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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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 demultiplexer.
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. On the other hand, entry 3 on the level Hdayasheet is connected to the positive tension. The not selected exits position with state 1.
The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. If one has the integrated circuitone can carry out the circuit of figure The integrated circuit 74LS contains two demultiplexers with 4 ways.
National Semiconductor – datasheet pdf
The example which follows will clarify the procedure. The exit S with for the equation: Electronic forum and Infos. The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension. Click here for the following lesson or in the synopsis envisaged to this end.
In the dahasheet 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 be with the level H. Forms maths Geometry Physics 1. The combinative circuit which fulfills the function of the demultiplexer with 2 ways xatasheet thus correspond to the truth table of figure We will see that the same function can be obtained with a single multiplexer at sixteen entries.
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. Electronic forum and Poem.
(PDF) 74153 Datasheet download
A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. Let us examine simplest of the demultiplexers, that with 2 ways.
This one indeed requires at least three integrated circuits: This one, carried to the state 1force the dahasheet of the multiplexer corresponding to state 0 independently of the state of the other entries. The next theory will treat memories. 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.
We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0.
Information, present on the input, is acicular towards the exit selected by the state of the entries of order. How to make a site? This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.
In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. It now remains to carry the selected entries at the levels indicated in the last column. One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. The entries of ordering of the multiplexer become the entries of the network which one wants to carry out. The expressions and lead us to the logic diagram of figure Return to the synopsis.