NOT gate
| INPUT A |
OUTPUT NOT A |
| 0 | 1 |
| 1 | 0 |
A NOT gate (also often called Inverter) is a logic gate. Each NOT gate has only one input signal. Logically with NOT gates, the input and the output swap, so if you input 1 it outputs as 0; likewise if you input 0 it outputs as 1.The NOT gate negates the values of data or signal in its input. It will always output the opposite signal. Its main function is to interchange logic.
In the 20th century an inverter was often made of a discrete transistor with other components, or several inverters were packaged in an integrated circuit.
Symbols
There are three symbols for the NOT gate:
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|
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| MIL/ANSI Symbol | IEC Symbol | DIN Symbol |
NOT Gate Media
Traditional NOT gate (inverter) symbol
This schematic diagram shows the arrangement of NOT gates within a standard 4049 CMOS hex inverting buffer.
A labelled MIL/ANSI symbol for an Buffer. A is the input, Q is the output
Diagram showing a way of making a logical inverter (NOT gate) from a NAND gate.
Diagram showing a way of making a NOT gate from NOR gates.
Voltage transfer curve for a 20 μm inverter fabricated at North Carolina State University
Related pages
- OR gate
- AND gate
Other websites
- The Not Gate on All About Circuits
