N Datasheet, N PDF, N Data sheet, N manual, N pdf, N, datenblatt, Electronics N, alldatasheet, free, datasheet. Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise . 3. Ordering information. 74HC; 74HCT 4-to line decoder/ demultiplexer. Rev. 7 — 29 February Product data sheet. Table 1. Ordering .

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Paul Johnosn August 1, at 5: The person who took time to answer the question will appreciate that.

I graduated in and have tried my best to share my electrical knowledge and experience with viewers and readers from all over the world.

Will someone please explain the purpose of inverting the outputs 0 through 15 as well as the use the NAND gates here? WhatRoughBeast 49k 2 28 This allows more flexibility in the logic functions available. Email Required, but never shown. Here is the truth table from the datasheet: Any pointers would be helpful.

I was wondering if you can control multiple 74hc with the 74lsn. If you have any questions about a specific segment, datashee them in a comment below or on the forums.

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Use 4 Arduino pins for 16 outputs! The account aided me a acceptable deal. I am a new user so I didn’t know I had that power. According to the internal logic diagram on the datasheet, the G inputs dqtasheet connected to a two-input AND gate with inverting inputs, whose output feeds one input of all the NAND gates that produce the outputs. All the other ouputs stay high. Serial to Parallel Demultiplexer. Notify me of new posts by email. That is, for an input ofthe 0 output is selected, and it is driven low.

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What you need to pay attention to as well is the truth table. Home Questions Tags Users Unanswered. June 30th, 0 Comments. So is it possible that both enables are hooked to a 2-input OR gate; 74154b is just datxsheet use of the extra pins to make 24?

EEEnthusiast May 12, at 8: My first question is more important Since the ouputs are active low, NAND gates do the job. I will go through the code section by section. I had been a little bit familiar of this your broadcast offered bright clear idea Diego recently posted… Diego.

Circuits Intégrés Logiques TTL

This site uses Akismet to reduce spam. 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.

First, the inversion of the outputs simply means that the output is active 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.

If you are looking for a different way to drive your outputs, or want an easier solution to your output needs, this tutorial is definitely for you. It requires a 32 LED chase array. 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. As for the NAND gates, there is a function being implemented in which the gates are there to realize it.

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And why are there 2 of them, you ask? If you have any questions about the implementation, feel free to post vatasheet below or on the forums. You can find me on my personal site or LinkedIn! 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 the checkbox you clicked to accept this question. 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.

The active-low enable inputs allow cascading of demultiplexers over many bits. Leave A Comment Cancel reply Comment. This means that you may not need the four push buttons if you only want to work with the Dataheet.