pull up and pull down resistor

Posted on Feb 5, 2014

Most of the beginners in digital electronics assume that the hanging input is a logic 0. Then, that`s a misconception. They are neutral state which can be a logic 0 or a logic 1. This will bring chaos on your circuit operation. As you can see, in each case there is a default input. For a pull-up, the default input to the logic IC is 1. And for the

pull up and pull down resistor
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pull-down, the logic is 0. The resistor also provide a current limiting function thus affecting power consumption of the input section. 10kohms is the commonly value but any value can be use depending on your application.

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