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Compare : Combinational Logic circuit and Sequential Logic circuit

written 6.8 years ago by ypsukale • 50

modified 2.8 years ago by Krishna_Agrawal • 2.7k

Subject: Industrial Electronics

Topic: Microprocessor and Microcontrollers

Difficulty: Medium

industrial electronics

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written 2.8 years ago by Krishna_Agrawal • 2.7k

•   modified 2.8 years ago

Combinational Circuit v/s Sequential Circuit

Sr. No.	Parameters	Combinational Circuit	Sequential Circuit
1.	Definition	Combinational Circuit is the type of circuit in which output is independent of time and only relies on the input present at that particular instant.	On other hand Sequential circuit is the type of circuit where output not only relies on the current input but also depends on the previous output.
2.	Feedback	In Combinational circuit as output does not depend on the time instant, no feedback is required for its next output generation.	On other hand in case of Sequential circuit output relies on its previous feedback so output of previous input is being transferred as feedback used with input for next output generation.
3.	Performances	As the input of current instant is only required in case of Combinational circuit, it is faster and better in performance as compared to that of Sequential circuit.	On other hand Sequential circuit are comparatively slower and has low performance as compared to that of Combinational circuit.
4.	Complexity	No implementation of feedback makes the combinational circuit less complex as compared to sequential circuit.	However on other hand implementation of feedback makes sequential circuit more complex as compared to combinational circuit.
5.	Time dependency	It is not time-dependent.	It uses clock pulse i.e. it is time-dependent.
6.	Output Obtained	Combination of operands not necessary in same sequence.	Sequence of operands is necessary in sequential circuit.
7.	Memory Element	Memory element is not present in combinational logic circuit.	Memory element is present in sequential logic circuit.
8.	Elementary Blocks	Elementary building blocks for combinational circuit are logic gates.	On other hand building blocks for sequential circuit are flip flops..
9.	Operation	Combinational circuit are mainly used for arithmetic as well as Boolean operations.	On other hand Sequential circuit is mainly used for storing data.
10.	Example	Multiplexer, De-multiplexer, Encoder, Decoder, Half-adder, Full-adder, etc. that are used for arithmetic operation and boolean operation.	Flip-flops, Registers, Counters, etc. that are used to store data.

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