NOT Gate: Symbol, Truth Table, Waveform and Circuit Diagram

A NOT gate is a single input- and single output gate often called an “inverter”. A NOT gate performs logical negation on its input i.e if the ... 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»DigitalElectronicsNOTGate:Symbol,TruthTable,WaveformandCircuitDiagramNileshKodag |Updated:Aug18,202121:19IST 0  Save DownloadPostasPDF Logicgatesaretheprimarybuildingblocksofanydigitalcircuit.Thenamelogicgatesareobtainedfromtheabilityofsuchdevicestoreachdecisionsinthesensethatitgeneratesoutputsfordifferentcombinationsofinputs.ThelogicgatesarebroadlyclassifiedasBasicgates,UniversalgatesandSpecialpurposegates.ThroughthisarticleyouwilllearnaboutNOTgate;oneofthebasicgates.ANOTgateisasingleinput-andsingleoutputgateoftencalledan“inverter”.ANOTgateperformslogicalnegationonitsinputi.eiftheinputistrueorlogic1,thentheoutputwillbefalseorlogiczero.Likewise,afalseorlogiczeroinputresultsinatrueorlogic1output.ThisarticleonNOTlogicgatesbringstoyouanintroductiontoNOTgatethroughthesymbol,truthtable,inputandoutputwaveformforasingleinput,notgaterepresentationusingtransistorsandmore.Also,learnaboutANDGatehere.NOTGateSymbolTheNOTlogicgateisalsoreferredtoasInversionorComplementationgate.ThebelowfigurerepresentsthesymbolofNOTgate.HereAistheinput,YistheOutputandthesmallbubblerepresentstheinversion.TheoutputYisequalto:\(\overline{A}\or\A^{\prime}\)LearnmoreaboutEx-ORGate,here.TheTruthTableofNOTGateThetruthtableofNOTgateisasshownbelowWhentheinputishigh/logic1/truetherespectiveoutputislow/logic0/falseandviceversa.ThewaveformofaNOTgateisasfollows:IfyouarereadingNOTGate,thenyoushouldalsoreadaboutORGate.NOTGateUsingTransistorIftheinputvariableofaNOTgateisassumedtobeA,thentheoutputvariableofthegatewillbeĀ.TheTransistorcircuitforNOTgateisasshownbelow;WhenA=0,ThetransistorisOFFandtheoutputis+Vcc.Similarly,WhenA=1,ThetransistorisONandtheoutputisZero(Ground).KnowmoreabouttheNANDGatehere.NOTGateICandPinDiagramThemostcommonlyusedNOTgateICisthe7404.KeyPointsWhenanevennumberofNOTGatesareconnectedwithfeedback,thenthecircuitactsasabistablemultivibrator.WhenthesameevennumberofNOTgatesareconnectedwithoutfeedback,thenthecircuitactsasabuffer.WhenanoddnumberofNOTgatesareconnectedwithfeedback,thenthecircuitactsasanastablemultivibrator/squarewavegenerator.YoumightalsobeinterestedinreadingmoreaboutEx-NORGate.ForaAstablemultivibrator:\(\begin{array}{l}T=2\Nt_{pd\\}\\\Where,\t_{pd\}is\the\propagation\delay\of\the\inverter.\\T=Time\period\of\square\wave\generator\\N=Number\of\inverters\end{array}\)\(Frequency\of\oscillation=\frac{1}{2Nt_{pd}}\)CheckoutthisarticleonNORGate.Question:ConsideraCircuithaving5NOTgatesconnectedwiththefeedback,wherethepropagationdelayofeachNOTgateis100picosec.CalculatetheTimeperiod?Solution:5NOTgatesconnectedwiththefeedback=Astablemultivibrator\(\begin{array}{l}N=5,\t_{pd}=100\times10^{-12}\\sec\\T=2\times5\times100\times10^{-12}\\sec\end{array}\)WehopethattheabovearticleontheNOTGateishelpfulforyourunderstandingandexampreparations.StaytunedtotheTestbookappformoreupdatesonrelatedtopicsfromDigitalElectronics,andvarioussuchsubjects.Also,reachouttothetestseriesavailabletoexamineyourknowledgeregardingseveralexams.NOTGateFAQsQ.1 WhatdoesaNOTgatedo?Ans.1ANOTgateperformslogicalconverseonitsinput.Inotherwords,onecanunderstandthatiftheinputislogic1,thentheoutputwillbelogiczero.Similarly,afalse/logic0inputresultsinatrue/logic1output.Q.2 Whatisthesymbolofnotgate?Ans.2ThestandardNOTgateisgivenasymbolwhoseappearanceisofatrianglefacingtotherightwithacircleatitsend.Thiscircleisrecognisedasan“inversionbubble”.Q.3 WhatistheapplicationofNOTagateinelectronics?Ans.3TheNOTgateisanelectroniccircuitthatgeneratesaninvertedversionoftheinputatitsoutputQ.4 WhataretheothernamesofNOTgate?Ans.4TheothernamesofNOTgateareinverterandcompliment.Q.5 WhatdoesanevennumberofNOTGatesconnectedwithfeedback,resultin?Ans.5Thecircuitactsasabistablemultivibrator. 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