"D. C. Sessions" wrote:
> Adrian Shiner wrote:
> > Surely all this data sheet spec rise & fall times info is becoming "foo dust" as switches become faster? The slew rate of a voltage waveform at a given point on a printed circuit, driven from a perfect switch (zero switch time)
> > depends solely on the current source/ sink capability of the generator being switched, its approximation to a current or voltage source and the circuit impedance.
> Not really. The output current doesn't go instantaneously from full-drive
> sink (or off) to full-drive source, so the output waveform isn't *entirely*
> a capacitive-charging curve. In fact (as we've been discussing) real loads
> are close to the real axis, so the I/T curve dominates.
> > Why don't the IC manufacturers defne the output driver broadly in line with the above?
> Actually, that's what too many do and what we've been griping about.
> D. C. Sessions
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