T flip-flop

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T flip-flop A clocked flip-flop whose output “toggles”, i.e. changes to the complementary logic state, on every active transition of the clock signal (see clock). The device acts as a divide-by-two counter since two active transitions of the clock signal generate one active transition of the output. It can be considered as being equivalent to a JK flip-flop whose J and K inputs are held at logic 1.