NAND gate is designed by the combination of AND, & NOT gates. Bubbled OR gate is called a NAND gate. The IC number of the NAND Gate is 7400.
Truth table of NAND gate
If one of the inputs in the NAND gate is low then the output is high. If the two inputs of the NAND gate are high then the output is low. The output of the AND gate is a complement to the NAND gate. NAND gate is the universal gate so, by using one NAND gate we implement one NOT gate, by using two NAND gates we implement one AND gate, by using three NAND gates we implement one OR gate, by using four NAND gates we can implement one NOR, X-OR gates and by using of five NAND gates we implement one X-NOR gate.