VCC vs VDD vs VSS: Meaning, Difference, and PCB Net Names
VCC and VDD usually mean the positive power rail. VSS usually means the lower power reference. In many simple CMOS circuits, VSS connects to GND. Do not trust the label by itself. Always check the IC datasheet. Look at the pin table, voltage range, exposed pad notes, and power-up rules before PCB layout. VCC vs […]