Timeline for Where Does VDD+0.3V Input Limit Come From on IC chips?
Current License: CC BY-SA 4.0
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| Sep 21, 2019 at 14:15 | comment | added | vicatcu | oh interesting maybe this is really the answer... | |
| Sep 20, 2019 at 19:58 | comment | added | supercat | I've also encountered a part (I think it was 74HCxx) which behaved as though each pair of inputs had a PNP transistor between them, with the base tied to VDD. One input happened to be weakly pulled down while the other was pulled above VDD by about 100uA. A small enough current that chip damage would have been a non-issue, but much of that 100uA flowed out onto the adjacent input. | |
| Sep 20, 2019 at 0:38 | history | answered | penguin359 | CC BY-SA 4.0 |