transistor-transistor logic

1 definition found

transistor-transistor logic - Free On-line Dictionary of Computing (26 May 2007) :

  Transistor-Transistor Logic
  
     (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 CMOS, ECL.