74HC238 PDF

CD54/74HC, CD54/74HCT High-Speed CMOS Logic 3- to 8-Line Decoder/. Demultiplexer Inverting and Noninverting. [ /Title. (CD HC,. CD The M74HC is a high speed CMOS 3 to 8 line decoder. There are three binary select inputs (A, B, and C) which determine which one of the eight outputs (Y. 74HC Datasheet, 74HC 3 to 8 Line Decoder/Demultiplexer Datasheet, buy 74HC

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If the address pins have a value ofthis equates to the first 2 LEDs being on. If the address pins have a value ofthis equates to the first 3 LEDS being on.

So if all address pins are connected to ground, this gives a value of So they are declared outputs. How the circuit works is the pushbuttons control the outputs. These address pins control which output pins turn on. This is because we are writing to them with the arduino, not reading from them.

But a 74HC is a very useful chip that has a lot of capabilities.

If the address pins have a value ofthis equates to the first 5 LEDs being on. And this how the address pins can affect all 8 outputs. If the address pins have a value ofthis equates to the first 4 LEDs being on.

How to Build a 74HC238 3-to-8 Decoder Circuit

These are the pins which are used to control the outputs of the chip. How the circuit works is the pushbuttons control the outputs. If we push down on the first 2 pushbuttons attached to A0 and A1, this gives a value of to the address registers.

The rest of the 7hc238, Y0 to Y7, are the output pins. If we press down on the pushbuttons, the corresponding LEDs will turn on in a binary-to-decimal format.

How to Connect a 74HC238 3-to-8 Decoder to an Arduino

With just 3 pins on the microcontroller being used, it adds 8 outputs. The pinout of the 74HC is shown below.

It is a 8-pin chip. So if all address pins are connected to ground, this gives a value of But once you do, it’s very simple and straightforward to work.

In this project, we will show how a 74HC decoder works and how we can manually control it with 3 pushbuttons. Then it repeats back from the beginning.

Our output devices will be LEDs. The rest of the pins, Y0 to Y7, are the output pins. The address pins are kind of the center of control. If we press down on the pushbuttons, the corresponding LEDs will turn on in a binary-to-decimal format.

If the address pins have a value ofthis equates to 74ch238 first 4 LEDs being on. So if we have an address pin connected to ground, it has a value of 0.

If the address pins have a value ofthis equates to the first LED being on.

How to Connect a 74HC 3-to-8 Decoder/Demultiplexer to an Arduino

To each of these pins, we connect a pull-down resistor. So when the address pins are5 LEDs will be on. If the address pins have a value ofthis equates to the first 2 LEDs being on.

So if we have an address pin connected to ground, it has a value of 0. So if all address pins are HIGH, this equates to a value ofwhich in decimal is 7. So if all address pins are HIGH, this equates to a value ofwhich in decimal is 7.

These address pins control which output pins turn on.