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TL F –1. Order Number DMQB FMQB DMJ. DMW or DMN. See NS Package Number J16A N16E or W16A. Function Table. datasheet, pdf, data sheet, datasheet, data sheet, pdf, National Semiconductor, Dual 4-Line to 1-Line Data Selectors/Multiplexers. The LSTTL/MSI SN54/74LS is a very high speed Dual 4-Input. Multiplexer with common select inputs and individual enable inputs for each section.

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(PDF) 74153 Datasheet download

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. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. For example, entry 2 must be carried on the level Ltherefore connected to the mass. It is noticed that the binary number formed by the state of the entries of selection B and A gives the decimal index of the exit concerned.

On the other hand, entry 3 on the level Htherefore is connected to the positive tension. 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.

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

National Semiconductor

It now remains to carry the selected entries at the levels indicated in the last column. If integrated logical doors are used, one obtains the circuit represented on figure The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth datashete.


The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. Dynamic page of welcome. The next theory will treat memories. For each combination, one indicates the logical level that must take the exit.

One does not find a demultiplexer dstasheet 2 ways integrated. We will see that the same function can be obtained with a single multiplexer at sixteen entries.

Multiplexers CI , The Demultiplexers 74LS

To contact the author. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure Electronic forum and Infos.

Let us examine simplest of the demultiplexers, that with 2 ways. Electronic forum and Poem. This one indeed requires at least three integrated circuits: How to make a site? The not selected exits position with state 1. Figure 43 illustrates how one passes from a decoder to a demultiplexer. Use of a decoder out of demultiplexer. Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: 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.

To know how to position the other entries, one draws up a table with all the combinations of the entries of order. 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. 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 exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers.


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. Forms maths Geometry Physics 1.

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 In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. If one has the integrated circuitone can carry out the circuit of figure The exit S with for the equation: The integrated circuit 74LS contains two demultiplexers with 4 ways.

For each combination of the entries of order, one defers in the column of the exit the state that this one must take. Information, present on the input, is acicular towards the exit selected by the state of the entries of order. Click here for the following lesson or in the synopsis envisaged to this end. The advantage of the multiplexer compared to the network of doors is obvious: The two groupings and D give us the following equation of S1: The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure To find the equation simplest of S1let us draw the picture of Karnaugh figure Static page of welcome.

This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.