Universal Gate

UNIVERSAL GATE

The NAND and NOR gates are known as universal gates, since any logical function can be implemented using NAND (or) NOR gates.

NAND Gates:

The NAND gate can be constructed all the basic gates AND, OR and NOT.

NAND Gate as AND:

An AND gate function can be generated using only NAND gates. It is generated by simply inverting output of NAND gate AB = AB.

NAND gate as OR function:

The OR function is generated using NAND only.

NAND Gate as NOT Function

NAND gate both inputs are connected together and create NOT function.

NOR Gate:

Similar to NAND gate, the NOR gate is also a universal gate, since it can be used to form the all basic gates AND, OR and NOT gates.

NOR Gate as AND Gate Function

AND function is generated using only NOR gates

The above equation is implemented using only NOR gate, it is shown in fig.

The truth table of above function shown in table 4.13