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digital electronics · sequential logic

Rising-Edge D Flip-Flop

A D flip-flop stores one binary value. At its active clock edge, it copies the level at D to Q and retains that value until the next active edge. Q-bar is the inverse of Q, which is useful when later logic needs both polarities. This example uses a 74HC74-style symbol with a 5 V supply, a data input and a clock input. It is a concise starting point for explaining registers, counters and other synchronous digital circuits. Add reset or preset pins when the stored value must have a defined startup state.

Type Schéma électriqueNorme IEEE Std 315 / ANSI Y32.2Moteur schematex-circuitMis à jour 24/09/2026
Rising-Edge D Flip-Flop
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La demande

“Draw a 5 V 74HC74 rising-edge D flip-flop with D and clock inputs, plus Q and Q-bar outputs, each with a 10 kΩ load to ground.”

Essayez ensuiteAdd an active-low clear input.Change the supply to 3.3 V.
Ce que contient ce dessin

Comprenez les décisions qui le sous-tendent.

01Edge trigger

The clock input identifies when D is captured.

02Complementary outputs

Q and Q-bar show both stored states.

03Logic supply

A 5 V rail identifies the device family.

Use this when a design needs one clocked data bit.

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FAQ

Questions fréquentes

What does a D flip-flop do?

It captures the D input on a clock edge and holds that value at Q until the next clock edge.

What is Q-bar?

Q-bar is the complemented output, so it is the opposite logic state to Q.

Why use a clocked flip-flop?

Clocking makes state changes occur at defined times in a synchronous design.