Difference between Synchronous and Asynchronous Counter

Synchronous Counter	Asynchronous Counter
1. This circuit are easy to design.	1. This circuit are difficult to design.
2. A clocked flip flop act as memory element.	2. An unclocked flip flop or time delay element is used as memory element.
3. Flip Flop is used in it.	3. Latches are used in asynchronous circuits.
4. They are slower.	4. Faster as clock is not present.
5. The status of memory element is effected only at the active edge of clock, if input is changed.	5. The status of memory element will change any time as soon as input is changed.

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