Logic circuits
Which correctly describes the operation of a D flip-flop?
- AIt always passes input changes directly to the output
- BIt outputs the exclusive OR of two inputs
- CIt captures the value of the D input at a clock edge and holds it until the next edge
Show answer and explanation
Answer: C. It captures the value of the D input at a clock edge and holds it until the next edge
A D flip-flop captures the value of its D input at the rising (or falling) edge of the clock and keeps outputting that value until the next edge. It is the basic storage element of sequential circuits such as registers and counters.