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In digital circuits, a flip-flop is a term referring to an electronic circuit
(a bistable multivibrator) that has two stable states and thereby is capable
of serving as one bit of memory. Today, the term flip-flop has come to mostly
denote non-transparent (clocked or edge-triggered) devices, while the simpler
transparent ones are often referred to as latches; however, as this
distinction is quite new, the two words are sometimes used interchangeably.
A flip-flop is usually controlled by one or two control signals and/or a gate
or clock signal. The output often includes the complement as well as the normal
output. As flip-flops are implemented electronically, they require power and
ground connections.