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A Synchronous Sequential Circuit is a system whose behavior can be defined on the timing of their signals , where in the case of asynchronous sequential circuit depend upon the order in which its inputs signals change and can be affected at any instance of time .

(reference : M. Moris Mano)

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Why the synchronous modems are more costly than the asynchronous modems?

Because they contain clock recovery circuits


Differecne between synchronous circuit and a asynchronous circuit?

Synchronous circuits operate under the influence of s clock pulse while asynchronous circuits operate without the influence of a clock pulse


What is clocked-mode sequential circuit?

A sequential circuit is a type of logic circuit. It sends an output that is dependent upon the present input in addition to the history of the input. That makes it different from a combinational circuit, whose output depends solely on the present input. Given their reliance on input history (or stored input), sequential circuits are particularly useful in computer random access memory (RAM). The two types of sequential circuits are synchronous circuits and asynchronous circuits.


What is the advantage of syncronous circuits over asynchronous circuits?

faster operation


Difference between synchronous and asynchronous flip flops?

Synchronous flip-flops change outputs synchronously to a clock signal, while asynchronous flip-flops can change outputs regardless of the clock signal. Asynchronous flip-flops are not as commonly used due to potential timing hazards, while synchronous flip-flops are widely used in digital circuits to ensure reliable operation.


What has the author L L Kinney written?

L. L. Kinney has written: 'Decomposition of asynchronous sequential switching circuits'


What is the advantage and disadvantage of a synchronous counter over an asynchronous counter?

1. Easier to design 2. No propagation delay Actually the second one is the most important reason. In designing circuits that work at high clock rates, ripples will result in errors so synchronization is very very important.


How synchronous work?

With timing, sent from end to end. Examples are synchronous data with explicit timing circuits at interfaces and plesiochronous where the timing is embedded in the main signal by line codes. Asynchronous, without timing is historical and relates to teleprinter speeds up to 300 bit/s.


What are the disadvantages of asynchronous counter?

Counter circuits made from cascaded J-K flip-flops where each clock input receives its pulses from the output of the previous flip-flop invariably exhibit a ripple effect, where false output counts are generated between some steps of the count sequence. These types of counter circuits are called asynchronous counters, or ripple counters.


What has the author Janusz A Brzozowski written?

Janusz A. Brzozowski has written: 'Digital networks' -- subject(s): Digital electronics 'Asynchronous circuits' -- subject(s): Asynchronous circuits


What is the advantage of asynchronous circuits over synchronous circuits?

mainly power consumption decreases in asynchronous chips they works based on time(i.e., when its term comes) but programming is of asynchronous chips are more difficult task because of we have to switch ON the chips one by one for that we have to determine the exact time that a single chip takes to complete its given instruction after completion we have to switch on the another chip. while in the sych..chips single clock circulates entire system and all the chips should be in working state


What are differences between asynchronous counter and synchronous counter?

Synchronous CountersSynchronous counters typically consist of a memory element, which is implemented using flip-flops, and a combinational element, which is traditionally implemented using logic gates. Logic gates are logic circuits with one or more input terminals and one output terminal, in which the output is switched between two voltage levels determined by a combination of input signals. The use of logic gates for combinational logic typically reduces the cost of components for counter circuits to an absolute minimum, so it remains a popular approach.Clock PulseSynchronous counters have an internal clock, whereas asynchronous counters do not. As a result, all the flip-flops in a synchronous counter are driven simultaneously by a single, common clock pulse. In an asynchronous counter, the first flip-flop is driven by a pulse from an external clock and each successive flip-flop is driven by the output of the preceding flip-flop in the sequence. This is the essential difference between synchronous and asynchronous counters.Asynchronous CountersAsynchronous counters, also known as ripple counters, are the simpler type, requiring fewer components and less circuitry than synchronous counters. Asynchronous counters are easier to construct than their synchronous counterparts, but the absence of an internal clock also introduces several major disadvantages. The flip-flops in an asynchronous counter change states at different times, so the delays in changing from one state to another -- known as propagation delays -- add up to create an overall delay. The more flip-flops an asynchronous counter contains, the greater the overall delay.ConsiderationsTypically, asynchronous counters are less useful than synchronous counters in complex, high-frequency systems. Some integrated circuits react faster than others, so if an external event occurs close to a transition between states -- when some, but not all, the integrated circuits have changed state -- it may introduce errors into the counter. Such errors are difficult to predict because of the randomly variable time difference between events. Furthermore, propagation delays can make it difficult to detect, or decode, the output state of an asynchronous counter circuit electronically.