The difference between VCC, VDD, VEE, and VSS

Circuit design and PCB fabrication, often encounter power symbols: VCC, VDD, VEE, VSS, what kind of relationship do they have?

First, explain

Vcc:c=circuit denotes the meaning of the circuit, i.e. the voltage of the access circuit

Vdd:d=device indicates the meaning of the device, that is, the operating voltage inside the device;

Vss:s=series indicates the meaning of a public connection, usually referred to as the circuit common ground terminal voltage

Second. description

1, for the digital circuit, VCC is the power supply voltage of the circuit, VDD is the operating voltage of the chip (usually VCC>VDD), the VSS is the pick-up location.

2. Some ICS have both a VDD pin and a VCC pin, indicating that the device itself has a voltage conversion function.

3. In the presence effector (or COMs device), VDD is the drain, VSS is the source, and Vdd and VSS refer to the component pin, not the supply voltage. DSP Communication Network DSP Learning First Forum DSP technology application and promotion Platform DSP Development Service Platform

4, generally vcc= analog power supply, vdd= Digital power supply, vss= digital ground, vee= negative power supply

Another explanation:

VCC and VDD are the power side of the device. VCC is the positive of the bipolar device, and VDD is mostly a single-stage device. The subscript can be understood as the collector C of the NPN transistor, and the drain electrode d of the PMOs or nmos field effect tube. Also you can see Vee and VSS in the circuit diagram, meaning the same. Because the mainstream chip structure is Silicon NPN, VCC is usually positive. If you use the PNP structure, VCC is negative. When choosing a chip, you must see the electrical parameters.

VCC is derived from the collector supply voltage, Collector Voltage, generally used for bipolar transistors, the PNP tube is a negative supply voltage, sometimes labeled-VCC, NPN tube is a positive voltage. DSP Communication Network DSP Learning First Forum DSP technology application and promotion Platform DSP Development Service Platform

VDD is derived from the drain supply voltage, Drain Voltage, for MOS transistor circuits, and is generally correct for power supplies. Because PMOS transistors are rarely used alone, VDD is often connected to the source of the PMOS tube in a CMOS circuit

VSS source power supply voltage, the negative power supply in the CMOS circuit, in a single supply refers to 0 volts or ground.

Vee emitter supply voltage, Emitter Voltage, is typically used for the negative supply voltages of ECL circuits.

VBB Base supply voltage for the common-base circuit of bipolar transistors. DSP Communication Network DSP Learning First Forum DSP technology application and promotion Platform DSP Development Service Platform

Explanation of the Circuit: DSP Communication network DSP Learning First Forum DSP technology application and promotion Platform DSP Development Service Platform

Single Solution:

VDD: Supply voltage (unipolar device), Supply voltage (4000 series digital circuit), drain voltage (field effect tube)

VCC: Supply voltage (bipolar device), supply voltage (74 series digital circuit), voice carrier (voice controlled Carrier)

VSS:: Ground or power negative

VEE: Negative voltage supply, field effect tube source (S)

VPP: Programming/erasing voltage.

Detailed

In an electronic circuit, VCC is the supply voltage of the circuit, and VDD is the operating voltage of the chip:

Vcc:c=circuit represents the meaning of the circuit, that is, the voltage of the access circuit, d=device means the device, that is, the operating voltage inside the device, in the ordinary electronic circuit, general VCC>VDD!

Vss:s=series indicates the meaning of a public connection, that is, the negative.

Some ICs have VCC and VDD at the same time, and the device has a voltage conversion function.

In "field effect" is the COMs element, VDD is the CMOS drain pin, VSS is the CMOS source pin, which is the component pin symbol, it does not have "VCC" name, your problem contains 3 symbols, Vcc/vdd/vss, which is clearly the circuit symbol.