On the contrary, in a synchronous counter, every flip-flop is triggered by the common clock pulse. So, there is no inherent propagation delay in synchronous counters. In an asynchronous counter, the clock signal is directly applied to the first flip-flop only and it is subsequently transmitted, which results in a subsequent time delay from one flip-flop to another, which eventually accounts for its low speed operation compared to synchronous counter. In a synchronous counter, all the flip-flops are triggered by the same clock signal and the outputs of the counter change state at the same time, so there is no inherent 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 same clock signal; in fact, the output of one flip-flop drives another.
This results in a subsequent time lag between the outputs from one flip-flop to another. On the contrary, there is no inherent time lag between the outputs in a synchronous counter. Difference Between Synchronous and Asynchronous Counter. Difference Between Similar Terms and Objects. MLA 8 Khillar, Sagar. Name required. Email required. Please note: comment moderation is enabled and may delay your comment.
There is no need to resubmit your comment. Notify me of followup comments via e-mail. Written by : Sagar Khillar. Foundations of Digital Logic Design. Singapore: World Scientific, Print [3]Ndjountche, Tertulien. Print [4]Kal, Santiram. Print Articles on DifferenceBetween.
It allows the transmission of data in the form of frames or blocks. Thus, a huge data amount can be transmitted between transmitter and receiver once the clock pulse is sent.
This time interval is decided by the frequency of the external clock pulse. So basically in synchronous transmission, the clock pulse decides when to transmit the data and for this, both transmitter and receiver must be ready to have communication. Asynchronous transmission is a type of serial transmission that follows a non-synchronized form of communication. Thus start and stop bits are required in order to intimate the receiver about the beginning and end of the data stream. Here the data is transferred from an end to another in the form of bytes or characters.
Thus when the transmitter wants to send data then it has to notify the receiver that it is going to send the data bits. So for this reason before sending the actual data the transmitter sends a start bit that notifies the receiver about the transmission.
And after sending the data byte, the transmitter sends stop bit that shows the completion of the data. The transmitter and receiver in the asynchronous transmission system have their internal clock for operation. But do not operate on a common clock pulse. Thereby leading to unawareness about the proper transmission. Therefore, due to this reason start and stop bits are utilized in the asynchronous communication system. However, the presence of start and stop bit reduces the data transmission rate in the case of asynchronous transmission.
Skip to content. Difference between Synchronous and Asynchronous sequential circuits. Table of Contents. Block Diagram of Sequential circut. Synchronous sequential circuit.
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