistheothernameforNORgate?Ans.5ANORgateisalsoreferredtoasNegatedORgateastheoutputofNORgateislogicallyoppositeofanORgate.  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