| 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:
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Block Diagram:
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