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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In addition to integer data inputs, some decoders also have one or more “enable” inputs. Articles lacking sources from May All articles lacking sources.

I need to implement the function below using 3×8 decoder 74LS and a minimum number of gates but I did not see 74LS before. Binary Numerals Boolean Algebra. Sign up or log in Sign up using Google. Sincerely, The Teahlab Team. After that, we need to construct state table with excitation table.

To construct excitation table from state table you should know the excitation table of respective flip flip in this case it is T flip flop. 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 Can you draw a proper schematic for us?

We just need a switching circuit that energizes one of the eight output lines based on the combination of the input buttons. This type of decoder asserts exactly one of its n output bits, or none of them, for every integer input value. Now we know possible outputs for 3 inputs, so construct 3 to 8 decoderhaving 3 input lines, a enable input and 8 output lines.

A 1-of-n binary decoder has n output bits. Designing edcoder a phone system is straightforward. Such a public announcement phone or PA system is an example of a 3-to-8 decoder. For an illustration, see the Johnson counter. There is always more than one way to implement a switching circuit. By using our site, you acknowledge that you have read and understand dexoder Cookie PolicyPrivacy Policyand our Terms of Service. Construct 3 to 8 decoder with truth table and logic gates.


A binary decoder is usually implemented as either a stand-alone integrated circuit IC or as part decodee a more complex IC. This article does not cite any sources. We build for one output at a time to allow ourselves to catch and correct errors early.

For example, output bit number 0 is selected when the integer value 0 is applied to the inputs. Home Questions Tags Users Unanswered.

There are may possible solutions. You have two inputs labelled ‘A’ and no labels on your outputs. Code translators differ from 1-of-n decoders in that multiple output bits may be active at the same time.

3 to 8 Decoder interactive digital circuits

They are used in a wide variety of applications, including data demultiplexingseven segment displays, and memory address decoding. One variant of seven-segment decoder is the BCD to seven-segment decoderwhich translates a binary-coded decimal value into the corresponding segment control signals for input integer values 0 to 9.

Retrieved from ” https: Decoser phone has three dialing buttons A, B, C and is connected to eight different speakers, as decorer in Table 1. A block diagram of decoder consists input lines, one or more enable inputs and maximum number of output lines.

Please help improve this article by adding citations to reliable sources. Pick a Y pin and choose an input configuration that matches your function. Javascript is disabled on your decoeer. If C is set to low, then F will be Y3.

Binary decoder – Wikipedia

In the latter case the decoder may be synthesized by means of a hardware description language such as VHDL or Verilog. Greg 3, 11 Views Read Edit View history. 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 Depending on its function, a binary decoder will convert binary information from n input signals to as many as 2 n unique output signals.


To construct a decoder, we require to know the number of all possible output lines that totally depends on the given input. Its is my solution and it is not correct. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

If C is set to high, then F will be Y7. Some decoders have less than 2 n output lines; in such cases, at least one output pattern will be repeated for different input values.

The interactive output D0 of the 3 to 8 Decoder digital logic circuit, with Boolean function.

Binary decoder

We recommend that you follow the same methodology in your design projects. Look at the data sheet for example at http: Email Required, but never shown. There are several types of binary decoders, but in all cases a decoder is an electronic circuit with multiple input and multiple output signals, which converts every unique combination of input states to a specific combination of output states.

Because each line in the truth table corresponds to a specific output, and because each line in the table is unique, then we have the eight unique switching expressions that we need: So check the excitation table for T flip flop Which is: In your office is a very important and unique public announcement PA phone.