Compare Combinational circuits with Sequential circuits.

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SR.NO	COBINATIONAL CIRCUIT	SEQUENTIAL CIRCUIT
1.	Output at any instance of time depends only on the present input.	Output at any instance depends on present as well as past states of the system.
2.	Memory unit is not required	Memory is required to store past state
3.	They are faster in operation	They are slower in operation
4.	Feedback is not required, as output of circuit is according to the input logic design	It has feedback from output to input that is stored in the memory for the next operation.
5.	Easy to design	Difficult to design
6.	Logic gates are the elementary building blocks	Flip flops are the elementary building unit
7.	Independent of clock and hence does not require triggering to operate	Dependent on Clock as Triggering is required for operation
8.	Example:- Half and full adder/subtractor,MUX and DEMUX	Example:- Flip flops, Shift Registers

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