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 exit S with for the equation: For each combination of the entries lc order, one defers in the column of the exit the state that this one must take. Dynamic page of welcome. For example, entry 2 must be carried on the level Ltherefore connected to the mass. Click here for the following lesson or in the synopsis envisaged datasheey this end. The two groupings and D give us the following equation of S1: The expressions and lead us to the logic diagram of figure The advantage of the multiplexer daasheet to the network of doors is obvious: In addition to the commutation of several logical signals, the multiplexer can be used to replace a network.
Use of a decoder out of demultiplexer. Since all the combinations of the entries A, B, 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.
Now let us carry the entry of validation to state 1: 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 datxsheet.
dstasheet This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order. The example which follows will clarify the procedure. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. For each combination, one indicates the logical level that must take the exit.
The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. Forms maths Geometry Physics 1.
Electronic forum and Poem. It now remains to carry the selected entries at the levels indicated in the last column.
In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers.
The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure 33 gives its truth datasneet. Return to the synopsis.
One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. On the other hand, entry 3 on the level Htherefore is connected to the positive tension.
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.
If integrated logical doors are used, one obtains the circuit represented on figure High of page Preceding page Following page.
The not selected exits position with state 1. 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 has four switches being able to be connected either to the supply voltage, or with the mass and one wants to ratasheet so at least two switches are closed again on the positive tension of food. To contact the author. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. The next theory will treat memories.
Datasheet, PDF – Alldatasheet
This one indeed requires at least three integrated circuits: The integrated circuit 74LS contains two demultiplexers with 4 ways. We will see that the same function can be obtained with a single multiplexer at sixteen entries.
One does not find a demultiplexer with 2 ways integrated. Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: 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: Static page of welcome.
To know how to position the other entries, one draws up a table with all the combinations of the entries of order. To find the equation simplest of S1let us draw the picture of Karnaugh figure A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.
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