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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The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.

The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure Dynamic page of welcome. We will see that the same function can be obtained with a single multiplexer at sixteen entries. For each combination, one indicates the logical level that must take the exit. For each combination of the entries of order, one defers in the column of the exit datasheeet state that this one must take.

National Semiconductor

In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. The exit S with for the equation: Now let us carry the entry of validation to state 1: The example which follows will clarify the procedure.

To know how to position the other entries, one draws up a table with all the combinations of the entries of order. Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: Return to the synopsis. In short, the logical data present on the entry of validation is i towards the exit selected by the entries of the decoder.

(PDF) 74153 Datasheet download

One does not find a demultiplexer with 2 ways integrated. 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.


Let us examine simplest of the demultiplexers, that with 2 ways. Information, present on the input, is acicular towards the exit selected by the state of the entries of order.

Electronic forum and Infos. Let us carry the entry of validation to state 0: The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure datasheer gives its truth table. One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. 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. For example, entry 2 must be carried on the level Ltherefore connected to the mass.

The exit of the circuit is brought to the level H when at dahasheet two of the reversers are commutated on the positive tension. The circuit which results from it is deferred on figure Forms maths Geometry Physics 1. High of page Preceding page Following page. The not selected exits position with state 1. The data present in D is acicular datasheet S0 or S1 dataaheet on the state of the entry of order A.

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. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0. Click here for the following lesson or in the synopsis envisaged to this end.


To contact the author. 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.

Datasheeet circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line.

The next theory will treat memories. 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. The advantage of the multiplexer compared to the network of doors is obvious: The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.

Form of the perso pages.

Multiplexers CI , The Demultiplexers 74LS

This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the 741533.

It now remains to carry the selected entries at the levels indicated in the last column. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must datxsheet correspond to the truth table of figure How to make a site? If one has the integrated circuitone can carry out the circuit of figure