[Solved] What must be done to interface TTL to CMOS?

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Q.	What must be done to interface TTL to CMOS?
A.	a dropping resistor must be used on the cmos 12 v supply to reduce it to 5 v for the ttl.
B.	as long as the cmos supply voltage is 5 v, they can be interfaced; however, the fan-out of the ttl is limited to five cmos gates.
C.	a 5 v zener diode must be placed across the inputs of the ttl gates in order to protect them from the higher output voltages of the cmos gates.
D.	a pull-up resistor must be used between the ttl output- cmos input node and vcc; the value of rp will depend on the number of cmos gates connected to the node.
Answer» D. a pull-up resistor must be used between the ttl output- cmos input node and vcc; the value of rp will depend on the number of cmos gates connected to the node.

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