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Compare synchronous with asynchronous counter
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The logic circuit of synchronous counters becomes difficult as number of states increase in the counter whereas the logic circuit of asynchrounous is simple to design and we feed output of one flipflop to clock of next flipflop.

The operating frequency is higher for synchronous and low for asynchronous counters.

Propagation time delay of this type of counter is:

$T_{pd}=N\ast\text{(Delay of 1 FF)[Asynchronous]}$

Propagation time delay of synchronous counter is:

$T_{pd}=\text{(Delay of 1 FF)}+\text{delay of 1 gate}$

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