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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Wouter van Ooijen The not selected exits position with state 1.

Multiplexers CI , The Demultiplexers 74LS

If integrated logical doors are used, one obtains the circuit represented on figure The exit S with for the equation: Thanks for the answer. Dynamic page of welcome. The combinative circuit which fulfills the function of the demultiplexer with 2 ways must thus correspond to the truth table of figure By using our site, you acknowledge that you have read and understand our Cookie DafasheetPrivacy Policyand our Terms of Service. Sign up using Email and Password. 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.

Here is the link to take a look at datasheet.

To find the equation simplest of S1let us draw the picture of Karnaugh figure Black Mamba 2. The advantage of the multiplexer compared to datasbeet network of doors is obvious: This one indeed requires at least three integrated circuits: To know how to position the other entries, one draws up a table with all the combinations of the entries of order.


Your explanation resolved my confusion. For example, entry 2 must be carried on the level Ltherefore connected to the mass.

74139 Datasheet PDF

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. The outputs are active low, hence the outputs that are not addressed are high. The entries of ordering datashete the multiplexer become the entries of the network which one wants to carry out. Click here for the following lesson or in the synopsis envisaged to this end.

We know that the majority of the decoders have 741339 active exits at state 0 and their entry of active validation to state 0. One realizes that it is necessary to employ several types of doors, of the doors OR with daatsheet entriesa door OR at 2 entries and a door AND 4 entries. There is no select lines. In the logic diagram of the 74LS, you have exactly that. One subjects the entry corresponding to the combination of the entries of order at the level wished at exit.

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

In fact the image you show from the datasheet explains this in the “Pin Names” section just below the connection diagram. For each combination of the entries of order, one defers in the column of the exit the state that this one must take. Sign datasjeet or log in Sign up using Google. What, exactly, do you think the function of pins 1 and 15 are?


– Dual 2-to-4 line decoder/demultiplexer – ChipDB

The example which follows will clarify the procedure. Sign up using Facebook. So, I compared it to Demux’s Enable input. The E enable line can be used as active low input. In this chapter, we will examine the demultiplexers which are circuits whose function is opposite among that of the multiplexers. 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.

I just better understood the concept from you than from Tom’s answer. Use of a decoder out of demultiplexer. Forms maths Geometry Physics 1. Static page of welcome. So, I was confused.

Now let us carry the entry of validation to state 1: Figure 43 illustrates how one passes from a decoder to datashet demultiplexer.

The expressions and lead us to daasheet logic diagram of figure In addition to the commutation of several logical signals, the multiplexer can be used to replace a network. To contact the author.