Compare Asynchronous and synchronous counter

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Asynchronous counter	Synchronous counter
The flip flop output transition serves as a source for triggering other flip flops	The input pulses are applied to all clock pulse inputs of all flipflops directly.
Propagation time delay of this type of counter is Tpd=N x (Delay of 1 FF)

where N is the number of flipflops. | Propagation time detail of this type of counter is Tpd = (Delay of 1 FF) + delay of 1 gate. | | Operating frequency is low | Operating frequency is high | | Ouput can be changes at any instant of time by changing the input. | Output changes at discrete interval of time. |

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