Digital Electronics - Digital Design - Discussion

Discussion :: Digital Design - General Questions (Q.No.12)


The purpose of a pull-up resistor is to keep a terminal at a ________ level when it would normally be at a ________ level.

[A]. LOW, float
[B]. HIGH, float
[C]. clock, float
[D]. pulsed, float

Answer: Option B


No answer description available for this question.

Asogwa Chukwuemeka said: (Nov 15, 2012)  
In digital IC, a high is 5v while low is 0v. If we have 3. 4v at the output of an IC, it is said to be a float for it is neither High nor Low. To keep such an output voltage to a High condition, we need a pull-up resistor (a resistor connected from +5v to the output of the IC).

If we want to keep the floating output to a constant Low condition, then we connect a pull-down resistor (a resistor connected from 0v to the output of the IC).

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