(TTL) A common semiconductor technology for building discrete digital logic integrated circuits. It originated from {Texas Instruments} in 1965. There have been several series of TTL logic: 7400: 10 ns propagation time, 10 mW/gate power consumption, obsolete 74L00: Low power: higher resistances, less dissipation (1 mW), longer propagation time (30 ns) 74H00: High power: lower resistances, more dissipation: less sensitivity for noise 74S00: Schottky-clamped: faster switching (3 ns, 19 mW) by using Schottky diodes to prevent the transistors from saturation 74LS00: Low power, Schottky-clamped (10 ns, 2 mW) 74AS00: Advanced Schottky: faster switching, less dissipation, (1.5 ns, 10 mW) 74ALS00: Advanced Low power Schottky (4 ns, 1.3 mW). For each 74xxx family there is a corresponding 54xxx family. The 74 series are specified for operation at 0 - 70 C whereas the 54 (military) series can operate at -55 - 125 C See also ref="module.php?name=Lexikon&file=search&eid=1&query=CMOS">CMOS, ref="module.php?name=Lexikon&file=search&eid=1&query=ECL">ECL.

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