Compare synchronous and asynchronous counter.
Asynchronous Counter
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Synchronous Counter
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In an Asynchronous Counter the output of one Flip Flop acts as the clock Input of the next Flip Flop.
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In a Synchronous Counter all the Flip Flop’s are Connected to a common clock signal.
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Speed is Low
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Speed is High
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Only J K or T Flip Flop can be used to construct Asynchronous Counter
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Synchronous Counter can be designed using JK,RS,T and D FlipFlop.
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Problem of Glitch arises
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Problem of Lockout
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Only serial count either up or down is possible.
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Random and serial counting is possible.
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Settling time is more
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Settling time is less
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Also called as serial counter
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Also called as Parallel Counter
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