Gregory's Serverall right, i'm going to run another 24h aging experiment with 5V on the unpowered pin. let's see how it does. i'll do the measurements at 150MHz. my suspicion is that hot carrier injection could increase the propagation delay of the input, but we shall see.
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 i could dig into this some more, but for now, it looks like the RP2350 is 5V tolerant. i didn't see any evidence of HCI or metal migration. these aren't exhaustive tests since i didn't do them over the full supply voltage and temperature range, so i wouldn't use it for 5V tolerance in a commercial project, but this should be fine for hobby projects.  @tubetime Sorry if you already said it and I lost the info, but did you test only on FT pins or also no non FT pins?  @tubetime now do the RP2040, that one is a bit more of an open question 😅 |
seems to be the same. that's good.