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Forums
Engineering
Electrical Engineering
Choosing pull down resistor
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[QUOTE="Svein, post: 5460339, member: 538805"] It depends on what you use the pull-down resistor for. If you use it to pull down an input after something else has pulled the input high, you need to look at the time constant defined by your resistance and the input capacitance of the gate (which is ≤7.5pF from the spec sheet). A resistor of 10kΩ gives a time constant of 75ns, which is acceptable. A resistor of 1MΩ gives a time constant of 7.5μs, which will keep the gate in the linear region for quite a long time (means higher current draw, increased noise sensitivity and possible instability). If you need a high resistance, consider putting it in front of a schmitt-trigger input. [/QUOTE]
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Forums
Engineering
Electrical Engineering
Choosing pull down resistor
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