As we know that In digital electronics,counter is a sequential logic circuit consisting of a series of flip-flops which is used to counts the number of occurrences of input in terms of negative or positive edge transitions. Now Based on the way the flip-flops are triggered we can distinguish between Synchronous and Asynchronous Counter.
Following are the important differences between Synchronous and Asynchronous Counter.
|Sr. No.||Key||Synchronous Counter||Asynchronous Counter|
|1||Trigger||In case of Synchronous Counter, as the name suggests all the constituent flip flops are triggered with same clock simultaneously.||On other hand in case of Asynchronous Counter there is triggering of different flip flops with different clock.|
|2||Speed||As mentioned above in case of Synchronous Counter all flip flops are triggered altogether hence operation speed of counter become faster as compared to that of Asynchronous counter.||On other hand in case of Asynchronous Counter operation speed is comparatively slower than Synchronous counter.|
|3||Error Prone||Synchronous Counter is less error prone and hence hardly produces any decoding error in the system.||While on other hand Asynchronous Counter is more error prone and produces decoding error in the system.|
|4||Complexity||As all flip flops are being coordinating with the clock hence the design and implementation is complex as compared to that of Asynchronous Counter.||On other hand as output of one flip flop performing as input of next flip flop the design and implementation is quite simple in case of Asynchronous counter.|
|5||Sequence||Synchronous Counter could be operated in any desired count sequence as it could get manipulated by changing the clock sequence.||On other hand Asynchronous counter could operate only in fixed count sequence i.e., UP and DOWN.|
|6||Delay||There is no propagation delay observed in case of Synchronous Counter.||However on other hand there is a subsequent propagation delay from one flip flop to another in case of Asynchronous Counter.|