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jedi hawk's Library tagged Symbols   View Popular

13 Apr 08

Vcc, Vdd, Vss, etc.

good description of Vcc/Vee, Vdd/Vss and why they may be labeled that way.

encyclobeamia.solarbotics.net/...vxx.html - Preview

Vcc Vee Vdd Vss electronics electricity schematics symbols power v+ v- General Technology references

  • Apparently this terminology originated in some way from the terminals of each type of transistor, and their common connections in logic circuits (i.e., Vcc is often applied to BJT collectors, Vee to BJT emitters, Vdd to FET drains, and Vss to FET sources). This notation then carries across to integrated circuits -- TTL ICs were originally based on BJT technology, and so often use the Vcc / Vee terminology; CMOS ICs are based on FET technology, and so often use the Vdd / Vss terminology.
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