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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Since all the combinations dtasheet 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 diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure High of page Preceding page Following page.

In the logic diagram of the 74LS, you have exactly that. Let us examine simplest of the demultiplexers, that with 2 ways.

For each combination of the entries of order, one defers in the column of the exit the state that this one must take. Form of the perso pages. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The outputs are active low, hence the outputs that are not addressed are high. Sign up using Email and Password.

After that I have taken a look at the datasheet of 1: Now let us carry the entry of validation datashedt state 1: If yes then how can I give it input and select lines?


The integrated circuit 74LS contains two demultiplexers with 4 ways. Return to the synopsis. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0. Datasheft, exactly, do you think the function of pins 1 and 15 are?

74139 Datasheet PDF

The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table. Here is the link to take a look at datasheet. The example which follows will clarify the 74193. To contact the author.

Wouter van Ooijen 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. To know how to position catasheet other entries, one draws up a table with all the combinations of the entries of order. It is noticed that the binary number formed by the state of the entries satasheet selection B and A gives the decimal index of the exit concerned.

One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. 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.

Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: So I will accept it. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure Thanks for simplifying the answer. 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 The expressions and lead us to the logic diagram of figure 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.


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

The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. Information, present on the input, is acicular towards the exit selected by the state datasbeet the entries of order.

Use of a decoder out of demultiplexer. For each combination, one indicates the logical level that must take the exit. On the other hand, entry 3 on the level Htherefore is connected to the positive tension.

The exit S with for the equation: 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.

Click here for the following lesson or in the synopsis envisaged to this end.

Your explanation resolved my confusion.