Topic: Digital Circuits
A 4-bit synchronous counter uses flip-flops with propagation delay time of 25 ns each. The maximum possible time required for change of state will be
- A. 25 ns
- B. 50 ns
- C. 75 ns
- D. 100 ns
Answer: A. 25 ns
Explanation: In a synchronous counter, the clock pulse is applied simultaneously to all flip-flops. Therefore, the state of all flip-flops changes concurrently, and the maximum time required for the counter state to change is simply the propagation delay of a single flip-flop, which is 25 ns.