Digital Logic Gates

The XOR Gate

  1. Another basic logic element is the XOR gate:

  2. TheStandard Digital Logic symbol for a XOR gate:

    [xor1.gif]

  3. An XOR gate can have 2 or more inputs and a single output.
  4. The XOR gate output is binary 1 if any one of the inputs are binary 1.
  5. The XOR gate output is binary 0 when all inputs are binary 0 or 1.
  6. A circle with a plus sign [xor2.gif] is used to signify the logical XOR function.
  7. The output for the XOR gate pictured is read as, Y is exclusively A or B.
  8. The Truth Table for the XOR gate:

    [1ttxor1.gif]