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# What is difference between combinational circuit and sequential circuit?

Member since:
31 March 2010
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1,047 (Level 3)

## Best Answer - Chosen by Voters

A combinational circuit neither contains a periodic clock signal nor has any provisions for storage. There are no feedbacks involved and the output at all time is dependent on the inputs provided. The name combinational is derived from the combinations of logic gates used for such circuits.

A sequential circuit involves feedback and has memory (so it is employed for designing RAM). It also has a periodic clock signal and hence the output is also a function of time in addition to being a function of inputs and previous outputs. The name sequential is derived as the output is produced in sequences as the clock circuit enables and disables the functioning. (A latch is also a sequential circuit but has no clock signal and hence is a special case. It is also the basic building block of any sequential circuit.)

to say Simple..

Combinational Circuit does not depend on the previous and next state inputs but this seqential circuit are dependent on those factors..

sequential circuit uses Flipflops.. but combi dont..!

Clock pulse transition plays a dominant role in sequential cicuit

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• by ?
Member since:
12 May 2010
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766 (Level 2)
Hi........ The main difference between sequential circuits and combinational circuits is that sequential circuits compute their output based on input and state, and that the state is updated based on a clock. Combinational logic circuits implement Boolean functions, so they are functions only of their inputs, and are not based on clocks.

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