7409 Quad 2-Input AND Gates IC

The 74×09 (ex 74HC09) is a chip with four open-collector AND gates. This makes it simple to connect it to other chips that use different logic levels. But it also means you can’t use this chip as a direct replacement for a normal AND gate chip. In this guide, you will learn all about this chip and how you can use its AND gates in your own circuit.

What does the 74LS09 do?

The 74×09 gives you four basic open-collector AND gates that can be used individually. An AND gate is a logic gate that outputs 1 (HIGH) only if all of its inputs are 1 (HIGH). In the truth table below, you can see what the output will be for any given input:

How To Use This Chip

The 74HC09 comes in a 14-pin package, and you need to connect it to power before you can use it. Most 7400 ICs support a VCC voltage of 5V. One difference between the HC and LS versions of the chip is that the 74HC09 supports 2V to 6V, while the 74LS09 supports only 5V. Once it has power connected, you can use any of the four AND gates inside.

This chip has open collector outputs. That means you can only sink current, not source it.

Each gate output of the 74HC09 can sink about 4 mA when powered with 5V. While the 74LS09 can usually sink about 8 mA of current. These values can vary between manufacturers of the chip though.

Specifications:

• 7409 base number
• 4.75 to 5.25V supply voltage
• 20ns propagation delay
• 0.4W power
• 14-DIP
• Operating temperature -20°C to +75°C

74×09 Pinout

The 74×09 has 14 pins and contains four open-collector AND gates laid out as shown in the pinout diagram below. Each gate has the open-collector symbol, to remind you of the type of output:

Datasheet