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  1. A MOD - 2 counter, the FF has a tpd = 60 nsec. The NOR gate has a tpd of 30 nsec. The clock frequency is

    2. A.
    37 MHz
    B.
    40 MHz
    C.
    111 MHz
    D.
    none

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    Answer : Option A

    Explanation :

    Clock period should be greater than or equal tpd

    MOD-12 → X FF = 4 x 60 = 240 n sec

    tpd of NOR gate = 30 n sec Total = 240 + 30 ⇒ 270 n sec

    .

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