![]() When the base-emitter diode is turned on enough to be driven into saturation, the collector voltage with respect to the emitter may be near zero and can be used to construct gates for the TTL logic family. The use of transistors for the construction of logic gates depends upon their utility as fast switches. The output is high unless both A and B inputs are high, in which case the output is taken down close to ground potential. For the NAND logic, the transistors are in series, but the output is above them. For the OR logic, the transistors are in parallel and the output is driven high if either of the transistors is conducting. HyperPhysics***** Electricity and magnetism For the AND logic, the transistors are in series and both transistors must be in the conducting state to drive the output high.
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