D Flip-Flop

Also known as data or delay flip-flop. Input is captured at rising edges of clock. Has 2 inputs: DD and ClkClk and 1 output: QQ. Built using 2 D latches.

D D En En QN Q Q D Clk

To build a D flip-flop that’s triggered by falling edge of clock, the first NOT gate should be removed.

Characteristics

Characteristic Tabl

DClkComment
0↑Reset
1↑Set
X0No change
X1No change

Excitation Table

Current State (Q)Next State (Q+)D
000
011
100
111
Written by October 17, 2026 1 min read
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