Digital logic gates

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Digital logic gates

  1. 1. Digital Logic Gates<br />
  2. 2. Definition<br />An electronic device that makes logical decisions based on the different combinations of digital signals present on its inputs.1<br />Digital Logic<br />True = 1<br />False = 0<br />1) Storr, Wayne (2010)., “Basic Electronics Tutorials”, (accessed 03 August 2011) Available from: http://www.electronics-tutorials.ws/logic/logic_1.html<br />
  3. 3. AND Gate<br />Digital Logic Gate that requires all inputs (A AND B) to be TRUE for the output to be TRUE<br />Boolean Algebra A * B<br />Transistor- 7408<br />Schematic<br />Truth Table<br />
  4. 4. OR Gate<br />Digital Logic Gate that requires one input (A OR B) to be TRUE for the output to be TRUE<br />Boolean Algebra A + B<br />Transistor- 7432<br />Schematic<br />Truth Table<br />
  5. 5. XOR Gate<br />Digital Logic Gate that requires only one input (A or B but not both) to be TRUE for the output to be TRUE<br />Boolean Algebra A + B<br />Transistor- 7486<br />Schematic<br />Truth Table<br />
  6. 6. Inverter (aka NOT) Gate<br />Digital Logic Gate that inverts the input TRUE inverts to FALSEFALSE inverts to TRUE<br />Boolean Algebra A<br />Transistor- 7404<br />Schematic<br />Truth Table<br />
  7. 7. NAND Gate<br />Digital Logic Gate that requires all inputs (A AND B) to be TRUE for the output to be FALSE<br />Inverse of AND Gate<br />Boolean Algebra A * B<br />Transistor- 7400<br />Schematic<br />Truth Table<br />
  8. 8. NOR Gate<br />Digital Logic Gate that requires one input (A OR B) to be TRUE for the output to be FALSE<br />Inverse of OR Gate<br />Boolean Algebra A + B<br />Transistor- 7402<br />Schematic<br />Truth Table<br />
  9. 9. XNOR Gate<br />Digital Logic Gate that requires only one input (A or B but not both) to be TRUE for the output to be FALSE<br />Inverse of XOR Gate<br />Boolean Algebra A + B<br />Transistor- 74266<br />Schematic<br />Truth Table<br />

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