NAND GATE

  • It is a NOT – AND gate.
  • By connecting a NOT gate in the output of an AND gate we get NAND gate.
  • Its output is given Boolean equation
  • This gate gives an output of 1 if its both inputs are not 1,  means output will be 1 if either A or B or both are 0.

NAND GATE IS A UNIVERSAL GATE

  • NAND gate is also called universal gate because it can perform all the three logic function of an OR gate, AND gate and inverter.

XNOR GATE

  • It is known as a not-XOR gate
  • Its logic function and truth table are just the reverse of those for XOR gate.
  • This gate has an output 1 if its both inputs are either 0 or 1.
  • It means to get an output 1 , its both inputs should be at the same logic level of either 0 or 1.
  • So it produces no output (0) if its two input are at the opposite logic level.

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