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A rectangle with a single T input and a clock.
Also known as: Toggle flip-flop, T-type flip-flop, Divide-by-two stage
A T flip-flop toggles its output on every clock edge when T is high, which means it divides the clock frequency by two. Chain n of them together and you have a binary counter — which is what most counters actually are inside.
Denotes a toggle flip-flop: its output inverts on each active clock edge while the T input is asserted.
Contexts: Electrical equipment
Divides the input clock frequency by two, which is why a chain of them forms a ripple counter.
Contexts: Electrical equipment
An upright rectangle with the letter T and a small triangle marked on its left side and Q on its right.