Sequential Circuits
What is the difference between Combinational & Sequential Circuits?
The combinational circuit does not use any memory. Hence the previous state of input does not have any effect on the present state of the circuit. But sequential circuit has memory so output can vary based on input. This type of circuits uses previous input, output, clock and a memory element.
Moore Machine : output logic does not depends on input directly.
Mealy Machine : output logic depends on input directly.
Mealy Machine : output logic depends on input directly.
Flip Flop
Flip flop is a sequential circuit which generally samples its inputs and changes its outputs only at particular instants of time and not continuously. Flip flop is said to be edge sensitive or edge triggered rather than being level triggered like latches.
There are 4 types -
There are 4 types -
- S-R Flip Flop
- J-K Flip Flop
- D Flip Flop
- T Flip Flop