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T Flip-Flop

In a J-K flip-flop, if both J and K are tied to same input, then the derived Flip-flop becomes T Flip-Flop (shown below ).

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This has only one input which is called T-input.

Input Tn Output Qn+1
0 Qn
1 NOT (Qn)

When T is 1 this flip-flop becomes a toggle flip-flop, and the output Q keeps toggling on every clock edge(-ve). T Flip-flops are used in synchronous counter circuits.