74139 DATASHEET PDF

Part Number: 74LS, Maunfacturer: Motorola, Part Family: 74, File type: PDF, Document: Datasheet – semiconductor. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may. r/Demultip lex e r. 74LS / 74LSSMD / 74LS Decoder/Demultiplexer. General Description. These Schottky-clamped circuits are designed to be used.

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The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure 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. 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 two groupings and D give us the following equation of S1: On the other hand, entry 3 on the level Htherefore is connected to the positive tension.

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.

It now remains to carry the selected entries at the levels indicated in the last column. Forms maths Geometry Physics 1. Thanks datasheet the answer. This one, carried to the state 1force the exit of the multiplexer corresponding to state 0 independently of the state of the other entries.

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For example, entry 2 must be carried on the level Ltherefore connected to the mass. Let us carry the entry of validation to state 0: The integrated circuit contains two multiplexers with 4 ways at entries of selection A and B communes.

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Use of a decoder out of demultiplexer. In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. 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 not selected exits position with state 1. The diagram symbolic system and the mechanical equivalent of a demultiplexer with 2 ways are presented at figure Thanks for simplifying the answer.

Figure 43 illustrates how one passes from a decoder to a demultiplexer. What, exactly, do you think the function of pins 1 and 15 are? If one has the integrated circuitone can carry out the circuit of figure 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.

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The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.