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A 4-bit asynchronous (ripple) counter is built from flip-flops, each having a propagation delay of 10 ns. What is the maximum clock frequen…

1146Medium DSSSB TGT Computer Science 0 replies

A 4-bit asynchronous (ripple) counter is built from flip-flops, each having a propagation delay of 10 ns. What is the maximum clock frequency at which it can work reliably?

A10 MHz
B40 MHz
C25 MHz
D100 MHz

Correct answer: C

Explanation

The clock period must exceed the total ripple delay 4 × 10 = 40 ns, so f_max = 1/40 ns = 25 MHz.

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