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clipka wrote:
> According to JEDEC,
>
> VCC = logic power voltage, serving as a reference for high signal levels
> (often sharing a common rail with VDD, in which case they may be used
> interchangeably).
>
> VDD = drain power voltage. separate (positive) power rail to drive the
> chip's internals.
>
> VSS = GND = ground reference / source power voltage, serving as both
> (negative) power rail and low signal level reference.
>
> VSSQ = GNDQ = output stage source power voltage / ground reference,
> serving as both a (negative) power rail and low signal level reference
> specifically for output signals (should always be at the same level as
> VSS=GND).
Suddenly the picture becomes even more complex than you feared...
> (This is just a subset of all the symbols used; for instance,
> digital/analog devices such as programmable amplifiers or ADCs/DACs
> often use separate voltage rails for the analog signals.)
Thank god I don't have to deal with anything analogue yet! ;-)
--
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