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Computer organization Notes

Difference between Asynchronous and Synchronous Counter Circuits

Asycnhronous Counters Sycnhronous Counters
1. The delay time of all the flip-flops are added 1. The clock pulse are applied to all the flip flops simultaneously so there is minimum delay.
2. The frequency in asynchronous counter is higher than synchronous counters Frequency of operation is less in synchronous counter
3. The circuit of asynchronous counter is simple 3.The circuit of synchronous counter is complex
4. A number of logic devices are needed for the operation of asynchronous counter 4. Minimum number of logic devices are required.
5. These counters are more costlier than synchronous counter 5.these counters are relatively less costlier
6. In an asynchronous counter, an external event is used to directly SET or CLEAR a flip-flop when it occurs. 6. In a synchronous counter however, the external event is used to produce a pulse that is synchronized with the internal clock.
7. Are also known as Ripple counter
8. Have an overall count which Ripples through, meaning the overall operation is relatively slow 8. It requires no settling time due to rippling as all flip flops are clocked synchronously.
9. Require virtually no design 9. It needs a lot of designing, to determine how the present state of the circuit must be used to determine the next state (i.e. Count)

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