Asynchronous counter
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Synchronous counter
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1. In case of asynchronous counter,
all the flip-flops are not clocked simultaneously.
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In case of synchronous counter, all
the flip-flops are clocked simultaneously.
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2. In the case of asynchronous
counter, the output of first flip-flop drives the clock for second flip-flop,
the output of second drives the third and so on.
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In case of synchronous counter , there
is no interconnection between output of one flip-flop and clock of next
flip-flop,
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3. The settling time of asynchronous
counter is cumulative sum of individual flip-flops.
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The settling time of synchronous
counter is equal to highest settling time of all flip-flops. theses are basic difference between asynchronous and synchronous counter.
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4. Asynchronous counter is known as
serial counter
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Synchronous counter is known as
parallel counter.
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5.Its design and implementation is very
simple.
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Synchronous counter design and
implementation becomes tedious and complex as the number of states increases.
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6. Asynchronous counter is slow in
speed as compare of synchronous counter.
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Synchronous counter is faster in speed
as compare to asynchronous counter.
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