Difference between Combinational Circuit and Sequential Circuit:
The difference between combinational circuit and sequential circuit is given in table below
| Sl no | Combinational Circuit | Sequential Circuit |
| 1 | In combinational circuits, the output variables are at all times dependent on the combination of input variables. | In sequential circuits, the output variables dependent not only on the present input variables but they also depend up on the past history of these input variables. |
| 2 | Memory unit is not required in combinational circuits. | Memory unit is required to store the past history of input variables in the sequential circuit. |
| 3 | Combinational circuits are faster in speed because the delay between input and output is due to propagation delay of gates. | Sequential circuits are slower than the combinational circuits. |
| 4 | Combinational circuits are easy to design. | Sequential circuits are comparatively harder to design. |
| 5 | Parallel adder is a combinational circuit. | Serial adder is a sequential circuit. |