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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Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy darasheet cookie policyand that your continued use of the website is subject to these policies. The expressions and lead us to the logic diagram of figure Electronic forum and Infos. The next theory will treat memories. Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers.

Forms maths Geometry Physics 1.

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. Form of the perso pages. Black Mamba 2.

Since all the combinations of the entries 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.

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. Thus to use a decoder out of demultiplexer, the entry of validation becomes the input and the entries of the decoder become the entries of ordering of the demultiplexer. If one has the integrated circuitone can carry out the circuit of figure If yes then how can I give it input and select lines? 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.


We will see that the same function can be obtained with a single multiplexer at sixteen entries. The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. Let us examine simplest of the demultiplexers, that with 2 ways. Sign up using Email and Password. So, I was confused. The E enable line can be used as active low input. The example which follows will clarify the procedure. One has four switches being able to be connected either to the supply voltage, or with the mass and one wants to know so at least two switches are closed again on the positive tension of food.

Email Required, but never shown. In fact the image you show from the datasheet explains this in the “Pin Names” section just below the connection diagram. Return to the synopsis. The not selected exits position with state 1.

Electronic forum and Poem. In your first paragraph you say that a demux requires: Post as a guest Name. The outputs are active low, hence the outputs that dataaheet not addressed are high. There is no select lines.

74139 Datasheet PDF

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms dwtasheet Service. One does not find a demultiplexer with 2 ways integrated. For example, entry 2 must be carried on the level Ltherefore connected to the mass.


The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. The advantage of the multiplexer compared to the network of doors is obvious: Thanks for the answer. Home Questions Tags Users Unanswered. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure To find the equation simplest of S1let us draw the picture of Karnaugh figure The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.


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

Thanks for simplifying the answer. This one indeed requires at least three integrated circuits: For each combination of the entries of order, one defers in the column of the exit the state that this one must take. What, exactly, do you think the function of pins 1 and 15 are? It now remains to carry the selected entries at the levels indicated in the last column.

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

Here is the link to take a look at datasheet.

A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.