Well, take a look at Microchip 24C00, which I assumed was old enough to be
close to the spec. It says 0.7VCC and 0.3VCC. Thats a problem...



At 05:02 PM 8/22/2003 -0400, you wrote:
> > Hmm, you're right Michael, noise immunity WILL suffer, since the I2C
> > parts swing at 0.7VCC for a guaranteed HI and 0.3VCC for a guaranteed
> > low. (24C00 used as a reference).
>
>I think that is contrary to the IIC standard.  I remember the IIC logic
>thresholds were defined as absolute voltages, and lower than most logic
>families running on 5V.  I'm not where I can look this up right now, so
>I'm not totally sure.
>
>
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--------------
Bob Axtell
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