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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The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure 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.

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One does not find a demultiplexer with 2 ways integrated. So, I compared it to Demux’s Enable input. I just better understood the concept from you than from Tom’s answer. To find the equation simplest of S1let us draw the picture of Karnaugh figure The E enable line can be used as active low input. The two groupings and D give us the following equation of S1: For each combination of the entries of order, one defers in the column of the exit the state that this one must take.


To know how to position the other entries, one draws up a table with all the combinations of the entries of order. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

74139 Datasheet PDF

The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. Electronic forum and Poem.

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 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 not selected exits position with state 1. Sign up or log in Sign up using Google. In addition to the commutation of several logical signals, the multiplexer can be used to replace a network.

The circuit which results from it is deferred on figure Dayasheet here for the following lesson or in the synopsis envisaged to this end. Static page of welcome.


This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries. Figure 43 illustrates how one passes from a decoder to a demultiplexer. After that I have taken a look at the datasheet of 1: This one indeed requires at least three integrated circuits: Sign up using Email and Password. Home Questions Tags Users Unanswered.

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

Post as a guest Name. 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.

If yes then how can I give it input and select lines? So, I was confused. 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.

In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder.