Well, first let’s see how a 3 by 8 decoder It has 3 inputs, 8 outputs (well, pretty How do I construct a 3 to 8 line decoder using only one 2 to 4 line decoder and. Step 2. Now, it turns to construct the truth table for 3 to 8 decoder. E input can be considered as control to say, If E equals to 0 then. 3-to-8 line decoder/demultiplexer. Rev. 5 — 13 June Product data sheet. 1 General description. The 74HC; 74HCT decodes three binary weighted.

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The interactive output D0 of the 3 to 8 Decoder digital logic circuit, with Boolean function. The “address” bit number of the activated output is specified by the integer input value.

A and B pins will connect to the corresponding names from your function. Post as a guest Name. B ‘ I implement the function using a normal 3×8 decoder but I think it is not the best way to do that and I also need to use 74LS You may also like Design a 3 bit synchronous up counter using T Flip flop? Its is my solution and it is not correct. Do you have 33×8 idea about the solution?

We just need a switching circuit that energizes one of the eight output lines based on the combination of the input buttons. Greg 3, 11 Sincerely, The Teahlab Team. Look at the data sheet for example at http: I don’t know if any dedicated part is available; But the NOT gate can be implemented easily by decodre emitter switch. Pick a Y pin and choose an input configuration that matches your function.

This type of decoder asserts exactly one of its n output bits, or none of them, for every integer input value. CO Computer Organisation Construct construct 3 to 8 decoder with truth table and logic gates Design logic gate truth table. Because each line in the truth table corresponds to a specific output, and because each line in 3d8 table is unique, then we have the eight unique switching expressions that we need: An example of this is a seven-segment decoderwhich converts an integer into the combination of segment control signals needed to display the integer’s value on a seven-segment display digit.


Such a public announcement phone or PA system is an example of a 3-to-8 decoder. Please help improve this article by adding citations to reliable sources.

Sign up using Facebook. Consequently, you get to choose which section of the mall hears your announcement based on the set of buttons you press.

Due to recent changes by Oracle, java applets have become difficult to run in the browser. To design a 3x up counter, first we need to know what number of flip flops are required. Some decoders have less than 2 n output lines; in such cases, at least one output pattern will be repeated for different input values. If C is set to high, then F will be Y7.

3 to 8 Decoder interactive digital circuits

Home Questions Tags Users Unanswered. In your office is a very important and unique public announcement PA phone. And in reality which way you choose will likely depend on what chips you have available. Construct 3 to 8 decoder with truth table and logic gates.

Although pre—packaged decoders, such as this 3—to—8 decoder, may be sufficient for your need; there will be cases when they will be too expensive for one reason or another.

By Sandeep Verma – August 30, Sign up using Email and Password. From Wikipedia, the free encyclopedia. Javascript is disabled on your browser. Imagine you are a mall 38 guard. Look up decoder in Wiktionary, the free dictionary. A block diagram of decoder consists input lines, one or more enable inputs and maximum number of output lines. Therefore, building for one output at a time, we will implement our circuit.


There is always more than one way to implement a switching circuit. Your browser does not support iframes. Widely used decoders are often available in the form of standardized ICs. Sincerely, The Teahlab Team Javascript is disabled on your browser. By Sandeep Verma – August 31, Now we know possible outputs for 3 inputs, so eecoder 3 to 8 decoderhaving 3 input lines, a enable input and 8 output lines.

In addition to integer data inputs, some decoders also have one or more “enable” inputs. A 1-of-n binary decoder has n output bits.

You have two inputs labelled ‘A’ and no labels on your outputs. Can you draw a proper decodeer for us? A binary decoder is usually implemented as either a stand-alone integrated circuit Decoer or as part of a more complex IC.

Binary decoder

The phone has three dialing buttons A, B, C and is connected to eight different speakers, as shown in Table 1. Binary Numerals Boolean Algebra. By using 3c8 site, you agree to the Terms of Use and Privacy Policy.

Views Read Edit View history. I implement the function using a normal 3×8 decoder but I think it is not the best way to do that and I also need to use 74LS