Difference Between Synchronous Counter And Asynchronous Counter Pdf

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Counters are of two types depending upon clock pulse applied. These counters are: Asynchronous counter, and Synchronous counter. In Asynchronous Counter is also known as Ripple Counter , different flip flops are triggered with different clock, not simultaneously. While in Synchronous Counter , all flip flops are triggered with same clock simultaneously and Synchronous Counter is faster than asynchronous counter in operation.

synchronous and asynchronous counters

The major classification of counters is synchronous and asynchronous counters. The significant difference between synchronous and asynchronous counter is made by the way the clock signal is provided to these digital devices. Synchronous counter is the one in which all the flip flops are clocked simultaneously with the similar clock input. On the contrary, an asynchronous counter is a device in which all the flip flops that constitute that counter are clocked with different input signals at different instants of time. A counter is known as a sequential logic circuit that consists of flip-flops as its fundamental element.

Counter (digital)

The asynchronous counter is a sequential circuit used to count the clock pulses. All flip-flops are clocked simultaneously. Asynchronous is simple, economical and used for transmitting a small amount of data. Asynchronous counters, also known as ripple counters, are the simpler type, requiring fewer components and less circuitry than synchronous counters. 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.

In digital electronics, counter is a sequential logic circuit consisting of a series of flip-flops. It counts the number of occurrences of input in terms of negative or positive edge transitions. They are used in applications such as event synchronization and frequency measurement, estimation of angular position and the duration of an event. Counters are quite similar to registers as both comprise a cascaded arrangement of more than one flip-flop with or without combinational logic devices. Counters are mainly used for counting applications.

For up-counters… On other hand in case of Asynchronous Counter there is triggering of different flip flops with different clock. Asynchronous Counter Synchronous Counter 1. Its operation is faster; Chances of errors are minimal due to the fact that count sequence is controlled using logic gates. These are counters down-counters whose all stages flip-flops are controlled by the same clock signal. Asynchronous Counters. An asynchronous counter is usually called a ripple counter. In asynchronous counter, there is high propagation delay.


As mentioned above in case of Synchronous Counter all flip flops are triggered altogether hence operation speed of counter become faster as.


Difference between Synchronous and Asynchronous Counter

In digital logic and computing , a counter is a device which stores and sometimes displays the number of times a particular event or process has occurred, often in relationship to a clock. The most common type is a sequential digital logic circuit with an input line called the clock and multiple output lines. The values on the output lines represent a number in the binary or BCD number system. Each pulse applied to the clock input increments or decrements the number in the counter.

In the previous section, we saw a circuit using one J-K flip-flop that counted backward in a two-bit binary sequence, from 11 to 10 to 01 to Since it would be desirable to have a circuit that could count forward and not just backward, it would be worthwhile to examine a forward count sequence again and look for more patterns that might indicate how to build such a circuit. The main problem facing us is to determine how to connect these flip-flops together so that they toggle at the right times to produce the proper binary sequence.

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Skip to content. All Homes Search Contact. For up-counters… In Asynchronous Counter is also known as Ripple Counter, different flip flops are triggered with different clock, not simultaneously. Circuit and Operation of Asynchronous Counter. The output of the counter can be used to count the number of pulses. Clock is provided to first flip-flop and the output of first flip-flop acts as clock second flip-flop and so on.

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synchronous and asynchronous counters

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3 Response
  1. Franziska M.

    A counter is a device which can count any particular event on the basis of how many times the particular event s is occurred.

  2. Roxana O.

    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.

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