![]() TTL manufacturers offered a wide range of logic gate, flip-flops, counters, and other circuits. Īfter their introduction in integrated circuit form in 1963 by Sylvania, TTL integrated circuits were manufactured by several semiconductor companies, with the 7400 series (also called 74xx) by Texas Instruments becoming particularly popular. ![]() ![]() The designation TTL is sometimes used to mean TTL-compatible logic levels, even when not associated directly with TTL integrated circuits, for example as a label on the inputs and outputs of electronic instruments. TTL is notable for being a widespread integrated circuit (IC) family used in many applications such as computers, industrial controls, test equipment and instrumentation, consumer electronics, synthesizers, etc. It is called transistor–transistor logic because both the logic gating function (e.g., AND) and the amplifying function are performed by transistors (contrast with Resistor–transistor logic (RTL) and Diode–transistor logic (DTL)). Transistor–transistor logic ( TTL) is a class of digital circuits built from bipolar junction transistors (BJT) and resistors. A Motorola 68000-based computer with various TTL chips mounted on breadboards.
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