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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High of page Preceding page Following page. 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 and for which the exit must thus be with the level H. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have fatasheet our updated terms of serviceprivacy policy and cookie policyand that your 741399 use of the website is subject to these policies.

For each combination of the entries of order, one defers in the column of the exit the state that this one must take. Electronic forum and Infos.

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

In your first paragraph you say that a demux requires: We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. 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. To determine how to connect the sixteen inputs, it is enough to follow the described procedure and to build a table with sixteen lines like that of figure One does not find a demultiplexer with 2 ways integrated.


The outputs are active low, hence the outputs that are not addressed are high. The circuit which results from it is deferred on figure Email Required, but never shown. If integrated logical doors are used, one obtains the circuit represented on figure Let us carry the entry of validation to state 0: So I will accept it.

74139 Datasheet PDF

After that I have taken a look at the datasheet of 1: By using our site, dataseet acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension.

What, exactly, do you think the function of pins 1 and 15 are? In addition to the commutation of several logical signals, the 7413 can be used to replace a network.

In fact the image you show from the datasheet explains this in the “Pin Names” section just below the connection diagram. Thanks for the answer.


The E enable line can be used as active low input. Sign up using Email and Password. Wouter van Ooijen This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries.

Multiplexers CI , The Demultiplexers 74LS

daatsheet Figure 43 illustrates how one passes from a decoder to a demultiplexer. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. Use of a decoder out of demultiplexer. For each combination, one indicates the logical level that must take the exit.

Home Questions Tags Users Unanswered. 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. The expressions and lead us to the logic diagram of figure It now remains to carry the selected entries at the levels indicated in the last column.

We will see that datadheet same function can be obtained with a single multiplexer at sixteen entries. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.

The next theory will treat memories. So, I was confused.

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