# Is there a standard value for a pull up/down resistor for ic pins?

**URL:** <https://forumautomation.com/t/is-there-a-standard-value-for-a-pull-up-down-resistor-for-ic-pins/9406>\
**Category:** Electronics\
**Created:** [May 17, 2021, 4:38am UTC](https://forumautomation.com/t/is-there-a-standard-value-for-a-pull-up-down-resistor-for-ic-pins/9406 "2021-05-17T04:38:44Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![instrumentationtechi](https://forumautomation.com/letter_avatar_proxy/v4/letter/i/50afbb/32.png) [@instrumentationtechi](https://forumautomation.com/u/instrumentationtechi)\
**Post date:** [May 17, 2021, 4:38am UTC](https://forumautomation.com/t/is-there-a-standard-value-for-a-pull-up-down-resistor-for-ic-pins/9406/1 "2021-05-17T04:38:44Z")

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Does the pull up or pull down resistors for IC pins have a standard value

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**Author:** ![ashlin](https://forumautomation.com/user_avatar/forumautomation.com/ashlin/32/3775_2.png) [@ashlin](https://forumautomation.com/u/ashlin)\
**Post date:** [May 17, 2021, 4:46am UTC](https://forumautomation.com/t/is-there-a-standard-value-for-a-pull-up-down-resistor-for-ic-pins/9406/2 "2021-05-17T04:46:55Z")

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Depends on the I.C. For a TTL Logic Chip of the 74 series, I’d use a 1K0 resistor for pull up OR pull down.

For a CMOS chip, a 100K for a pull-up or a 47K for a pull-down.

Pull down? - If required (TTL) then just ground it. To pull up TTL anything between 1k & 22K - use a lower end value if tying multiple inputs, or if you have a spare NOT ground the input and use the output to tie up.