A 4-bit synchronous counter uses flip-flops with propagation delay of 25 ns each. The time required for change of state to 0000 from 1111 is

A 4-bit synchronous counter uses flip-flops with propagation delay of 25 ns each. The time required for change of state to 0000 from 1111 is
1). 25 n sec
2). 50 n sec
3). 75 n sec
4). 100 n sec
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Answers 1

In synchronous counter all the flip flops change their states simultaneously

The time required to change state is equal to propagation delay of the flip flop

Thus after 25 n sec all the flip flops will change state.
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