![]() The designations do not always depend on the actual internal structure and can be “mixed”. In some mikruhs, you can see both types of designation on different legs at the same time. It is often shown that different supply voltages are needed (for example, the Intel 8080 had VCC = +5 V, VDD = +12 V and VEE = -5 V). It so happened that npn- and n-channel transistors were more often used, in which a positive voltage must be applied to the collector / drain, and a negative voltage to the emitter / source, so the “polarity” is like that. circuits with Vdd and Vss are built on field-effect transistors, hence D (drain, drain) and S (source, source).Vcc and Vee refer to circuits built on bipolar transistors, hence the letters C (collector, collector) and E (emitter, emitter) . ![]()
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