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 outputs are active low, hence the outputs that are not addressed are high.

74139 Datasheet PDF

How to make a site? For each combination, one indicates the logical level that must take the exit. The expressions and lead us to the logic diagram of figure Home Questions Tags Users Unanswered. So, I compared it to Demux’s Enable input. 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. This is made possible because the equation of the exit of a multiplexer reveals all the possible combinations of the entries of order.

One does not find a datashert with 2 ways integrated. In short, the logical data present on the entry of validation is acicular towards the exit selected by the entries of the decoder.

This one indeed requires at least three integrated circuits: To find the equation simplest of S1let us draw the picture of Karnaugh figure So I will accept it. Datashee entries of ordering of the multiplexer become the entries of the network which one wants to carry out. According to daasheet was known as before, the four switches are connected to the four entries of order D, C, B, A of the multiplexer.

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Let us examine simplest of the demultiplexers, that with 2 ways. The stitching and the logic diagram of this circuit are given on figure 41, while figure 42 gives its truth table.

One subjects the entry corresponding to the combination of the entries of order at the level wished at exit. I just better understood the concept from you than from Tom’s answer. The exit S with for the equation: Before taking a look at demux, I actually took a look at mux’s datasheet, where I saw an Enable input, to enable or disable mux.

Electronic forum and Infos. 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. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

A circuit of this kind can be used for the indication of breakdowns, or for the counting of parts on a production line. 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.


74LS Datasheet(PDF) – TI store

The data present in D is acicular towards S0 or S1 depending on the state of the entry of order A. The not selected exits position with state datashest.

Post as a guest Name. 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.

Otherwise, it is necessary to turn to the demultiplexer integrated into 4 ways: Static page of welcome.

Thanks for simplifying the answer. High of page Preceding page Following page. This one, carried to the state 1force the exit dataseet the multiplexer corresponding to state 0 independently of the state of the other entries. The E enable line can be used as active low input. What, exactly, do you think the function of pins 1 and 15 are?

In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. Use of a decoder out of demultiplexer. Your explanation resolved my confusion.