Programmable Array Logic

    (PAL) A family of fuse-programmable logic
   integrated circuits originally developed by MMI.
   Registered or combinatorial output functions are modelled in
   a sum of products form.  Each output is a sum (logical or)
   of a fixed number of products (logical and) of the input
   signals.  This structure is well suited for automatic
   generation of programming patterns by logic compilers.

   PAL devices are programmed by blowing the fuses permanently
   using overvoltage.

   Today, more complex devices based on the same original
   architecture are available (CPLD's for Complex PLD's) that
   incorporate the equivalent of several original PAL chips.  PAL
   chips are, however, still popular due to their high speed.

   Generic Array Logic devices are reprogrammable and contain
   more logic gates.

   (1995-12-09)