Asked by: Delio Conradt
technology and computing web development

What is synchronous and asynchronous counter?

Last Updated: 31st March, 2020

In an asynchronous counter, an external event isused to directly SET or CLEAR a flip-flop when it occurs. In asynchronous counter however, the external event is used toproduce a pulse that is synchronised with the internal clock. Anexample of an asynchronous counter is a ripplecounter.

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In this way, what is the difference between synchronous and asynchronous counter?

Synchronous counters have an internal clock,whereas asynchronous counters do not. As a result, all theflip-flops in a synchronous counter are drivensimultaneously by a single, common clock pulse.

One may also ask, what is the difference between a synchronous and an asynchronous load input? Their is a big difference between a synchronousand asynchronous load inputs. The Synchronous load issynchronous and this means that the count from the Q outputswill stay the same when it goes through the load input. TheAsynchronous load input is different.

Keeping this in view, what is asynchronous counter?

A ripple counter is an asynchronouscounter where only the first flip-flop is clocked by anexternal clock. All subsequent flip-flops are clocked by the outputof the preceding flip-flop. Asynchronous counters are alsocalled ripple-counters because of the way the clockpulse ripples it way through the flip-flops.

What are synchronous counters used for?

Applications of Synchronous Counters As the name suggest, Synchronous countersperform “counting” such as time and electronic pulses(external source like infrared light). They are widely usedin lots of other designs as well such as processors, calculators,real time clock etc.

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