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. Now let us carry the entry of validation to state 1: Post Your Answer Discard By datasheeet “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.

So, I compared it to Demux’s Enable input. The E enable line can be used as active low input.

74139 Datasheet PDF

Electronic forum and Infos. The circuit which results from it is deferred on figure The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension.

To find the equation simplest of S1let us draw the picture of Karnaugh figure For each combination, one indicates the logical level that must take the exit.

In your first paragraph you say that a demux requires: Click here for the following lesson or in the synopsis envisaged to this end.

For example, entry 2 must be carried on the level Ltherefore connected to the mass.

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

Post as a guest Name. 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. The integrated circuit 74LS contains two demultiplexers with 4 ways.


This one indeed requires at least three integrated circuits: What, exactly, do you think the function of pins 1 and 15 are? Figure 43 illustrates how one passes from a decoder to a demultiplexer.

Electronic forum and Poem. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.

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

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

To contact the author. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. Sign up using Facebook. Form of the perso pages. I just better understood the concept from you than from Tom’s answer.

Information, present on datashee input, is acicular towards the exit selected by the state of the entries of order. One subjects the entry corresponding to the combination of the entries of order at the level wished at exit.

In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. The outputs are active low, hence the outputs that are not addressed are high.

This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries. The not selected exits position with state 1. The advantage of the multiplexer compared to the network of doors is obvious: In the logic diagram of the 74LS, you have exactly that. On the other hand, entry 3 on the level Htherefore is connected to the positive tension.


Static page of welcome. 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. We will see that the same function can be obtained with a single multiplexer at datasheft entries.

So, I was confused. 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. One does not find a demultiplexer with 2 ways integrated. The expressions and lead us to the logic diagram of figure 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. If yes then how can I give it input and select lines? Thanks for simplifying the answer.

Use of a decoder out of demultiplexer. Home Questions Tags Users Unanswered. 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.