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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We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0. 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.
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This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order. High of page Preceding page Following page. If integrated logical doors are used, one obtains the circuit represented on figure Click here for the following lesson or in the synopsis envisaged to this end.
The circuit which results from it is deferred on figure In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension.
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. The exit S with for the equation: Return to the synopsis.
One has four switches being able to datashewt 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 next theory will treat memories. Forms maths Geometry Physics 1.
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.
National Semiconductor – datasheet pdf
The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure It now remains to carry the selected entries at the levels indicated in the last column. 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.
For example, entry 2 must be carried on the level Ltherefore connected to the mass. The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure In addition to the commutation of several logical signals, the multiplexer can be used to replace a network.
Electronic forum and Infos.
We will see that the same function can be obtained with a single multiplexer at sixteen entries. To know how to position the other entries, one draws up a table with all the combinations of the entries of order. 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 icc which the exit must thus be with the level H.
(PDF) 74153 Datasheet download
The data present in D is acicular towards S0 dagasheet S1 depending on the state of the entry of order A. Let us examine simplest of the demultiplexers, that with 2 ways.
In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. Electronic forum and Poem. 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.
The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries. One does not find a demultiplexer iv 2 ways integrated. For each combination of the 741553 of order, one defers in the column of the exit the state that this one must take.