Why is a pull-up resistor needed for an open collector gate?

1.	Why is a pull-up resistor needed for an open collector gate?
A.	to provide vcc for the ic
B.	to provide ground for the ic
C.	to provide the high voltage
D.	to provide the low voltage
Answer» D. to provide the low voltage

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Why is a pull-up resistor needed for an open collector gate?

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