A binary ripple counter is to be constructed using J-K flip-flops

A binary ripple counter is to be constructed using J-K flip-flops with each flip-flop having a propagation delay of 12 ns. The largest MOD counter that can be constructed using these flip-flops and still operate upto a clock frequency of 10 MHz is—

Given, operating frequency = 10 MHz
t_{pd = 12 ns of each flip-flop
we know that}

or 10 × 10⁶ ≤	1
	n × 12 × 10^-9

or n ≤	100
	12

or n ≤ 8.33
or n = 8
Now, Modulus or MOD,
N = 2ⁿ = ⁸ = 256
Hence alternative (C) is the correct choice.