Meanings of VCC, VDD, Vee, VSS, and VPP

 

Meanings of VCC, VDD, Vee, VSS, and VPP

Version 1:

To put it simply, we can understand it as follows:

I. Explanation

VCC: c = circuit indicates the circuit, that is, the voltage of the access circuit;
VDD: D = device indicates the device's internal operating voltage;
VSS: S = series indicates the public connection, which usually refers to the public grounding terminal voltage of the circuit;
Vee: negative voltage power supply;
VPP: programming/erasure voltage.

Ii. Description

1. for digital circuits, VCC is the power supply voltage of the circuit, VDD is the operating voltage of the chip (usually VCC> VDD), and VSS is the grounding point.
2. Some ICS have both VDD pins and VCC pins, indicating that the device itself has a voltage conversion function.
3. In an FET (or coms device), VDD is the drain pole, VSS is the source pole, and VDD and VSS are the component pins, not the power supply voltage.

Version 2:

VPP: programming/erasure voltage.
Vee: negative voltage power supply; source pole of the FET (s)
VSS: ground or power supply negative pole
VCC: Power Supply voltage (bipolar device), power supply voltage (74 Series Digital Circuits), voice control carrier (voice controlled carrier)
VDD: Power Supply voltage (Single Pole device), power supply voltage (4000 Series Digital Circuits), drain voltage (FET)

Version 3:

Generally, VCC and VDD are positive power supplies, while Vee and VSS are negative or local power supplies.
VSS indicates the power of the source pole (s) connected to the Fet.
VDD indicates the power supply of the drain pole (d) connected to the Fet.
Vee indicates the power supply connected to the transistor emission pole (e.
VCC indicates the power supply connected to the transistor collector (c.
They are named like this:
VCC, VDD, Vee, and VSS are the power supply junction of chips and decomposition circuits. the polarity of detailed power supply depends on the device material. VCC generally refers to a transistor C pole directly connected to an integrated or decomposed circuit, and Vee refers to an E pole connected to a transistor in an integrated or decomposed circuit. Similarly, VDD and VSS are the D and S poles connected to the inner and decomposed circuit. For example, if the integration is made of P trench E/DMOs process, its VDD should be connected to the negative power supply, while VSS should be connected to the positive power supply.

Version 4:

VCC and Vee appear in the dual-pole transistor circuit, and are related to the Collector emission pole (emitter), so they are positive and negative.
The appearance of VDD and VSS in the mos circuit is related to drain and source, which is also positive and negative.
VCC and VDD are the power ends of the device. VCC is the positive of bipolar devices, and most of the VDD is the positive (for example, diode) of a single-stage device ). The subscript can be understood as the Collector C of the rejection transistor, And the drain D of the PMOS or nmos fet. You can also see Vee and VSS in the circuit diagram, with the same meaning. Because the mainstream Chip structure is silicon, The VCC is usually positive. If the PNP structure is used, VCC is negative. We recommend that you check the electrical parameters when selecting a chip.
In single-chip microcomputer, most VPP is defined as a programming voltage. In some documents, vddf is used as the external voltage for flash power supply.

 

Summary: these four versions tell us the differences between VCC, VDD, Vee, VSS, and VPP in two aspects. The first two versions have one aspect, and the last two versions have one aspect to complement each other.