### Other gates made with NAND

Source :: http://www.doctronics.co.uk/4011.htm

An important property of NAND gates is that they can be linked to perform the functions of other logic gates. In fact, any logic function can be implemented using *only* NAND gates:

If you have designed a system which needs a NAND gate, a NOT gate and an AND gate, you might think of using a separate integrated circuit for each logic function. This would leave you with a circuit in which there were three unused NAND gates, five unused NOT gates and three unused AND gates. It is a lot more efficient (and cheaper) to use NAND gates to implement the other functions. All three gates can be made with just one 4011 integrated circuit.