> The minimum and maximum figures on the data sheet are the
> values that Microchip guarantees will be recongnized as a 1 or 0.
> Your measurements are within the range, so it is doing what it
> is supposed to be doing.

> The amount of hysteresis Vhys is listed as 0.1V typical on the
> current data sheet (no limits given).

Yes, you're absolutely right, and I'm pleased that you've been
able to show that in the documentation. I was sure I'd read the
latest pdf correctly as TBD and got distracted by the 1V - 4V
thing, but on re-reading it does say 0.1Vhys. And I'm not likely
to forget now ;-)

> > there's the ability to sneak past the 1.60V IRQ point without the
> > PIC noticing

Now that I know I'm measuring a good PIC correctly, then this
dv/dt limitation is also a fact of life, even though I expected an
ST to detect slowly decreasing voltages and generate an IRQ
(slowly increasing ones ARE detected reliably) ?

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