Difference in between Synchronous and Asynchronous counter

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In digital electronics, respond to is a sequential reasonable circuit consists of a series of flip-flops. The counts the variety of occurrences of intake in terms of an unfavorable or positive edge transitions. Lock are offered in applications such as occasion synchronization and frequency measurement, estimate of angular position and also the duration of an event. Counters are quite similar to registers as both consist of a cascaded setup of an ext than one flip-flop v or there is no combinational reasonable devices. Counters are largely used because that counting applications. The count represents the variety of clock pulses arrived. Based on the way the flip-flops space triggered, counters can be classified into two significant categories: synchronous and asynchronous counter. In a synchronous counter, every the flip-flops are motivated by the exact same clock signal vice versa, in an asynchronous counter, flip-flops are triggered with different clock signals. Unequal an asynchronous counter, the state of the output bits alters simultaneously in a synchronous counter, without any kind of ripple. Let’s take it a look at the differences in between the two.

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What is Synchronous Counter?

In a synchronous counter, likewise known as a parallel counter, all the flip-flops in the counter adjust state at the exact same time in sync v the intake clock signal. When counter is clocked such that each flip-flop in the respond to is prompted by the same clock signal at the exact same time, the respond to is dubbed as synchronous counter. It differs from asynchronous counters in the the counting pulse entry is connected to the clock input of all the flip-flops. Since all the flip-flops are clocked in ~ the very same time, a synchronous respond to with the same number and form of flip-flops have the right to operate in ~ much higher clock frequencies 보다 asynchronous counters. Together the clock signal is simultaneously used to the clock entry of all the flip-flops, there is no time lag between the different outputs.

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What is Asynchronous Counter?

An asynchronous counter is often referred to as a ripple counter. In a ripple counter, the output of one flip-flop cd driver the other. That is a cascaded arrangement of flip-flops wherein output of one flip-flop drives the clock calculation of the following flip-flop. A ripple counter consists of a series of complimenting flip-flops whereby the output of each flip-flop is linked to the clock intake of the following higher-order flip-flop. The clock signal is directly used to the first flip-flop only and it is ultimately transmitted, through a time delay from one flip-flop come another. For instance, the calculation of the an initial flip-flop is the clock entry of the 2nd flip-flop, and the calculation of the second flip-flop is the clock intake of the 3rd flip-flop, and so on. Because of the propagation delay, ripple counters space usually slower than their synchronous counterparts in operation.

Difference in between Synchronous and also Asynchronous Counter

Clock entry

– In a synchronous counter, the same source is offered by the clock input across all the flip-flops, developing the exact same signal in ~ the same time, an interpretation the counter is clocked in together a method that each flip-flop in the respond to is triggered by the exact same clock signal at the exact same time. On the contrary, in one asynchronous respond to (also referred to as ripple counter) just the an initial flip-flop is clocked through an outside clock which consequently drives the clock output of the following flip-flop. In a ripple counter, the calculation of one flip-flop cd driver the other.

Operation

– every the flip-flops space clocked in ~ the exact same time, hence a synchronous respond to with the very same number and form of flip-flops have the right to operate in ~ much higher clock frequencies 보다 its asynchronous counterpart. It differs from asynchronous counters in that the counting pulse intake is linked to the clock input of all the flip-flops. In an asynchronous counter, no common clock is used definition the clock intake of the flip-flops is not pushed by the very same clock signal. On the contrary, in a synchronous counter, every flip-flop is motivated by the usual clock pulse.

Time hold-up

– since the clock signal in a synchronous respond to is used to the clock input of every the flip-flops in ~ the exact same time, over there is no time lag between the different outputs. So, there is no innate propagation delay in synchronous counters. In an asynchronous counter, the clock signal is directly applied to the first flip-flop only and it is consequently transmitted, which outcomes in a succeeding time hold-up from one flip-flop to another, which eventually accounts because that its low speed operation contrasted to synchronous counter.

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Synchronous vs. Asynchronous Counter: comparison Chart

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Summary

In a synchronous counter, every the flip-flops are motivated by the very same clock signal and also the outputs the the counter adjust state at the exact same time, so over there is no innate propagation delay between the different outputs. In an asynchronous counter, in contrast with synchronous counters, the clock input of the flip-flops is not triggered by the very same clock signal; in fact, the output of one flip-flop cd driver another. This results in a succeeding time lag in between the outputs from one flip-flop come another. ~ above the contrary, over there is no innate time lag between the outputs in a synchronous counter.