<P> The inverter is a basic building block in digital electronics . Multiplexers, decoders, state machines, and other sophisticated digital devices may use inverters . </P> <P> The hex inverter is an integrated circuit that contains six (hexa -) inverters . For example, the 7404 TTL chip which has 14 pins and the 4049 CMOS chip which has 16 pins, 2 of which are used for power / referencing, and 12 of which are used by the inputs and outputs of the six inverters (the 4049 has 2 pins with no connection). </P> <P> If no specific NOT gates are available, one can be made from NAND or NOR gates, because NAND and NOR gates are considered the "universal gates", meaning that they can be used to make all the others . </P> <Table> <Tr> <Th> Desired gate </Th> <Th> NAND construction </Th> <Th> NOR construction </Th> </Tr> <Tr> <Td> </Td> <Td> </Td> <Td> </Td> </Tr> </Table>

How can a nand gate be used as an inverter
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