Question

A binary ripple counter uses flip‐flops that trigger on the positive‐edge of the clock. What
will be the count if
(a) the normal outputs of the flip‐flops are connected to the clock and
(b) the complement outputs of the flip‐flops are connected to the clock?

Answer 1

The count will be  where n= number of bits .

Explanation:

The binary ripple counter is an asynchronous counter. In asynchronous counter the first flip flop is controlled by the external clock where as all other remaining flip flops are controlled by the output of the preceding flip flops.

Now the MOD of the ripple counter is always  where n=number of flip flops used. The range of the count for n-bit counter will be  .

For example if the value of n=4 the total count of the states will be  i.e it will have the count from 0000 to 1111.

Therefore, we can say that total 15 FFs will be required whatever flip flop we use either JK, T, D OR SR, we still need 15 flip flops to read its maximum count.

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