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MCP23017: same part number, two fewer inputs

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NiHaoMike:
https://hackaday.com/2023/02/03/mcp23017-went-through-shortage-hell-lost-two-inputs/
Looks like Microchip messed up a batch (or even an update to a newer process) and decided to change the datasheet rather than fix the problem. Hope it doesn't end up in some product where those missing inputs are important...

djsb:
Maybe it's shrinkflation?

ataradov:
More likely scenario is that some marginal behaviour was discovered and those pins can't fully meet the specification and instead of providing a full new set of characteristics, they were descoped.

It is likely that if it worked so far in your design, it will continue to work. The change is to prevent new designs from into running into potential issues.

In MCU world this happens occasionally and accompanied by a note in the errata document, but I'm not sure if there is even errata for basic ICs like this.

It would be interesting to see if those pins actually work just as they used to and the change is only to the datasheet.

gamalot:
I'm guessing there is nothing has changed on the chip itself, it's just that those two pins were found to work incorrectly when used for input.

newbrain:

--- Quote from: ataradov, abridged by me on February 05, 2023, 06:55:54 pm ---More likely scenario is that some marginal behaviour was discovered and those pins can't fully meet the specification and instead of providing a full new set of characteristics, they were descoped.
[...]
It would be interesting to see if those pins actually work just as they used to and the change is only to the datasheet.

--- End quote ---
I think you are 100% correct; from the change notification page:

--- Quote ---NOTE: Please be advised that this is a change to the document only the product has not been changed.
--- End quote ---

EtA: Oh $DEITY - why did I start reading the comments on HaD, it's the YouTube of tech sites.

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