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  1. For a MOD-12 counter, the FF has a tpd = 60 ns The NAND gate has a tpd of 25 n sec. The clock frequency is

    2. A.
    3.774 MHz
    B.
    > 3.774 MHz
    C.
    < 3.774 MHz
    D.
    4.167 MHz

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    Answer : Option A

    Explanation :

    For a proper working, the clock period should be equal to or greater than

    tpd = Mod 12 - 4FFs = 4 x 60 = 240 nsec.

    Total tpd = 240 + 25 = 265 nsec.

    = fc and fc = 3.774 MHz.

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