Flip-flops
Sequential logic devices storing single bits with state persisting between clock cycles. Flip-flops enable memory, counters, and sequential circuits. SR flip-flops, JK flip-flops, D flip-flops, and T flip-flops provide different input/output relationships.
Real World
Every register inside an ARM processor in your smartphone is built from D flip-flops — each one stores a single bit of data that updates on every clock tick, billions of times per second.
Exam Focus
State the type of flip-flop, then describe its behaviour on a clock edge — examiners expect edge-triggered language, not just 'when input changes'.
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