Logic circuits

A T flip-flop whose output toggles on every clock edge produces an output at what multiple of the clock frequency?

  1. A2 times
  2. B1/2
  3. C1/4
Show answer and explanation

Answer: B. 1/2

A T flip-flop (with T = 1) toggles on every rising clock edge, so its output completes one cycle every two clocks, giving half the clock frequency. Chaining them gives dividers of 1/4, 1/8 and so on, forming a binary counter.

  • A. A flip-flop cannot double the frequency.
  • B. Correct. One period takes two clocks, so the frequency is halved.
  • C. Dividing by 4 requires two T flip-flops in series.
Practice this topic Back to topic

More Logic circuits questions

  1. Which circuit outputs, in binary, the number of the highest-priority input when several inputs are 1 at the same time?
  2. What is the drawback of a ripple-carry adder made by chaining full adders?
  3. Which correctly describes the hold time of a flip-flop?
  4. Which correctly describes clock skew in a synchronous circuit?
  5. What is the third state that the output of a tri-state buffer can take?