# Electronics help (with polarity of TTL IC's)

**URL:** <https://forum.kirupa.com/t/electronics-help-with-polarity-of-ttl-ics/232558>\
**Category:** random\
**Created:** [July 15, 2007, 11:00pm UTC](https://forum.kirupa.com/t/electronics-help-with-polarity-of-ttl-ics/232558 "2007-07-15T23:00:51Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![zellers](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.kirupa.com/zellers/32/3135_2.png) [@zellers](https://forum.kirupa.com/u/zellers)\
**Post date:** [July 15, 2007, 11:00pm UTC](https://forum.kirupa.com/t/electronics-help-with-polarity-of-ttl-ics/232558/1 "2007-07-15T23:00:51Z")

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Alright, just wondering, with a transistor-transistor logic gate IC, such as a 7404 Hex Not gate, do the input or output terminals have polarity, i.e. can the input be either positive or negative, and the IC still work? see below.

[![](http://img516.imageshack.us/img516/1114/kirupaicvp4.th.png)](http://img516.imageshack.us/my.php?image=kirupaicvp4.png)

Would that circuit work, in terms of polarity for both IC’s I know the 2nd IC isn’t connected to a load, but in terms of polarity, can the polarity of an IC for the input / output be swapped.

Here is my ACTUAL design that I want to use, I should be able to answer all questions in terms of the functionality that I want to achieve if you wish to know what I want it to do.

[![](http://img161.imageshack.us/img161/2317/toggleandterminateie7.th.png)](http://img161.imageshack.us/my.php?image=toggleandterminateie7.png)