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A 4-bit MOD-6...

Question

A 4-bit MOD-6 ripple counter uses J-K flip-flop. If propagation delay of each flip-flop is 20nsec, then the maximum clock frequency used is______ $M H z .$

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Solution

A 4-bit ripple counter uses 4 flip-flops and total delay,
$T_{d} = n t_{p d f} = 4 \times 20 \times 10^{- 9} T_{d} = 80 \times 10^{- 9} s e c$
Maximum clock frequency that can be used is
$f = \frac{1}{T_{d}} = \frac{1}{80 \times 10} = 12.5 M H z$

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