# Difference Between Synchronous And Asynchronous Counters Pdf

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This operating mode makes it possible to limit the duration of the periods of instability and consequently allows higher operating speeds than in asynchronous mode. Its design and implementation are very simple. Synchronous simply means that all events are occurring in a certain time order that can be predicted. Asynchronous counters are relatively slow in operation than synchronous counter due to the fact that the clock signal to the flip flop constituting the counter is not provided simultaneously. Disadvantages Of Synchronous Counter.

## Asynchronous binary 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.

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. Note that each bit in this four-bit sequence toggles when the bit before it the bit having a lesser significance, or place-weight , toggles in a particular direction: from 1 to 0. The Q outputs of each flip-flop will serve as the respective binary bits of the final, four-bit count:. The first flip-flop the one with the Q 0 output , has a positive-edge triggered clock input, so it toggles with each rising edge of the clock signal. In the very first flip-flop circuit shown in this chapter, I used the clock signal itself as one of the output bits.

## synchronous and asynchronous counters

The Web This site. The output is a binary value whose value is equal to the number of pulses received at the CK input. Each output represents one bit of the output word, which, in 74 series counter ICs is usually 4 bits long, and the size of the output word depends on the number of flip-flops that make up the counter. The output lines of a 4-bit counter represent the values 2 0 , 2 1 , 2 2 and 2 3 , or 1,2,4 and 8 respectively. They are normally shown in schematic diagrams in reverse order, with the least significant bit at the left, this is to enable the schematic diagram to show the circuit following the convention that signals flow from left to right, therefore in this case the CK input is at the left.

Counters remember the digital combinations of data. Counters are used everywhere and every time in our day to day life. Example is the digital clock alarm that wakes you up in the early morning. There are two types of counters. Asynchronous counters are those whose output is free from the clock signal. Because the flip flops in asynchronous counters are supplied with different clock signals, there may be delay in producing output.

## Module 5.6

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.

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 relation to a clock. The most common type is a sequential digital logic circuit with an input line referred to as 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. A counter circuit is usually constructed of a number of flip-flops connected in cascade.

#### Difference Between Synchronous And Asynchronous Counter In Tabular Form

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