Digital Circuits fall under two basic categories they are, Combinational and Sequential. The Combinational circuits are those which has no storage elements and the output of the combinational circuits depends only on the present input. The Sequential circuits on the other hand, has storage elements and their output depends on external inputs and the values in the storage elements. The sequential circuits can be further classified into Synchronous and Non synchronous.
A synchronous sequential circuit is a system whose behavior can be defined from the knowledge of its signals at discrete instants of time(clock pulses). The behavior of an asynchronous sequential circuit depends upon the input signals at any instant of time and the order in which the inputs change.
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