The term flip-flop has historically referred generically to both level-triggered and edge-triggered circuits that store a single bit of data using gates.

It can also be used for counting of pulses, and for synchronizing variably-timed input signals to some reference timing signal.ДЇlip-flops can be either level-triggered (asynchronous, transparent or opaque) or edge-triggered ( synchronous, or clocked). When used in a finite-state machine, the output and next state depend not only on its current input, but also on its current state (and hence, previous inputs). Such data storage can be used for storage of state, and such a circuit is described as sequential logic in electronics. A flip-flop is a device which stores a single bit (binary digit) of data one of its two states represents a 'one' and the other represents a 'zero'. Flip-flops and latches are fundamental building blocks of digital electronics systems used in computers, communications, and many other types of systems.ДЇlip-flops and latches are used as data storage elements. It is the basic storage element in sequential logic. The circuit can be made to change state by signals applied to one or more control inputs and will have one or two outputs. In electronics, a flip-flop or latch is a circuit that has two stable states and can be used to store state information вЂ“ a bistable multivibrator. An animated interactive SR latch ( R1, R2 = 1 kО© R3, R4 = 10 kО©).

Falling edge triggered flip flop