Combinational and Sequential Circuits:

Combinational circuits are defined as time-independent circuits that do not depend on previous inputs to generate any output and are called combinational circuits.

Sequential circuits are those that depend on clock cycles and depend on present and past inputs to generate any output.

Combinational circuit –

1. In this case, the output depends only on the current input.

2. The speed is fast.

3. It is designed in a simple way.

4. There is no feedback between input and output.

5. This is independent of time.

6. Elementary building blocks: logic gates

7. It is used for both arithmetic and Boolean operations.

8. Combinational circuits do not have the capacity to store any state.

9. Since combinational circuits do not have a clock, they do not require activation.

10. These circuits do not have any memory element.

11. It is easy to use and handle.

Examples: encoder, decoder, multiplexer, demultiplexer

Blocks diagram –

Sequential circuit –

1. In this case, production depends on both present and past input.

2. The speed is slow.

3. It has a robust design compared to combinational circuits.

4. There is a feedback path between input and output.

5. This depends on time.

6. Elementary building blocks: flip flops

7. It is mainly used to store data.

8. Sequential circuits have the capacity to store any state or retain a previous state.

9. Since sequential circuits depend on the clock, they need to be activated.

10. These circuits have a memory element.

11. It is not easy to use or handle.

Examples: flip flops, counters