What do vss and vdd mean?

What do vss and vdd mean?

1. In the circuit:

1. VDD means: power supply voltage (unipolar device); power supply voltage ( 4000 series digital circuit); drain voltage (field effect transistor).

2. VCC means: power supply voltage (bipolar device); power supply voltage (74 series digital circuit); voice controlled carrier (Voice Controlled Carrier).

3. The meaning of VSS: usually refers to the voltage of the common ground terminal of the circuit or the negative pole of the power supply.

4. VEE means: negative voltage power supply; the source (S) of the field effect transistor.

2. On the transistor in the circuit:

1. VSS indicates the source (Source) connected to the field effect transistor power supply.

#2. VDD represents the power supply connected to the drain (Drain) of the field effect transistor.

3. VEE represents the power supply connected to the transistor emitter (Emitter).

4. VCC represents the power supply connected to the transistor collector (Collector)

Extended information:

The TIA/EIA-568-A standard stipulates that connecting multiple IDFs (intermediate wiring rooms) to the main MDF (main wiring room) must be connected through vertical cabling, also called backbone cabling. VCC usually uses optical fiber because the length of vertical cabling is usually longer than the 100m limit of Category 5e twisted pair.

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, access The voltage of the circuit, D=device means the device, that is, the working voltage inside the device. In ordinary electronic circuits, generally Vcc>Vdd!

VSS: S=series means the public connection, that is negative electrode.

Some ICs have both VCC and VDD. This device has a voltage conversion function.

In the "field effect" COMS component, VDD is the drain pin of CMOS, and VSS is the source pin of CMOS. This is the component pin symbol, and it does not have the name "VCC".

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