Difference between synchronous and asynchronous counter. Design mode-7 synchronous counter using T-flip flop. Show necessary truth tables and k-maps.


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The difference between synchronous and asynchronous counter.

SN Synchronous Counter Asynchronous Counter
1. In synchronous counter, all flip flops are triggered with same clock simultaneously. In asynchronous counter, different flip flops are triggered with different clock, not simultaneously.
2. Synchronous Counter is faster than asynchronous counter in operation. Asynchronous Counter is slower than synchronous counter in operation.
3. Synchronous Counter does not produce any decoding errors. Asynchronous Counter produces decoding error.
4. Synchronous Counter is also called Parallel Counter. Asynchronous Counter is also called Serial Counter.
5. Synchronous Counter designing as well implementation are complex due to increasing the number of states. Asynchronous Counter designing as well as implementation is very easy.
6. Synchronous Counter will operate in any desired count sequence. Asynchronous Counter will operate only in fixed count sequence (UP/DOWN).
7. Synchronous Counter examples are: Ring counter, Johnson counter. Asynchronous Counter examples are: Ripple UP counter, Ripple DOWN counter.
8. In synchronous counter, propagation delay is less. In asynchronous counter, there is high propagation delay.


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