JK flip flop - Javatpoint

The JK flip flop is one of the most used flip flops in digital circuits. The JK flip flop is a universal flip flop having two inputs 'J' and 'K'. ⇧SCROLLTOTOP Home Biometrics DigitalElectronics ComputerFundamentals ComputerNetwork ControlSystem Java HTML CSS Selenium JavaScript jQuery Projects InterviewQ DigitalElectronics DigitalElectronics BinarySystem NumberSystem NumberBaseConversion GrayCode Excess-3Code ErrorDetection&CorrectionCode ASCIICode Signed&UnsignedBinaryNumbers 1'sComplement 2'sComplement 9's&10'sComplement Radix&DiminishedRadixcomplement Add&Subtractusing1'sComplement Add&Subtractusing2'sComplement BooleanAlgebra BooleanAlgebra BooleanFunctions BooleanLaws&Rules LogicGates ANDGate ORGate NOTGate NANDGate NORGate XORGate XNORGate CanonicalForm Minterm&Maxterm Sumofproduct ProductofSum ConversionbetweenCanonicalForms BooleanFunction K-mapMethod SimplificationusingK-map De-Morgan'sTheorem Don'tCareCondition Codeconversion BinarytoBCDandBCDtoBinaryConversion BinarytoGrayandGraytoBinaryConversion BinarytoExcess-3andExcess-3toBinaryConversion BCDtoExcess-3andExcess-3toBCDConversion CombinationalLogic CombinationalLogicCircuit HalfAdder FullAdder HalfSubtractor FullSubtractor BinaryAdder BinaryAdder-Subtractor DecimalorBCDAdder MagnitudeComparator Decoder Encoder Multiplexer De-multiplexer SequentialLogic Sequentialcircuits Basicsofflipflop SRflipflop JKflipflop Dflipflop Tflipflop Masterslaveflipflop Register,counters,andmemoryunit Introduction Shiftregister Counters Ripplecounter Ringcounter Johnsoncounter Latches Introduction MCQ DigitalElectronicsMCQ next→ ←prev JKFlipFlop TheSRFlipFloporSet-Resetflipflophaslotsofadvantages.But,ithasthefollowingswitchingproblems: WhenSet'S'andReset'R'inputsaresetto0,thisconditionisalwaysavoided. WhentheSetorResetinputchangestheirstatewhiletheenableinputis1,theincorrectlatchingactionoccurs. TheJKFlipFlopremovesthesetwodrawbacksofSRFlipFlop. TheJKflipflopisoneofthemostusedflipflopsindigitalcircuits.TheJKflipflopisauniversalflipflophavingtwoinputs'J'and'K'.InSRflipflop,the'S'and'R'aretheshortenedabbreviatedlettersforSetandReset,butJandKarenot.TheJandKarethemselvesautonomousletterswhicharechosentodistinguishtheflipflopdesignfromothertypes. TheJKflipflopworkinthesamewayastheSRflipflopwork.TheJKflipflophas'J'and'K'flipflopinsteadof'S'and'R'.TheonlydifferencebetweenJKflipflopandSRflipflopisthatwhenbothinputsofSRflipflopissetto1,thecircuitproducestheinvalidstatesasoutputs,butincaseofJKflipflop,therearenoinvalidstatesevenifboth'J'and'K'flipflopsaresetto1. TheJKFlipFlopisagatedSRflip-flophavingtheadditionofaclockinputcircuitry.Theinvalidorillegaloutputconditionoccurswhenbothoftheinputsaresetto1andarepreventedbytheadditionofaclockinputcircuit.So,theJKflip-flophasfourpossibleinputcombinations,i.e.,1,0,"nochange"and"toggle".ThesymbolofJKflipflopisthesameasSRBistableLatchexceptfortheadditionofaclockinput. BlockDiagram: CircuitDiagram: InSRflipflop,boththeinputs'S'and'R'arereplacedbytwoinputsJandK.ItmeanstheJandKinputequatestoSandR,respectively. Thetwo2-inputANDgatesarereplacedbytwo3-inputNANDgates.ThethirdinputofeachgateisconnectedtotheoutputsatQandQ'.Thecross-couplingoftheSRflip-floppermitsthepreviousinvalidconditionof(S="1",R="1")tobeusedtoproducethe"toggleaction"asthetwoinputsarenowinterlocked. Ifthecircuitis"set",theJinputisinterruptedfromthe"0"positionofQ'throughthelowerNANDgate.Ifthecircuitis"RESET",Kinputisinterruptedfrom0positionsofQthroughtheupperNANDgate.SinceQandQ'arealwaysdifferent,wecanusethemtocontroltheinput.Whenbothinputs'J'and'K'aresetto1,theJKtogglestheflipflopasperthegiventruthtable. TruthTable: WhenbothoftheinputsofJKflipfloparesetto1andclockinputisalsopulse"High"thenfromtheSETstatetoaRESETstate,thecircuitwillbetoggled.TheJKflipflopworkasaT-typetoggleflipflopwhenbothofitsinputsaresetto1. TheJKflipflopisanimprovedclockedSRflipflop.Butitstillsuffersfromthe"race"problem.ThisproblemoccurswhenthestateoftheoutputQischangedbeforetheclockinput'stimingpulsehastimetogo"Off".Wehavetokeepshorttimingplusperiod(T)foravoidingthisperiod. 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