An eight stage ripple counter uses a flip-flop with propagation delay of 75 nanoseconds. The pulse width of the strobe is 50ns. The frequency of the input signal which can be used for proper operation of the counter is approximately

An eight stage ripple counter uses a flip-flop with propagation delay

1.	An eight stage ripple counter uses a flip-flop with propagation delay of 75 nanoseconds. The pulse width of the strobe is 50ns. The frequency of the input signal which can be used for proper operation of the counter is approximately
A.	1 MHz
B.	500 MHz
C.	2 MHz
D.	4 MHz
Answer» B. 500 MHz