IC 74154 DATASHEET PDF

Integrated Circuit. Transistor Transistor Logic (TTL). 4−Line−to−16−Line Decoder /Demultiplexer. 24−Lead DIP Type Package. Description: The NTE is a. 1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without load. (Refer to Test . datasheet, circuit, data sheet: NSC – 4-Line to Line for Electronic Components and Semiconductors, integrated circuits, diodes, triacs.

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Home Questions Tags Users Unanswered. So they are inverted a explained in the theory. Datawheet is, for an input ofthe 0 output is selected, and it is driven low. This is the image of a 1 to 16 demux. Why is the output in the truth table inverted in a ic used as a demux?

That is, if the outputs were active high, OR gates would perform the synthesis desired. Inputs were pulled high by default, datasueet only pulled low when necessary, to save power. When either strobe input is high, all outputs are high.

(PDF) 74154 Datasheet download

If you have some experience using BJTs dataseet will know that NPN transistors are best used to pull a signal to 0V common emitter, with the output connected to the collector and quite weak at pulling a signal datasgeet. The LED can be chosen at random by the status of the 4 line selector inputs. Is the hardware implementation circuit different than the one explained in theory? So you can use a 47 kilohm resistor to pull up drops 1.

The active-low output is just how the design for that specific decoder was carried out lc there is also active-high varieties. But when we try to datasheft a demultiplexer using a TTLthis is the truth table that is given in the book: First, the inversion of the outputs simply means that the output is active low. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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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. These demultiplexers are ideally suited for implementing high-performance memory decoders.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. As for the NAND gates, there is a function being implemented in which the gates are there iic realize it. For example, if the target application requires 16 7-segment LED displays, but your microcontroller only has 4 lines to select which display is datasheft, this chip 74LS would provide a very effective method of essentially multiplying you selecting lines by a 4 times.

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Common collector, with the signal connected to the emitter, which remains at 0. Email Required, but never shown. Understand, this is a typical example of application, not it’s sole purpose. I understand how it works. The person who took time to answer the question will appreciate that.

Datasheet, PDF – Alldatasheet

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If you wanted to generate a 1 of demultiplexer, you could use 16 s looking at the 4 least significant bits, while a single would look at the 4 most significant bits, with one ouput going to each of the other 16 s.

Download the datasheet below for a more comprehensive summary. There are adtasheet two enable inputs because otherwise there would be two unused pins on the 24 pin package I don’t recall seeing 22 pin DIP packages.

Sign up using Facebook. The datasheet of these components is always the key to the correct implementation. Please consider upvoting those questions you found useful like dahasheet one by clicking the arrow pointing up near the answer vote count which datashete in turn above the checkbox you clicked to accept this question. This allows more flexibility in the logic functions available. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input low.

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Since the ouputs are active low, NAND gates do the job.

National Semiconductor

And this carried through to the way the logic was used, and designed with. However, due to the internal structure of theonly one output can be enabled at a time. So is it possible that both enables are hooked to a 2-input OR gate; this is just making use of the extra pins to make 24? So theory will cover only the theory which explains the basic functionality of the working of a demultiplexor.

I am a new user so I didn’t know I had that power. Post as a guest Name.

4 to 16 decoder logic diagram – Electrical Engineering Stack Exchange

High speed signals were usually active low, for much the same reason. This carried through to the input current requirements: 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. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design.

Sign up using Email and Password. According to the internal logic oc on the datasheet, the G inputs are connected to a two-input AND gate with inverting inputs, whose output feeds one input of all the NAND gates that produce the outputs.

Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually exclusive outputs when both the strobe inputs, Ddatasheet and G2, are low.