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

Computer Science Engineering (CSE)
Digital Electronics and Logic Design
What must be done to interface TTL to CM...

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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