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whats in circuit and electronic book voltage supply show VDD or VCC?

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stackprogramer

stackprogramer

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why in circuit and electronic book voltage supply show with VDD or VCC?

hi,my question is VDD or VCC is abbreviation what words?
wy we write VDD?8-O
 

VDD is the drain supply for devices containing mosfets.
VCC is the collector supply for devices containing bipolar transistors.

They are not really abbreviations for actual words, just conventions for labelling the power supply pins of integrated circuits.
 
You also notice that the selection is quite arbitrary and has no relation to the implemented chip technology.
 
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