Logic gates

Logic gates[edit]

See also: Logic gates

For the symbols below: A and B are inputs, Q is output. Note: These letters are not part of the symbols.

There are variations of these logic gate symbols. Depending on the IC, the two-input gates below may have: 1) two or more inputs; 2) infrequently some have a second inverted Q output too.

• 

  Buffer

 
• 

  Inverter (NOT)

 
• 

  AND

 
• 

  NAND

 
• 

  OR

 
• 

  NOR

 
• 

  XOR

 
• 

  XNOR

The above logic symbols may have additional I/O variations too: 1) schmitt trigger inputs, 2) tri-state outputs, 3) open-collector or open-drain outputs (not shown).

• 

  Buffer gate with schmitt trigger input

 
• 

  Buffer gate with tri-state output control.
  (B is the tri-state control)

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