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Digital Electronics - Integrated-Circuit Logic Families - Discussion

Discussion Forum : Integrated-Circuit Logic Families - General Questions (Q.No. 11)
Integrated-Circuit Logic Families
11.
What must be done to interface CMOS to TTL?
A dropping resistor must be used on the CMOS 12 V supply to reduce it to 5 V for the TTL.
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.
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.
The two series cannot be interfaced without the use of special interface buffers designed for that purpose, such as the open-collector buffers.
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