A 4 bit module - 16 ripple counter uses JK F/F. If the propagation delay of each F/F is 50 nano seconds, the maximum clock frequency that can be used is equal to
- A. 20 MHz
- B. 5 MHz
- C. 10 MHz
- D. 4 MHz
Answer: B. 5 MHz
Explanation: Ripple counter needs T ≥ 4×50 ns = 200 ns, so fmax = 5 MHz.