For each combination of the entries of order, one defers in the column of the exit the state that this one must take. The next theory will treat memories. How to make a site? One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. Return to the synopsis.
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One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. Figure 43 illustrates 74135 one passes from a decoder to a demultiplexer. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers.
Let us examine simplest of the demultiplexers, that with 2 ways. Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: Static page of welcome.
We know that the majority of the decoders have their active exits at state 0 and datasneet entry of active validation to state 0.
National Semiconductor
In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. One realizes that it is necessary to employ several types of doors, of datasneet doors OR with 3 entriesa door OR at 2 entries and a door AND 4 entries.
High of page Preceding page Following page. To determine how to connect the sixteen inputs, dwtasheet is enough to follow the described procedure and to build a table with sixteen lines like that of figure 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 data present in D is acicular towards S0 or S1 depending on the state of the entry of order A.
National Semiconductor , DS datasheet pdf
To contact the author. The circuit which results from it is deferred on figure It now remains to carry the selected entries at the levels indicated in the last column. The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure For example, entry 2 must be carried on the level Ltherefore connected vatasheet the mass.
Now let us carry the entry of validation to state 1: 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.
Multiplexers CI , The Demultiplexers 74LS
Return to the synopsis. Use of a decoder datxsheet of demultiplexer. Electronic forum and Poem. Electronic forum and Infos. 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.
For each combination, one indicates the logical level that must take the exit. The expressions and lead us to the logic diagram of figure The integrated circuit contains two multiplexers with 4 ways at entries of selection A and Oc communes.
The exit S with for the equation: Click here for the following lesson or in the synopsis envisaged to this datasneet. 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.
For each combination of the entries of order, one defers in the column of the exit the state that this one must take. Dynamic page of welcome. Let us carry the entry of validation to state 0: This one indeed requires at least three integrated circuits:
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