A 4 bit modulo 16 ripple counter uses JK flip-flops. If the propagation delay of each FF is 50 ns. The max. clock frequency that can be used is equal to
A.20 MHz
B.10 MHz
C.5 MHz
D.4 MHz
Answer: C
Propagation Delay for one FF is 50 nsec. For 4 FF = 50 x 4 = 200 nsec.