# Difference between combinational and sequential circuit

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In digital electronics both combinational and sequential circuit are the most widely used circuits. These are two broad categories of circuits defined in the digital electronics where one type of circuit is independent of time and other is dependent on time.

Following are the important differences between combinational and sequential circuit

Sr. No.KeyCombinational CircuitSequential Circuit
1DefinitionCombinational 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.
2FeedbackIn 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.
3PerformanceAs 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.
4ComplexityNo 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.
5Elementary BlocksElementary building blocks for combinational circuit are logic gates.On other hand building blocks for sequential circuit are flip flops..
6OperationCombinational circuit are mainly used for arithmetic as well as Boolean operations.On other hand Sequential circuit is mainly used for storing data.
Updated on 09-Jun-2020 08:47:12