Question: What must be done to interface TTL to CMOS?
Options
A : A dropping resistor must be used on the CMOS of 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
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