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.
|NOR SR (Set Reset) Flip Flop Logic Diagram|
|0||0||1||0||( After S=1 R=0 )|
|0||0||0||1||( After S=0 R=1 )|
|NAND SR (Set Reset) Flip Flop Logic Diagram|
|1||1||0||1||( After S=1 R=0 )|
|1||1||1||0||( After S=0 R=1 )|