VSS,VDD,VCC

[gord...@my-dejanews.com]

for many years i have seen these symbols used
in cct diagrams and have never found out what
they mean.(i know they are supply & ground symbols)
i was once told Vss="voltage super source"
but am at a loss for the others,any ideas?????

-----== Posted via Deja News, The Leader in Internet Discussion ==-----
http://www.dejanews.com/ Now offering spam-free web-based newsreading

[Rudolf]

I do not know what the abbreviation stands for, but
VDD and VCC -- power supply
VSS -- ground.

Rudolf

gord...@my-dejanews.com wrote in article
<6n0l61$etr$1...@nnrp1.dejanews.com>...

[Ralph Wade Phillips]

Hi there!

Rudolf wrote in message <01bda1d0$92435e40$c2b53ecb@rudolf>...

>I do not know what the abbreviation stands for, but
>VDD and VCC -- power supply
>VSS -- ground.

Voltage Drain-Drain, Voltage Collector-Collector, Voltage
Source-Source (as in Source/Drain/Collector for the FETs used to build the
CMOS for today's ICs.)

Leastwise, that's what I remember ...

RwP

[Tony Duell]

Rudolf (rud...@alphalink.com.au) wrote:
: I do not know what the abbreviation stands for, but

: VDD and VCC -- power supply
: VSS -- ground.

It's fairly straightforward, actually.

V means voltage (but you guessed that, right ;-))

Now, for a bipolar transistor, Vc = collector voltage, Ve=emitter
voltage, Vb=base voltage.

For an Fet, Vd=drain voltage, Vs=source voltage, Vg=gate votlage.

Now, for the _supply_ voltages for those electrodes (as opposed to the
voltages actually present on them), you double up the suffix letter.

So Vcc = Collector supply voltage (=+ve supply in most bipolar circuits)
Vee = emitter supply voltage (when this isn't the same as ground, like on
ECL chips)
Vdd = Drain supply voltage
Vss = Source supply voltage

Etc...

-tony