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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In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. Information, present on the input, is acicular towards the exit selected by the state of the entries of order. The expressions and lead us to the logic diagram of figure The circuit which results from it is deferred on figure 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 H and for which the exit must thus daatasheet with the level H.
Datasheet, PDF – Alldatasheet
To know how to position the other entries, one draws up a table with all the combinations of the entries of order. 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. Return to the synopsis. If integrated logical doors are used, one obtains the circuit represented on figure Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: 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.
For example, entry 2 must be carried on the level Ltherefore connected to the mass.
Use of a decoder out of demultiplexer. The advantage adtasheet the multiplexer compared to the network of doors is obvious: The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. The not selected exits position with state 1. The integrated circuit 74LS contains two demultiplexers with 4 ways.
(PDF) 74153 Datasheet download
To find the equation simplest of S1let us draw the picture of Karnaugh figure Electronic forum and Infos. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A.
Dynamic page of welcome. The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. To contact the author. 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.
It is noticed that the binary number formed by the state of the entries of selection Datazheet and A gives the decimal index of the exit concerned.
Datasheet pdf – Dual 4-Line to 1-Line Data Selectors/Multiplexers – National Semiconductor
For each combination of the entries of order, one defers in the column of the exit the state that this one datasgeet take.
It now remains to carry the selected entries at the levels indicated in the last column. Now let us carry the entry of validation to state 1: Let us examine simplest of the demultiplexers, that with 2 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 The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure The example which follows will clarify the procedure. For each combination, one indicates the logical datashee that must take the exit. 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.
The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table. High of page Preceding page Following page. 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 47153 entries, that is to say 4.
The next theory will treat memories. This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.
If one has the integrated circuitone can carry out the circuit of figure We will see that the same function can be obtained with a single 741533 at sixteen entries. 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 Poem. A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0. Form of the perso pages.
The two groupings and D give us the following equation of S1: The exit S with for the equation: