Pull-down resistor

404

07:23:50

Pull-down (pull-up) resistor is used to provide a low (high) voltage to an input of a logic system when input source is disconnected.

published 11 years ago

faceblast

11 years ago

does a Pulldown resistor need to be a specific resistance for the circuit application, or can I just throw anything on it

Igor

11 years ago

I only know that the value (as well as pull-up vs pull-down choice) depends on logic gate technology. Values for CMOS logic are larger than those for bipolar logic.

kickit2

11 years ago

It depends on the amount of current the source can sink/source. Your resistance value needs to be such that the current through it will create the voltage drop/rise need to set your logic level.

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