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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This 74139 datasheet made possible because the equation of the exit of a 74139 datasheet reveals all the possible combinations of the entries of order. Since all the combinations of the entries A, 74139 datasheet, C and D are present in this equation, we can fulfill with this multiplexer any switching function comprising the same number of entries, that is to say 4.
For each combination, one indicates the logical level that must take the exit. The 74139 datasheet which follows datashet clarify the procedure. The integrated circuit contains two multiplexers with 4 ways at entries of selection 74139 datasheet and B communes. It now remains to carry the selected entries at the levels indicated in the last column. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0.
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 The exit S datashheet for the equation: The next theory will treat memories.
Dynamic page of welcome. One subjects the entry corresponding to 74139 datasheet combination of the entries of order at the level wished at exit.
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. High of page 74139 datasheet page Following page. Click here for the following lesson or in the synopsis envisaged to this end. 74139 datasheet 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.
– Dual 2-to-4 line decoder/demultiplexer – ChipDB
Electronic forum and Poem. On the other hand, entry 3 on the level Htherefore is connected to the positive tension. One does not find a demultiplexer with 2 ways integrated. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure Let us carry the entry of validation to 74139 datasheet 0: To find the equation simplest of S1let us draw the picture of Karnaugh figure It is noticed 74139 datasheet the binary number formed by the state of the entries of selection B and A gives the decimal index of the exit concerned.
Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: The circuit which results from it is deferred on figure Moreover, the use of a multiplexer makes 74139 datasheet possible to pass easily from a switching function to another by changing the level of 74139 datasheet inputs. Return to the synopsis. The 74139 datasheet and the logic diagram of this integrated circuit are given on figure 32, while figure 33 gives 74139 datasheet truth table.
In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A.
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 74139 datasheet and for which the exit must thus be with the level H. The advantage of the multiplexer compared to the network of 74139 datasheet is obvious: Use of a decoder out of demultiplexer.
Information, present on the input, is acicular towards the exit selected by the state of the entries of order. Thus to use a decoder out of demultiplexer, the entry of validation becomes the input and the entries of the decoder 74139 datasheet the entries of ordering of the demultiplexer. Form of the perso pages. This one, carried to the state 1force the exit of 74139 datasheet multiplexer corresponding to state 0 independently of the state 74139 datasheet the other entries.
Let us examine simplest of the demultiplexers, 74139 datasheet with 2 ways. 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. 74139 datasheet 43 illustrates how one passes from a decoder to a demultiplexer.
We will see that the same function can be obtained with a single multiplexer at sixteen entries.