Counters - Technical MCQs

Q1:

A 4-bit ripple counter consists of flip-flops, which each have a propagation delay from clock to Q output of 15 ns. For the counter to recycle from 1111 to 0000, it takes a total of ________.

A 15 ns

B 30 ns

C 45 ns

D 60 ns

ANS:D - 60 ns

Kindly note that, the given counter is ripple(asynchronous), So only it would take 4*15 = 60ns.

If it is synchronous counter, it would take 15ns, to come out the results.