Discussion
A flip-flop is best described as a circuit that
Answer: C
Correct answer: stores one bit of information
A flip-flop is a bistable circuit: it has two stable states and remains in whichever it was last put into, so it stores exactly one bit. It is the basic element of all sequential logic and of static memory. The distinction from combinational logic is the essential one. A combinational circuit’s output depends only on its present inputs; a sequential circuit’s output depends on its inputs and on its stored state, which is what gives it memory. The common types are the SR flip-flop, which sets and resets but has a forbidden input combination; the D flip-flop, which simply captures the value on its data input at the clock edge; the JK, which resolves the SR ambiguity by toggling; and the T, which toggles on each clock pulse. Chained together, flip-flops make registers, shift registers and counters. A latch is the level-triggered relative of the edge-triggered flip-flop.
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