Marechiare wrote:
> He propopsed an idea that an impedance calculated as (R1*R)/(R1+R2)
> would reflect the "speed" of the signal - the lower impedance - the
> higher speed.

Yes.

> I objected it with the example to remove the bottom
> resistor, - the impedance will be higher, and the speed will be
> higher. That's it, nothing more, no rules changed.

Yes they have.  The output will now go to 5V instead of 3.3V, which is a
violation of the rule that the output must drive a 3.3V input within its
spec.

You clearly still haven't looked up Thevenin Equivalent.  Go do that.


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