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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How to make a site? 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 datasheet.

Use of a decoder out of demultiplexer.

Click here for the following lesson or in the synopsis envisaged to this end. The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.

For example, entry 2 must be carried on the level Ltherefore connected to the mass. The expressions and lead us to the logic diagram of figure 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.

The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension.

Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: To find the equation simplest of S1let us draw the picture of Karnaugh figure The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure The two groupings and D give us the following equation of S1: The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A.


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 Let us carry the entry of validation to state 0: The advantage of the multiplexer compared to the network of doors is obvious: If one has the integrated circuitone can carry out the circuit of figure According to what was known as before, the four switches are connected to datasheey four entries of order D, C, B, A of the multiplexer.

Figure 43 datashwet how one passes from a decoder to a demultiplexer. Electronic forum and Poem.

The circuit which results from it is deferred on figure The integrated circuit 74LS contains two demultiplexers with 4 ways. A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. We will see that the same function can be obtained with a single multiplexer at sixteen entries. This one indeed requires at least three integrated circuits: Information, present on the input, is acicular towards the exit selected by the state of the entries of order.

(PDF) 74153 Datasheet download

Forms maths Geometry Physics 1. The not selected exits position with state 1. Static page of welcome. To know how to position the other entries, one draws up a 74513 with all the combinations of the entries of order. If integrated logical doors are used, one obtains the circuit represented on figure This i 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 multiplexers.

Return to the synopsis. 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 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.

Let us examine simplest of the demultiplexers, that with 2 ways.

Datasheet(PDF) – National Semiconductor (TI)

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. Form of the perso pages. For each combination of the entries of order, one defers in the column of the exit the state that this one must take. To contact the author. This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries.

In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.

One does not find a demultiplexer with 2 ways integrated.

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