Памятка: Vcc, Vdd

18 Dec 2012

V_CC – Voltage Collector Collector. Positive supply voltage.
V_DD – Voltage Drain Drain. Positive supply voltage.
V_EE – Voltage Emitter Emitter. Negative supply, ground.
V_SS – Voltage Source Source. Negative supply, ground.

V_CC – For TTL circuitry, this is the +5 volts which sits on the collector of the bi-polar transistor output circuit.
V_DD – For CMOS circuitry (like the PIC) this is the +5 (or +3) voltage that sits on the ‘drain’ of a MOS-FET transistor output circuit.
V_EE – For TTL circuitry, this is the GND which sits on the emitter of a bi-polar transistor output circuit.
V_SS – For CMOS circuitry, this is the GND that sits on the ‘source’ of a MOS-FET transistor output circuit.