Theory
NAND is the inverse of the AND gate giving an output that is the opposite of the AND function. A two input gate may be expressed as: X A B X A B = • = The Figure L4-1 shows the NOR gate symbols together with its truth table. NAND gate can convert to all simple logic gates similar NOR gates as follows : NOT gate conversion with connect both inputs together followign the Figure L4-2 AND gate conversion connect 2 NAND gates. One acts simple NAND gate, another acts NOT gate following the Figure L4-3. The Boolean expression for this conversion will be: