Multiple choice

Consider a 4-bit ripple counter and a 4-bit synchronous counter made using flip-flops. Propagation delay = 10 nano-seconds. R = worst case delay in the ripple counter, S = worst case delay in the synchronous counter. Which of the following options is correct?

  1. R = 10 ns, S = 40 ns

  2. R = 40 ns, S = 10 ns

  3. R = 10 ns, S = 30 ns

  4. R = 30 ns, S = 10 ns
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Propagation delay in 4-bit ripple counter = 4 Td = 40 ns. Propagation delay in synchronous counter = Td = 10 ns.

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