Digital Logic Gates

The NOR Gate

  1. The NOR gate is an improved logic element used for implementing decision-making logic functions.
  2. The term NOR is a contraction for the expression NOT-OR.
  3. The NOR gate combines the functions of the NOT and OR gates.
  4. The output expression is the inverted OR function.
  5. The Standard Digital Logic symbol for the NOR gate:

    [nor1.gif]


  6. The Boolean expression for the NOR gate above is [nor2.gif]. The expression is read as E equals NOT C OR D or E equals C OR D NOT.
  7. A common truth Table for the NOR gate: