Why Power Supply is Called VDD and Differences with VDD, …
https://www.rlctalk.com/why-power-supply-is-called-vdd/
WEBIn most circumstances, the voltage represented by VCC is positive. Indicating: The supply voltage for unipolar devices, such as MOS transistors, is represented by the term VDD, whereas the power supply voltage for bipolar devices, including such bipolar junction transistors, is represented by the term VCC (BJTs).
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