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  1. In a 4 bit ripple counter using flip flops with tpd = 40 ns, the maximum frequency can be

    2. A.
    1.25 MHz
    B.
    3.25 MHz
    C.
    6.25 MHz
    D.
    12.5 MHz

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    Answer : Option C

    Explanation :

    Total time delay = 40 x 4 = 160 x 100-9s. Hence .

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