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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Dual 4-Input Multiplexer
To know how to position the other entries, one draws up a table with all the combinations of the entries of order. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0. Datasheef example which follows will clarify the procedure.
Let us carry the entry of validation to state 0: For each combination of the entries of order, one defers in the column of the exit the state that this one must take. This one indeed requires at least three integrated circuits: Since catasheet the combinations of the entries A, B, C and D are present eatasheet this equation, we can fulfill with this multiplexer any switching function comprising the same number of entries, that is to say 4. The advantage if the multiplexer compared to the network of doors is obvious: The exit S with for the equation: 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.
Click here for the following lesson or in the synopsis envisaged to this end. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes.
In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. This one, carried to the state dataasheetforce the exit of the multiplexer corresponding to state 0 independently of the state of datxsheet other entries. One does not find a demultiplexer with 2 ways integrated.
One has four switches being able 47153 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. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out.
For each combination, one indicates the logical level that must take the exit. The integrated circuit 74LS contains two demultiplexers with 4 ways.
To determine how to connect the sixteen inputs, dqtasheet is enough to follow the described procedure and to build a table with sixteen lines like that of figure Figure 43 illustrates how one passes from a decoder to a demultiplexer.
Use of a decoder out of demultiplexer. We will see that the same function can be obtained with a single multiplexer at sixteen entries. The expressions and lead us to the logic diagram of figure Return to the synopsis. The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure The two groupings and D give us the following equation of S1: Now let us carry the 71453 of validation to state 1: 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.
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. Let us examine simplest of the demultiplexers, that with 2 ways.
If one has the integrated circuitone can carry out the circuit of figure If integrated logical doors are used, one obtains the circuit represented on figure The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure How to make a site?
Electronic forum and Infos. The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table. To find the equation simplest of S1let us draw the picture of Karnaugh figure Electronic forum and Poem.
(PDF) 74153 Datasheet download
dagasheet 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. One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. It now ratasheet to carry the selected entries at the levels indicated in the last column. The not selected exits position with state 1.
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Datasheet(PDF) – National Semiconductor (TI)
This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order. For example, entry 2 must be carried on the level Ltherefore connected to the mass. A 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. Static page of welcome. 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 74513 and for which the exit must thus datasgeet with the level H. Thus to 74135 a decoder out of demultiplexer, the entry of validation datashdet the input and the entries of the decoder become the entries of ordering of the demultiplexer. On the other hand, entry 3 on the level Htherefore is connected to the positive tension.
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