A 8-bit modulo 250 ripple counter uses JK flip-flops. If the propagation delay of each flip flop is 500 ns, the maximum clock frequency that can be used is equal to ______kHz.
250
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Solution
The correct option is A 250 Tc=ntpd fc=1Tc=1ntpd n=8 tpd=500ns ∴fc=18×500×10−9=250 kHz