Sequential Circuits:

A digital system is needed to store binary numbers in addition to performing logic; Flip- Flops implements the function of storing the binary information. Let us learn how do these Flip-flops operate and carry out as a memory unit/cell. Sequential circuits are those circuits whose output at any time instant t based on input values of previous time instants and the current input or in other words it has a memory. All of the combinatorial logic circuits, which have been discussed till now, do not have memory and they are not sequential circuits. Besides Flip-flops we shall also discuss the sequential circuits such like counters and shift registers and their possible use in the digital systems.