Combinational Circuit Vs Sequential Circuit

Combinational Circuit	Sequential Circuit
The output doesn’t depends upon previous states.	The output depends upon present inputs as well as previous inputs.
Memory elements are not present in combinational circuits.	Memory elements are present to store the past history of input variables in sequential circuits.
More hardware is required.	Less hardware is required.
These are faster in speed.	These are slower in speed.
These are easy to design as memory elements are absent.	These are difficult to design due to memory elements.
These are expensive.	These are cheap.
Clock circuit is not used in these circuits.	Clock circuit is an essential requirement in these circuits.
Feedback path is not used.	Feedback path is used.
Examples: parallel adders, multiplexers, encoders, code converters etc.	Examples: flip-flops, counters, registers etc.
Block Diagram:	Block Diagram: