Introduction to Logic Gates

Inverter

As the name implies, inverter will invert the number entered. If you enter “0”, you will get a “1” on its output, and if you enter a “1”, you will get a “0” on its output. The inverter symbol you can see in Figure 1. Inverter gate is also known as NOT and its output is Y = /A.

Inverter GateFigure 1: Inverter.

On the truth table below you can see a summary of how this circuit works.

A (Input)  Y (Output)
0 1
1 0


On logic circuits, a “o” symbol is a short for inverter. You will see that on logic gates like NAND, NOR and XNOR.

The most famous inverter integrated circuit is 7404 and you see its pinout in Figure 2. It has six inverters inside. To make this integrated circuit work, you need to connect it to a 5 V power supply.

7404 ICFigure 2: 7404 integrated circuit provides six inverters.

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Author: Gabriel Torres

Gabriel Torres is a Brazilian best-selling ICT expert, with 24 books published. He started his online career in 1996, when he launched Clube do Hardware, which is one of the oldest and largest websites about technology in Brazil. He created Hardware Secrets in 1999 to expand his knowledge outside his home country.

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