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IES 2018_Digital Logic_ripple counter

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In a 4-stage ripple counter, the propagation delay of a flip flop is 30 ns. If the pulse width of the strobe is 30 ns, the maximum frequency at which the counter operates reliably is nearly_________ 

(a) 9.7 MHz

(b) 8.4 MHz

(c) 6.7 MHz

(d) 4.4 MHz

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