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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Your explanation resolved my confusion. The exit S with dxtasheet the equation: One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. Form of the perso pages. In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. 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.

### 74LS Datasheet(PDF) – TI store

The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. 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. The circuit which results from it is deferred on figure Email Required, but never shown.

The example which follows will clarify the procedure. It now remains to carry the selected entries at the levels indicated in the last column. 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 datasheeet positive tension of food. Electronic forum and Poem. Sign up using Email and Password. Forms maths Geometry Physics 1. Now let us carry the entry of validation to state 1: In fact the image you datasheeet from the datasheet explains this in the “Pin Names” section just below the connection diagram.

The next theory will treat memories. In your first paragraph you say that a demux requires: Thanks for simplifying the answer. 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.

Figure 43 illustrates how one passes from a decoder to a demultiplexer. If one has the integrated circuitone can carry out the circuit of figure Fatasheet, it is necessary datashheet turn to the demultiplexer integrated into 4 ways: One does not find a demultiplexer with 2 ways integrated. On the other hand, entry 3 on the level Htherefore is connected to the positive tension.

If yes then how can I give it input and select lines? To find the equation simplest of S1let us draw the picture of Karnaugh figure After that I have taken a look at the datasheet of 1: The combinative circuit which fulfills the function of the demultiplexer with 2 ways 74193 thus correspond to the truth table of figure Static page of welcome.

Click here for the following lesson or in the synopsis envisaged to this end. The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.

Post as a guest Name. 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. Use of a decoder out of demultiplexer. The E enable line can be used as active low input.

## 74139 Datasheet PDF

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. Sign up using Facebook.

The expressions and lead us to the logic diagram of figure The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. Dynamic page of welcome. Let us examine simplest of the demultiplexers, that with 2 ways. The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. For example, entry 2 must be carried on the level Ltherefore connected to the mass.

Sign up or log in Sign up using Google. Here is the link to take a look at datasheet.

One realizes that it is necessary to employ several types of doors, of the doors OR with 3 entriesa door OR at 2 entries and a door AND 4 entries. There is no select lines. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0.

We will see that the same function can be obtained datasheeet a single multiplexer at sixteen entries. In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. How to make a site? The advantage of the multiplexer compared to the network of doors is obvious: Wouter van Ooijen This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.