GeekInterview.com
Series: Subject: Topic:
Question: 142 of 191

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

Asked by: Interview Candidate | Asked on: Jul 7th, 2007

Editorial / Best Answer

Answered by: sweta basanta

Answered On : 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

Answered On : 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 etcEx of Comb Circuit; Flipflop

Yes  2 Users have rated as useful.
  
Login to rate this answer.
sweta basanta

Answered On : 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.

Yes  6 Users have rated as useful.
  
Login to rate this answer.
sagar61

Answered On : Oct 29th, 2007

View all answers by sagar61

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

Yes  2 Users have rated as useful.
  
Login to rate this answer.
gckgeek

Answered On : Apr 22nd, 2008

View all answers by gckgeek

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.

Yes  1 User has rated as useful.
  
Login to rate this answer.
Nafee

Answered On : May 20th, 2008

View all answers by Nafee

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

Yes  1 User has rated as useful.
  
Login to rate this answer.

A Sequencial Circuit is a digital circuit which has mamory element and a feedback path while a Combinational circuit is a digital circuit which has no memory element and no feedback path.

Yes  1 User has rated as useful.
  
Login to rate this answer.
bharath_p

Answered On : Jul 9th, 2009

View all answers by bharath_p

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.

Yes  2 Users have rated as useful.
  
Login to rate this answer.

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.

  
Login to rate this answer.
satish mb

Answered On : 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.

  
Login to rate this answer.
Mohit Maurya

Answered On : 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).

  
Login to rate this answer.

Give your answer:

If you think the above answer is not correct, Please select a reason and add your answer below.

Related Open Questions

Ads

Connect

twitter fb Linkedin GPlus RSS

Ads

Question Categories

Micro Processor Interview Questions

Interview Question

 Ask Interview Question?

 

Latest Questions

Interview & Career Tips

Get invaluable Interview and Career Tips delivered directly to your inbox. Get your news alert set up today, Once you confirm your Email subscription, you will be able to download Job Inteview Questions Ebook . Please contact me if you there is any issue with the download.