What is a sequential circuit and What is a combinational circuit?Is there any difference between them? If yes what is it?

Editorial / Best Answer

Answered by: sweta basanta

  • Sep 11th, 2007


Combinational circuit are those whose output depends only upon the present inputs but in sequential circuit the output depends upon both present and past inputs. that is the difference. 

Showing Answers 1 - 10 of 10 Answers

kajamuhaiyadeen

  • Sep 2nd, 2007
 

Combinational circuit does not have any memory in the feedback path but the sequential circuit has memory in the feedback path.
Ex of SEQ Circuit: Encoder, Decoder etc
Ex of Comb Circuit; Flipflop

sweta basanta

  • Sep 11th, 2007
 

Combinational circuit are those whose output depends only upon the present inputs but in sequential circuit the output depends upon both present and past inputs. that is the difference. 

sagar61

  • Oct 29th, 2007
 

sequential ckt. is a logic ckt whose output at any instant depend upon the past output or input value.
combinational ckt is a ckt whose o/p at anyinstant depend upon only present input.
The sequential ckt involves memory, combinational ckt has no memory

gckgeek

  • Apr 22nd, 2008
 

The main differance between sequential and combinational circuit is memory. The output of the sequential circuit depend upon the privious input and previous output of the circuit. While in case of combinational, current output is depend on current input only.

Nafee

  • May 20th, 2008
 

Sequential circuits are those crt whoese output depond on present input as well as on previos o/p,it has flip flops for temporary storage e.g flip flop & on the other hand the combinational logic crt ae those whoese output only depond on present input only e.g mux,de-mux,encoder,decoder

bharath_p

  • Jul 9th, 2009
 

Combinational Logic: Output are obtained as soon as inputs are provided. Output is independant of previous OUTPUT states.


Sequential Logic: Output is obtain on the clock or similar control signal. It is also dependant upon previous OUTPUT states.

A sequential circuit uses flip flops. Unlike combinational logic, sequential circuits have state, which means basically, sequential circuits have memory.

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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satish mb

  • Sep 25th, 2013
 

Combinational circuits are those whose output depends on only present inputs, sequential circuits are those whose output depends on both present inputs and previous outputs. in combinational circuits the output is synchronous to the input, that is when input is applied then output will come, in sequential circuits input data is synchronous to the clock.

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Mohit Maurya

  • Sep 28th, 2013
 

Combinatorial circuits are those whose output depends on only present inputs but in Sequential circuits , there is concept of Memory Element .So in Sequential circuits output depends on both present inputs and previous outputs(stored in memory).

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