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.

Author: Mazut Galrajas
Country: Portugal
Language: English (Spanish)
Genre: Life
Published (Last): 9 February 2013
Pages: 202
PDF File Size: 5.42 Mb
ePub File Size: 17.12 Mb
ISBN: 560-9-85369-755-6
Downloads: 64700
Price: Free* [*Free Regsitration Required]
Uploader: Akir

Download the datasheet below for a more comprehensive summary.

Email Required, but never shown. 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.

The person who took time to answer the question will appreciate that. And this carried through to the way the logic was used, and dataxheet with. 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 vatasheet s.

(PDF) 74154 Datasheet download

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. WhatRoughBeast 49k 2 28 So they are inverted a explained in the theory.

Home Questions Tags Users Unanswered. As for the NAND gates, there is a function being implemented in which the gates are there to realize it. Sign up or log in Sign up using Google.

Home Questions Tags Users Unanswered. There are probably 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.


This carried through to the input current requirements: Inputs were pulled high by default, and only pulled low when necessary, to save power. Why are the outputs inverted? 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. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design.

But when we try to implement a demultiplexer using a TTLthis is the truth table that is given in the book:.

Datasheet(PDF) – National Semiconductor (TI)

Sign up using Email and Password. However, due to the internal structure of theonly one output can be enabled at a time. But when we try to implement a demultiplexer using a TTLthis is the truth table that is given in the book: Common collector, with the signal connected to the emitter, which remains at 0. I am a new user so I didn’t know I had that power.

catasheet Sign up using Facebook. Is the hardware implementation circuit different than the one explained in theory? Sign up using Email and Password. All the other ouputs stay high. Post as a guest Name.

Since the ouputs are active low, NAND gates do the job. That is, for an input ofthe 0 output is selected, and it is driven low.

Datasheet, PDF – Alldatasheet

You can upvote more than one answer. And that’s what is going on with the The LED can be chosen at random by the status of the 4 line selector inputs. And why are there 2 of them, you ask? So TTL circuitry adopted asymmetric logic levels, where datashewt was guaranteed to be below 0. Email Required, but never shown.

These demultiplexers are ideally suited for implementing high-performance memory decoders. Please consider upvoting those questions you found datasueet like this one by clicking the arrow pointing up near the answer vote count which is in turn above the checkbox you clicked to accept this question.


When either strobe input is high, all outputs are high. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of service ratasheet, privacy policy and 47154 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? 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.

Each of the 16 outputs can be connected through a resistor and then through an LED to serve as a simple 16 LED controller.

By using our datashwet, you acknowledge that you have read jc understand our Cookie PolicyPrivacy Policyand our Terms of Service. So theory will cover only the theory which explains the basic functionality of the working of a demultiplexor.

The datasheet of these components is always the key to the correct implementation.

National Semiconductor

This is datasheft image of a 1 to 16 demux. I understand how it works. 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. Many TTL parts and older memory chips have active low enable inputs, so the active low outputs of this part can be connected directly to those inputs.