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Integrated-Circuit Logic Families

Q1: What must be done to interface CMOS to TTL?

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 CMOS is limited to two TTL 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 The two series cannot be interfaced without the use of special interface buffers designed for that purpose, such as the open-collector buffers.

ANS:B - As long as the CMOS supply voltage is 5 V, they can be interfaced; however, the fan-out of the CMOS is limited to two TTL gates.

No answer description is available.



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