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Why D flip flop is referred to as sequential circuit?

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D flip flop

I usually think of DFF as a sequential element or cell which is used to make a sequential circuit. Sequential circuits, as opposed to combinatorial or combinational circuits, are those with clocked storage elements like DFF (or TFF, or JKFF) or latches, or other memories.

Combinatorial circuit outputs depend on only the current inputs.

Sequential circuit outputs depend on current inputs and the previous state of the storage elements in them.
 

Re: D flip flop

Why D flip flop is referred as sequential circuit?

a sequential circuit is one that has a memory element involved with it.

now take any flop, data is latched by the flop on the active edge of the clock, so data is held in the flop till the next active edge of the clock. so the flop acts as an memory element where data is held for a certain period of time based on your clock period.

This is same for d flop.
 

D flip flop

Not only D flip flop. If there exits any storage element in a circuit and the output is based on previous state .It constitute a sequential circuit.
 

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