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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One subjects the entry corresponding to the combination of the entries of order datasheft the level wished at exit. In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder.
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. Forms maths Geometry Physics 1. If one has the integrated circuitone can carry out the circuit of figure 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.
National Semiconductor – datasheet pdf
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 combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure The circuit which results from it is deferred on figure The expressions and lead us to the logic diagram of figure This one indeed requires at least three integrated circuits: Let us datsheet simplest of the demultiplexers, that with 2 ways.
In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. Dynamic page of welcome.
We will see that the same function can be obtained with a single multiplexer at sixteen entries. Now let us carry the entry of validation to state 1: Electronic forum and Infos.
The two groupings and D give us the following equation of S1: The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. The exit S with for the equation: 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 The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure High of page Preceding page Following page.
For each combination, one indicates the logical level that must take the exit. To find the equation simplest of S1let us draw the picture of Karnaugh figure Let us carry the entry of validation to state 0: 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.
Multiplexers CI , The Demultiplexers 74LS
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. 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.
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.
In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. ratasheet
(PDF) 74153 Datasheet download
Return to the synopsis. On the other hand, entry 3 on the level Htherefore is connected to the positive tension.
The not selected exits position with state 1. To contact the author. One does not find a demultiplexer with 2 ways integrated. The example which follows will clarify the procedure. Figure 43 illustrates xatasheet one passes from a decoder to a demultiplexer.