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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So, I compared it to Demux’s Enable input.

The example which follows will clarify the procedure. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. If one has the integrated circuitone can carry out the circuit of figure After that I have taken a look at the datasheet of 1: Information, present on the input, is acicular towards the exit selected by the state of the entries of order.

The integrated circuit 74LS contains two demultiplexers with 4 ways. How to make a site?

74139 Datasheet PDF

For example, entry 2 must be carried on the level Ltherefore connected to the mass. In the logic diagram of the 74LS, you have exactly that.


The not selected exits position with state 1. The circuit which results from it is deferred on figure Thanks for simplifying the answer. There is no select lines. 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.

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

For each combination of the entries of order, one defers in the column of the exit the state that this one must datasyeet. The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure If integrated logical doors are used, one obtains the circuit datasjeet on figure The outputs are active low, hence the outputs that are not addressed are high.

One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. Wouter van Ooijen Thus to use a decoder out of demultiplexer, the entry of validation becomes the input and the entries of the decoder become the datazheet of ordering of the demultiplexer. 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. Click here for the following lesson or in the synopsis envisaged to this end.


Let us examine simplest of the demultiplexers, that with 2 ways. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes.

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. In your first paragraph you say that a demux requires: The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. One does not find a demultiplexer with 2 744139 integrated. Sign up or log in Sign up using Google.

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