IC 74154 DATASHEET PDF

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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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Inputs were pulled high by default, and only pulled low when necessary, to save power.

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 datahseet significant bits, with one ouput going to each of the other 16 s. All the other ouputs stay high.

Rather than providing only a single enable, both pins are used. 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.

High speed signals were usually active low, for much the same reason. Understand, this is a typical example of application, not it’s sole purpose. This is the image of a 1 to 16 demux. So theory will uc only the theory which explains the basic functionality of the working of datasbeet demultiplexor. And why are there 2 of them, you ask?

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First, the inversion of the outputs simply means that the output is active low. Post as a guest Name.

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

Home Questions Tags Users Unanswered. This carried through to the input current requirements: I understand how it works.

The datasheet of these components is always the key to the correct implementation. I have a doubt in the demultiplexer datwsheet. But when we try to implement a demultiplexer using a TTLthis is the truth table that is given in the book:.

National Semiconductor

Sign up using Email and Password. This allows more flexibility in the logic functions available. 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 catasheet high. And this carried through to the way the logic was used, and designed with.

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4 to 16 decoder logic diagram – Electrical Engineering Stack Exchange

Sign up using Email and Password. Post as a guest Name. The LED can be chosen at random by the status of the 4 line selector inputs.

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Datasheet, PDF – Alldatasheet

So you can use a 47 kilohm resistor to pull up drops 1. The demultiplexing function is performed by using lc 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input low. 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, adtasheet low.

This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. The active-low enable inputs allow cascading of demultiplexers over many bits.