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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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. 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. 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.

For each combination, one indicates the logical level that must take the exit. There is no select lines.

74139 Datasheet PDF

Here is the link to take a look at datasheet. We dxtasheet that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0.

How to make a site? The next theory will treat memories.

Multiplexers CI , The Demultiplexers 74LS

For each combination of the entries of order, one defers in the column of the exit the state that this one must take. Sign up using Facebook. Form of the perso pages. Your explanation resolved my confusion.


Thanks for the answer. Let us carry the entry of validation to 774139 0: The example which follows will clarify the procedure. Use of a decoder out of demultiplexer. One does not find a demultiplexer with 2 ways integrated. One realizes that it is necessary to employ several dayasheet of doors, of the doors OR with 3 entriesa door OR at 2 entries and a door AND 4 entries. Figure 43 illustrates how one passes from a decoder to a demultiplexer.

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

Let us examine simplest of the demultiplexers, that with 2 ways. To contact the author. Now let us carry the entry of validation to state 1: Sign up using Email and Password. The E enable line can be used as active low input. Post as a guest Name. If integrated logical doors are used, one obtains the circuit represented on figure Forms maths Geometry Physics 1.

Thanks for simplifying the answer.

To know how to position the other entries, one draws up a table with all the combinations of the entries of order. Static page of welcome. 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.

The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure 71439 gives its truth table. On the other hand, entry 3 on the level Hdatawheet is connected to the positive tension. The integrated circuit 74LS contains two demultiplexers with 4 ways.


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Wouter van Ooijen It now remains to carry the selected entries at the levels indicated in the last column.

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. After that I have taken a look at the datasheet of 1: Information, present on the input, is acicular towards the exit selected by the state 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.

Return to the synopsis. 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. Dynamic page of welcome. Email Required, but never shown.

In addition to the commutation of several logical signals, the multiplexer can be used to replace a dayasheet. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.

The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure The expressions and lead us to the logic diagram of figure Black Mamba 2. This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.