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Tags: JK Flip-Flop
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SR Flip-Flop:-

The SR flip-flop, also known as a SR Latch, can be considered as one of the most basic sequential logic circuit possible. This simple flip-flop is basically a one-bit memory bistable device that has two inputs, one which will “SET” the device (meaning the output = “1”), and is labelled S and one which will “RESET” the device (meaning the output = “0”), labelled R.

The Basic SR Flip-flop:-

               sr flip flop

Truth Table for this Set-Reset Function:-

StateSRQQDescriptionSet1001Set Q » 11101no changeReset0110Reset Q » 01110no changeInvalid0011Invalid Condition

Diagram formed using simulator:-


JK Flip-Flop:-

The JK flip flop is basically a gated SR flip-flop with the addition of a clock input circuitry that prevents the illegal or invalid output condition that can occur when both inputs S and R are equal to logic level “1”. Due to this additional clocked input, a JK flip-flop has four possible input combinations, “logic 1”, “logic 0”, “no change” and “toggle”. 

The Basic JK Flip-flop:-

          jk flip flop symbol

The Truth Table for the JK Function:-

same as
for the
SR LatchClockInputOutputDescriptionClkJKQQX0010Memory
no changeX0001‾↓ ̲0110Reset Q » 0X0101‾↓ ̲1001Set Q » 1X1010toggle
action‾↓ ̲1101Toggle‾↓ ̲1110

Diagram formed using simulator:-


T Flip-Flop:-

T flip – flop is also known as “Toggle Flip – flop”. To avoid the occurrence of intermediate state in SR flip – flop, we should provide only one input to the flip – flop called Trigger input or Toggle input (T). Then the flip – flop acts as a Toggle switch. Toggling means ‘Changing the next state output to complement of the present state output’.

The Basic T Flip-flop:-

Circuit diagram of T flip - flop using SR latch

Truth Table of T flip – flop:-


Diagram formed using simulator:-


D Flip-Flop:-

D Flip-flops are used as a part of memory storage elements and data processors as well. D flip-flop can be built using NAND gate or with NOR gate. Due to its versatility they are available as IC packages. The major applications of D flip-flop are to introduce delay in timing circuit, as a buffer, sampling data at specific intervals. D flip-flop is simpler in terms of wiring connection compared to JK flip-flop.

Representation of D Flip-Flop using Logic Gates:

       D flip-flop circuit representation with NAND gates

Truth table of D Flip-Flop:


Diagram formed using simulator:-
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JK FlipFlop using AND and NOR Gates

J-K flip-flop is nothing more than an S-R flip-flop with an added layer of feedback. This feedback selectively enables one of the two set/reset inputs so that they cannot both carry an active signal to the multivibrator circuit, thus eliminating the invalid condition.
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JK Flip-Flop using Sequential Logic
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A Synchronous Up Counter MOD-14 with Negative Edge Triggered used JK Flip Flop.
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JK Flip-Flop
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