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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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. Figure 43 illustrates how one passes from a decoder to a demultiplexer. The two groupings and D give us the following equation of S1: Let us examine simplest of the demultiplexers, that with 2 ways.
We will see that the same function can be obtained with a single multiplexer at sixteen entries.
For example, entry 2 must be carried on the level Ltherefore connected to the mass. Use of a decoder out of demultiplexer. We know that the majority of the decoders have their active exits at state 0 and their entry of active validation to state 0.
How to make datasheeh site?
Information, present on the input, is acicular towards the exit daasheet by the state of the entries of order. 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 datasgeetforce the exit of the multiplexer corresponding to state 0 independently of the state of the other entries. The circuit which results from it is deferred on figure The stitching and the logic diagram of this integrated circuit are given on figure 32, while figure 33 gives its dxtasheet table.
Dynamic page of welcome. The not selected exits position with state 1. The example which follows will clarify the procedure. On the other hand, entry 3 on the level Htherefore is connected to the positive tension. Let us carry the entry of validation to state 0: The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure 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.
To find the equation simplest of S1let us draw the picture of Karnaugh figure Electronic forum and Poem. For each combination, one indicates the logical level that must take the exit.
If integrated logical doors are used, one obtains the circuit represented on figure In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. It is noticed that the binary number formed by the state of the entries of selection B and Datashee gives the decimal index of the exit concerned. For each combination of the entries of order, one defers in the column of the exit the state that this one must take.
To determine how to connect the 74513 inputs, it is enough to follow the described procedure and to build a table with sixteen lines like that of figure The integrated circuit 74LS contains two demultiplexers with 4 ways.
This one indeed requires at least three integrated circuits: Now let us carry the entry of validation to state 1: In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder. Datashest forum and Infos. Static page of welcome.
The exit S with for the equation: The next theory will treat memories.
To contact the author. The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table. The data present in D is acicular towards S0 or Datasyeet depending on the state of the entry of order A.