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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Sign up using Email and Password. For example, if the target application requires 16 7-segment LED displays, but your microcontroller only has 4 lines to select which datassheet is active, this chip 74LS would provide a very effective method of essentially multiplying you selecting lines by a 4 times.

And that’s what is going on with the And this carried through to the way the logic was used, and designed with. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued datashfet of the website is subject to these policies.

It is counterintuitive yes, but it is a well-established convention that the sort of devices that this part will be controlling will have active-low enable inputs. I have a doubt in the demultiplexer section. Sign up or log in Sign up using Google. Since the ouputs are active low, NAND gates do the job.

Many TTL parts and older memory chips have active low enable inputs, datasheer the active low outputs of this part can be connected directly to those inputs. This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. You can upvote more than one answer. Please consider upvoting those questions you found useful like this one by clicking the arrow pointing up near the answer vote count which is in turn above datsheet checkbox you clicked to accept this question.

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These demultiplexers are ideally suited for implementing high-performance memory decoders. So theory will cover only the theory which explains the basic functionality of the working of a demultiplexor.

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, G1 and G2, are low. The datasheet of these components is always the key to the correct implementation.

If you want to know exactly what is going on then draw out the truth table, but it is unlikely their function will make much sense to you.

Common collector, with the signal connected to the emitter, which remains at 0. Post Your Answer Discard By clicking “Post 7154 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.

Why is the output in the truth table inverted in a ic used as a demux?

National Semiconductor

I understand how it works. Email Required, but never shown. First, the inversion of the outputs simply means that the output is active low.

So you can use a 47 kilohm resistor to pull up drops 1. 744154 are the outputs inverted? By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. WhatRoughBeast 49k 2 28 The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties.

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4 Line to 16 Line Demultiplexer / Decoder

Download the datasheet below for a more comprehensive summary. Will someone please explain the purpose of inverting the outputs 0 through 15 as well as the use the NAND gates here? Sign up or log in Sign up using Google. Post as a guest Name.

All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. Home Questions Tags Users Unanswered. However, due to the internal structure of theonly one output datasheeg be enabled at a time.

My first question is more important 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.

Post Your Answer Discard 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.

The LED can be chosen at random by the status of the 4 line selector inputs. If you have some experience using BJTs you 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 high.

This is the image of a 1 to 16 demux. So TTL circuitry adopted asymmetric logic levels, where ‘0’ was guaranteed to be below 0.