> some other way). Several possible energy dissipating terminations are a
> resistor to Vdd,

NOT to Vdd. Feeding back power into a low current bus is guaranteed to
increase its voltage, which you do not want. The resistor must go to GND
but it can be in series with a zener to increase speed. A capacitor will
decrease spikes but will also slow down the switching so a compromise must
be made.

Peter

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