Almost all
integrated circuits (ICs) have at least two pins which connect to the
power rails of the circuit they are installed in. These are known as the IC's power supply pins. However, the labeling of the pins varies by IC family and manufacturer. The simplest labels are V+ and V−. However, internal design and historical tradition have led to a variety of other labels being used. Also, V+ and V− may be confused with the + and − voltage inputs to ICs like
op amps.Sometimes one of the power supply pins will be referred to as
ground. In digital logic, this is nearly always the negative pin; in analog integrated circuits, it is most likely to be a pin intermediate in voltage between the most positive and most negative pins .
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VIRTUAL CHANNEL CONNECTION. VCC