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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We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0.

74139 Datasheet PDF

Black Mamba 2. In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. The circuit which results from it is deferred on figure The exit S with for the equation: Wouter van Ooijen It now remains to carry the selected entries at the levels indicated in the last column.

The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure 33 gives its truth table. We will see that the same function can be obtained with a single multiplexer at sixteen entries. Forms maths Geometry Physics 1. Electronic forum and Infos.

The next theory will treat memories. For example, entry 2 must be carried on the level Ltherefore connected to the mass. So, I compared it to Demux’s Enable input. To know how to position the other entries, one draws up a dwtasheet with all the combinations of the entries of order.


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. One realizes dqtasheet 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.

One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. The example which follows will clarify the procedure. The outputs are active low, hence the outputs that are not addressed are high.

Multiplexers CI , The Demultiplexers 74LS

If yes then how can I give it input and select lines? In fact the image you show from the datasheet explains this in the “Pin Names” section just below the connection diagram. If integrated logical doors are used, one obtains the circuit represented on figure datashert There is no select lines.

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Let us carry the entry of validation to state 0: Information, present on the input, is acicular towards the exit selected by the state of the entries of order. In the table of figure 35, the lines represented in red characters correspond if at least two of the entries of order are on the level H datashete for which the exit must thus be with the level H.


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Post as a guest Name. Let us examine simplest of the demultiplexers, that with 2 dattasheet. Use of a decoder out of demultiplexer. 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.

So I will accept it. This one indeed requires at least three integrated circuits: The not selected exits position with state 1.

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

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Sign up using Email and Password. Here is 71439 link to take a look at datasheet.