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Question

An n stage ripple counter can count upto ___________.

A
2n
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B
2n-1
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C
n
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D
2n+1
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Solution

The correct option is B 2n-1

An n stage ripple counter can count upto 2n-1.

All subsequent flip-flops are clocked by the output of the preceding flip-flop. Asynchronous counters are also called ripple-counters because of the way the clock pulse ripples it way through the flip-flops. The MOD of the ripple counter or asynchronous counter is 2n if n flip-flops are used.

The clock input or the information ripples through the consecutive flip flops in asynchronous counters that is the clock input to a flip flop is the output of the preceeding flip flop. Hence they are also termed as ripple counters.

A n-bit ripple counter can count up to 2n states. It is also known as MOD n counter. It is known as ripple counter because of the way the clock pulse ripples its way through the flip-flops.

A ripple counter is an asynchronous counter where only the first flip-flop is clocked by an external clock. All subsequent flip-flops are clocked by the output of the preceding flip-flop. Asynchronous counters are also called ripple-counters because of the way the clock pulse ripples it way through the flip-flops.


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