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. Ordering information. 74HC; 74HCT Dual 2-to-4 line decoder/ demultiplexer. Rev. 4 — 11 December Product data sheet. Table 1. Ordering.
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High of page Preceding page Following page. In this chapter, we will examine the demultiplexers which 74139 datasheet circuits whose function is opposite among that of the multiplexers. The exit S with for the equation: Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: Information, present on the input, is acicular towards the exit selected by the state of the entries of order. One has four switches 74139 datasheet able to be connected either to the supply 74139 datasheet, or with the mass and one wants to know so at least two switches are closed again on the positive tension of food.
To find the equation simplest of S1let us datsaheet the picture of Karnaugh figure For each combination of the entries of order, 74139 datasheet defers in the column of the exit the state that this one must take. Let us examine simplest of the demultiplexers, that with 2 ways. 74139 datasheet
Multiplexers CI , The Demultiplexers 74LS
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. 74139 datasheet addition to the commutation of several logical signals, the multiplexer can be used to replace a network. To know how to position the other entries, one draws up 74139 datasheet table with all the combinations of the entries of order.
Now let us carry the entry of validation to state 1: Click here for the following lesson or in the synopsis envisaged to this end. It is noticed that the binary number formed by 74139 datasheet state of the entries of selection B and A gives the decimal index of the exit concerned. One 74139 datasheet that it 74139 datasheet 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.
Static page of welcome. Return to the synopsis. 74139 datasheet next theory will treat memories. The stitching dztasheet the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table. This one, 74139 datasheet to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries. We know that the majority of the decoders have their active exits at state dataxheet and their entry of active validation to state 0.
This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order. Forms maths Geometry Physics 1.
The two groupings and D give us the following equation of S1: To contact the 74139 datasheet. In short, the logical data present on the entry 74139 datasheet validation is acicular towards the exit selected by the entries of the decoder.
The not selected exits position with state 1. 74139 datasheet diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure One subjects the entry corresponding to the combination of the entries of order at the level wished at exit.
This one indeed requires at least three integrated datasheeet The example which follows will clarify the procedure. If one has the integrated circuitone can carry out the circuit of figure 74139 datasheet Let us carry the entry of validation to state 0: The expressions datasehet lead us to the logic 74139 datasheet of figure It now remains to carry the selected entries at the 74139 datasheet indicated in the last column.
For each combination, one indicates the logical level that must take the exit. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure 33 gives its truth table.
Electronic forum and Infos. How to make a site? The integrated circuit 74LS contains two demultiplexers with 4 ways. The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension.
74139 datasheet of a decoder out of demultiplexer. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. To determine how to connect the sixteen inputs, it is enough to follow the described procedure and to build a table datasyeet sixteen lines like that of figure Figure 43 illustrates how one passes from a decoder to a demultiplexer. The data present 74139 datasheet D is acicular towards S0 or S1 depending on the state of the entry of order A.
74139 datasheet integrated logical doors are used, one obtains the circuit represented on figure We will see 7439 the same function can 74139 datasheet obtained with a single multiplexer at sixteen entries. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes.