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 nsThis question was addressed to me at a job interview.This intriguing question comes from Asynchronous Counter topic in division Counters of Digital Circuits

A 4-bit ripple counter consists of flip-flops, which each have a propa

1.	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 nsThis question was addressed to me at a job interview.This intriguing question comes from Asynchronous Counter topic in division Counters of Digital Circuits
Answer» The correct OPTION is (d) 60 ns To explain I would say: Since a COUNTER is constructed USING flip-flops, therefore, the propagation delay in the counter occurs only due to the flip-flops. ONE BIT change is 15 ns, so 4-bit change = 15 * 4 = 60.

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