Buie of TRW, "particularly suited to the newly developing integrated circuit design technology", and it was originally named transistor-coupled transistor logic (TCTL). Successors to the original bipolar TTL logic often are interchangeable in function with the original circuits, but with improved speed or lower power dissipation.Ī real-time clock built of TTL chips around 1979. TTL chips are now also made in surface-mount packages. TTL devices were originally made in ceramic and plastic dual-in-line (DIP) packages, and flat-pack form. Even after much larger scale integrated circuits made multiple-circuit-board processors obsolete, TTL devices still found extensive use as the "glue" logic interfacing more densely integrated components. TTL became the foundation of computers and other digital electronics. The design of the input and outputs of TTL gates allowed many elements to be interconnected. TTL circuits simplified system design compared to earlier logic families, offering speed superior to RTL. Several variations of the original bipolar TTL concept were developed, yielding circuits with higher speed or lower power dissipation to allow optimization of a design. 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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