Difference between combinational and sequential circuit
Answers
Combinational Circuit –
In this output depends only upon present input.
Speed is fast.
It is designed easy.
There is no feedback between input and output.
This is time independent.
Elementary building blocks: Logic gates
Used for arithmetic as well as boolean operations.
Combinational circuits don’t have capability to store any state.
As combinational circuits don’t have clock, they don’t require triggering.
These circuits do not have any memory element.
It is easy to use and handle.
Examples – Encoder, Decoder, Multiplexer, Demultiplexer
Sequential Circuit –
In this output depends upon present as well as past input.
Speed is slow.
It is designed tough as compared to combinational circuits.
There exists a feedback path between input and output.
This is time dependent.
Elementary building blocks: Flip-flops
Mainly used for storing data.
Sequential circuits have capability to store any state or to retain earlier state.
As sequential circuits are clock dependent they need triggering.
These circuits have memory element.
It is not easy to use and handle.
Examples – Flip-flops, Counters