vcc vdd vee vff Distinguish the three different symbols of VCC, VDD and VSS. In electronic circuits, we often see three different symbols of VCC, VDD and VSS. What is the difference between them? 1. Explanation VCC: C=circuit means circuit, that is, the voltage connected to the circuit; VDD: D=device means device, that is, the working voltage inside the device; VSS: S=series means common connection, usually refers to the voltage of the common ground terminal of the circuit. 2. Explanation 1. For digital circuits, VCC is the power supply voltage of the circuit, VDD is the working voltage of the chip (usually Vcc>Vdd), and VSS is the ground point. 2. Some ICs have both VDD pins and VCC pins, which means that this device has its own voltage conversion function. 3. In field effect tubes (or COMS devices), VDD is the drain and VSS is the source. VDD and VSS refer to component pins, not power supply voltages. VDD: power supply voltage (unipolar device); power supply voltage (4000 series digital circuit); drain voltage (field effect transistor) VCC: power supply voltage (bipolar device); power supply voltage (74 series digital circuit); voice controlled carrier (Voice Controlled Carrier) VSS: ground or negative power supply VEE: negative voltage supply; source (S) of field effect transistor VPP: programming/erase voltage. Detailed explanation: In electronic circuits, VCC is the power supply voltage of the circuit, and VDD is the working voltage of the chip: VCC: C=circuit means circuit, that is, the voltage connected to the circuit, D=device means device, that is, the working voltage inside the device. In ordinary electronic circuits, Vcc>Vdd is generally used! VSS: S=series means common connection, that is, negative pole. Some ICs have both VCC and VDD. This device has voltage conversion function. Vcc and Vee appear in bipolar transistor circuits and are related to the collector and emitter, so one is positive and the other is negative. Vdd and Vss appear in MOS circuits and are related to the drain and source, which are also positive and negative. Vcc and Vdd are the power supply terminals of the device. Vcc is the power supply terminal of the bipolar device.
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