SR flip flop - Javatpoint

The SR flip flop stands for "Set-Reset" flip flop. The reset input is used to get back the flip flop to its original state from the current state with an output ... ⇧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 SRFlipFlop TheSRflipflopisa1-bitmemorybistabledevicehavingtwoinputs,i.e.,SETandRESET.TheSETinput'S'setthedeviceorproducetheoutput1,andtheRESETinput'R'resetthedeviceorproducetheoutput0.TheSETandRESETinputsarelabeledasSandR,respectively. TheSRflipflopstandsfor"Set-Reset"flipflop.Theresetinputisusedtogetbacktheflipfloptoitsoriginalstatefromthecurrentstatewithanoutput'Q'.Thisoutputdependsonthesetandresetconditions,whichiseitheratthelogiclevel"0"or"1". TheNANDgateSRflipflopisabasicflipflopwhichprovidesfeedbackfrombothofitsoutputsbacktoitsopposinginput.Thiscircuitisusedtostorethesingledatabitinthememorycircuit.So,theSRflipflophasatotalofthreeinputs,i.e.,'S'and'R',andcurrentoutput'Q'.Thisoutput'Q'isrelatedtothecurrenthistoryorstate.Theterm"flip-flop"relatestotheactualoperationofthedevice,asitcanbe"flipped"toalogicsetstateor"flopped"backtotheopposinglogicresetstate. TheNANDGateSRFlip-Flop Wecanimplementtheset-resetflipflopbyconnectingtwocross-coupled2-inputNANDgatestogether.IntheSRflipflopcircuit,fromeachoutputtooneoftheotherNANDgateinputs,feedbackisconnected.So,thedevicehastwoinputs,i.e.,Set'S'andReset'R'withtwooutputsQandQ'respectively.BelowaretheblockdiagramandcircuitdiagramoftheS-Rflipflop. BlockDiagram: CircuitDiagram: TheSetState Intheabovediagram,whentheinputRissettofalseor0andtheinputSissettotrueor1,theNANDgateYhasaninput0,whichwillproducetheoutputQ'1.ThevalueofQ'isfadedtotheNANDgate'X'asinput'A',andnowboththeinputsoftheNANDgate'X'are1(S=A=1),whichwillproducetheoutput'Q'0. Now,iftheinputRischangedto1with'S'remaining1,theinputsofNANDgate'Y'isR=1andB=0.Here,oneoftheinputsisalso0,sotheoutputofQ'is1.So,theflipflopcircuitissetorlatchedwithQ=0andQ'=1. ResetState TheoutputQ'is0,andoutputQis1inthesecondstablestate.ItisgivenbyR=1andS=0.OneoftheinputsofNANDgate'X'is0,anditsoutputQis1.OutputQisfadedtoNANDgateYasinputB.So,boththeinputstoNANDgateYaresetto1,therefore,Q'=0. Now,iftheinputSischangedto0with'R'remaining1,theoutputQ'willbe0andthereisnochangeinstate.So,theresetstateoftheflipflopcircuithasbeenlatched,andtheset/resetactionsaredefinedinthefollowingtruthtable: Fromtheabovetruthtable,wecanseethatwhenset'S'andreset'R'inputsaresetto1,theoutputsQandQ'willbeeither1or0.TheseoutputsdependontheinputstateSorRbeforetheinputconditionexist.So,whentheinputsare1,thestatesoftheoutputsremainunchanged. Theconditioninwhichboththeinputsstatesaresetto0istreatedasinvalidandmustbeavoided. 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