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 circuit which results from it is deferred on figure High of page Preceding page Following page. To know how to position the other entries, one draws up a table with all the combinations of the entries of order.
The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes. Use of a decoder out of demultiplexer. The advantage adtasheet the multiplexer compared to the network of doors is obvious: On the other hand, entry 3 on the level Htherefore is connected to the positive tension. The data present in D is acicular towards S0 or S1 depending on the state of datasgeet entry of order A.
This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries. The expressions and lead us to the logic diagram of figure Iv this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers.
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The exit S with for the equation: 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 each combination of the entries of order, one defers in the column of the exit the state that this one must take. If one has the integrated circuitone can carry out the circuit datashheet figure Otherwise, it is datashewt to turn to the demultiplexer integrated into 4 ways: The exit of the circuit is brought to the level H when at least two of the reversers are commutated on the positive tension.
Datasheet, PDF – Alldatasheet
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. Let us carry the entry of validation to datasbeet 0: For each combination, one indicates the logical level that must take the exit.
In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. 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.
The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure 33 gives its truth table. Now let us carry the entry of validation to state 1: Electronic forum and Poem.
In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. We know that the majority of the decoders have their active exits at state 0 and their entry datawheet active validation to state 0. Information, present on the input, is acicular towards the exit selected by the state of the entries of order.
National Semiconductor – datasheet pdf
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.
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.
This one indeed requires at least three integrated circuits: Static page of welcome. The example which follows will clarify the procedure.
To find the equation simplest of S1let us draw the picture of Karnaugh figure Figure 43 illustrates how one passes from a decoder to a demultiplexer. The not selected exits position with state 1. 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 To contact the author.