For a MOD-12 counter, FF hasa tpd = 60 ns. NAND gate has

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For a MOD-12 counter, FF hasa t_pd = 60 ns. NAND gate has a t_pd of 25 ns. The clock frequency is

1. = 3.774 MHz
2. > 3.774 MHz
3. < 3.774 MHz
4. = 4.167 MHz

Correct Option: A

For proper functioning, clock period should be equal to or greater than all the t_pd
MOD – 12 – 4 FFs = 4 × 60 = 240 ns.
t_pd = 25 ns.
∴ Total t_pd = 265 ns
ƒ_c = 3.774 MHz