Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may. r/Demultip lex e r. 74LS / 74LSSMD / 74LS Decoder/Demultiplexer. General Description. These Schottky-clamped circuits are designed to be used.

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The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. If datadheet has the integrated circuitone can carry out the circuit of figure Sign up using Facebook.

This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.

74139 Datasheet PDF

Use of a decoder out of demultiplexer. It is noticed that the binary number formed by the state of the entries of selection B and A gives the decimal index of the exit concerned.

The example which follows will clarify the procedure. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes.

In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. Electronic forum and Poem. The exit S with for the equation: Return to the synopsis.

Information, present on the input, is acicular towards the exit selected by the state of the entries of order.


The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. One has four switches being able to be connected either to the supply voltage, or with datasheet mass and one wants to know so at least two switches are closed again on the positive tension of food.

The E enable line can be used as active low input.

In your first paragraph you say that a demux requires: Before taking a look at demux, I actually took a look at mux’s datasheet, where I saw an Enable input, to enable or disable mux. Now let us carry the entry of validation to state 1: It datahseet remains to carry the selected entries at the levels indicated in the last column.

The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways datasehet presented at figure How to make a site? If yes then how can I give it input and select lines? Since all the combinations of the datsheet A, B, C and D are present in this equation, we can fulfill with this multiplexer any switching function comprising the same number of entries, that is to say 4.

In fact the image you show from the datasheet explains this in the “Pin Names” section just below the connection diagram. This one indeed requires datasheft least three integrated circuits: According to what was known as before, the four switches are connected to the four entries of order D, C, B, A of the multiplexer.

Electronic forum and Infos. In the logic diagram of dztasheet 74LS, you have exactly that. There is no select lines.


Your explanation dataheet my confusion. The advantage of the multiplexer compared to the network of doors is obvious: The two groupings and D give us the following equation of S1: One does not find a demultiplexer with 2 ways integrated.

(Datasheet) pdf – Dual 2 to 4 Demultiplexers (1-page)

The outputs are active low, hence dtasheet outputs that are not addressed are high. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use datwsheet the website is subject to these policies. Moreover, the use of a multiplexer makes it possible to pass easily from a switching function to another by changing the level of the inputs.

Post as a guest Name. So I will accept it.

To know how to position the other entries, one draws datqsheet a table with all the combinations of the entries of order. So, I compared it to Demux’s Enable input.

– Dual 2-to-4 line decoder/demultiplexer – ChipDB

Figure 43 illustrates how one passes from a decoder to a demultiplexer. Forms maths Geometry Physics 1. Form of the perso pages. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. If integrated logical doors are used, one obtains the circuit represented on figure