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what is the maximum counting speed of 4-bit binary counter which is composed of flip-flops with a propagation delay of 25ns?
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4 Bit binary counter(asynchronous counter)  means There are 4 flip flops and each flip flop delay is 25ns

so total delay 4*25ns = 100ns

counting speed = frequency of the output = 1/100=10Mhz

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