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1 Jan 2016

Difference Between Sequential And Combinational Circuits

Difference Between Sequential And Combinational Circuits

Combinational circuit is a circuit whose output is dependent only on the inputs at the same instant of time where as a sequential circuit is a circuit whose output does not only depend on the present inputs but also on the past history of inputs.

A sequential circuit simply consists of combinational circuit and memory elements are connected to it to form a feedback path as shown in the block diagram below:

Sequential circuit block diagramFurther differences between combinational and sequential circuits can be listed as follows:

S.No.

Combinational Circuit

Sequential Circuit

1.It contains no memory elementsIt contains memory elements
2.The present value of it’s outputs are determined solely by the present values of it’s inputsThe present value of it’s outputs are determined by the present value of it’s inputs and it’s past state
3.It’s behavior is described by the set of output functionsIt’s behavior is described by the set of next-state(memory) functions and the set of output functions

A sequential circuit can further be categorized into Synchronous and Asynchronous. You might also want to see the difference between synchronous and asynchronous flip flops.

 


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