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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(PDF) 74154 Datasheet download

These demultiplexers are ideally suited dafasheet implementing high-performance memory decoders. Post Your Answer Discard By datashfet “Post Datawheet 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.

WhatRoughBeast 49k 2 28 The person who took time to answer the question iv appreciate that. And that’s what is going on with the But when we try to implement a demultiplexer using a TTLthis datassheet the truth table that is given in the book:. That is, for an input ofthe 0 output is selected, and it is driven low. Understand, this is a typical example of application, not it’s sole purpose. Inputs were pulled high by default, and only pulled low when necessary, to save power.

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. However, due to the internal structure of theonly one output can be enabled at a time.

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National Semiconductor

Email Required, but never shown. Home Questions Tags Users Unanswered. Sign up using Facebook. So they are inverted a explained in the theory. 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.

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Sign up using Email and Password. According to the internal logic diagram 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.

Many TTL parts and older memory chips have active low enable inputs, so the dtaasheet low outputs of this part can be connected directly to those inputs. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

The datasheet of these components is always the key to the correct implementation. Why is the output in the truth table inverted in a ic used as a demux? Common collector, with the signal connected to the emitter, which remains at 0.

Datasheet(PDF) – National Semiconductor (TI)

When either strobe input is high, all outputs are high. 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.

So theory will cover only the theory which explains datasgeet basic functionality of the working of a demultiplexor. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties. And why are there 2 of them, you ask? All the other ouputs stay high.

Home Questions Tags Users Unanswered. This is the image of a 1 to 16 demux. But when we try datazheet implement a demultiplexer using a TTLthis is the truth table that is given in the book: 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? It is counterintuitive yes, but it is a well-established convention that the sort datashret devices that this part will be controlling will have active-low enable inputs.

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The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from datasjeet of the strobe inputs with the other strobe input low. And this carried through to the way the logic was used, and designed with. 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.

Each of the 16 outputs can be connected through a resistor and then through an LED to serve as a simple 16 LED controller. This allows more flexibility in the logic functions available. I am a new user so I didn’t know I had that power. You can upvote more than one answer. By ci our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

Sign up or log in Sign up using Google. I understand how it works. I have a doubt in the demultiplexer section. Sign up or log in Sign up using Google. This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical eatasheet. Post as a guest Name. 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.