Why is a pull-up resistor needed when connecting TTL logic to CMOS lo

1.	Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?
A.	to increase the output low voltage
B.	to decrease the output low voltage
C.	to increase the output high voltage
D.	to decrease the output high voltage
Answer» D. to decrease the output high voltage

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Why is a pull-up resistor needed when connecting TTL logic to CMOS logic?

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