Transistor-Transistor Logic (Transistor-Transistor Logic or simply TTL) is a class of digital circuits built from bipolar junction transistors (BJT), and resistors. This is called transistor-transistor logic occur because both functions and logic gate transistors for amplification (in contrast with RTL and DTL). It is notable for being a widespread family of integrated circuits (IC) used by many applications such as computers, industrial control, consumer electronics, synths etc.. Because of the large use of this logic family, input and output electronics can be called in or out "TTL" significantly compatible with the voltage levels used.
These circuits have as main characteristic the use of 5-volt signal to logic levels high. Their integrated circuits are made up mostly of transistors, which makes them very sensitive to static electricity.
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