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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And this carried through to the way the logic was used, and designed with. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design.

4 to 16 decoder logic diagram – Electrical Engineering Stack Exchange

This is the image of a 1 to 16 demux. Post as a guest Name. This all has to do with the actual ic design. So they are inverted a explained in the theory. This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and datashewt graphical outputs. But when we try to implement a demultiplexer using a TTLthis is the truth table that is daasheet in the book:. You can upvote more than one answer.

Sign up using Email and Password. Post as a guest Name. Each or these 4-line-toline decoders utilizes TTL circuitry to decode four binary-coded inputs into one of sixteen mutually datashset outputs when both the strobe inputs, G1 and G2, are low. This allows more flexibility in the logic functions available.


However, due to the internal structure of theonly one output can be enabled at a time. I understand how it works. Email Required, but never shown.

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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. There are probably two enable inputs because datasneet there would be two unused pins on the 24 iic package I don’t recall seeing 22 pin DIP packages.

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?

National Semiconductor

Each of the 16 outputs can be connected through a resistor and then through an LED to serve as a simple 16 LED controller. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties.

First, the inversion of the outputs simply means that the output is active low. When either strobe input is high, all outputs are high. So TTL circuitry adopted asymmetric logic levels, where ‘0’ was guaranteed to be below 0. Home Questions Tags Users Unanswered.


The LED can be chosen at random by the status of the 4 line selector inputs. All the other ouputs stay 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. Common collector, with the signal connected to the emitter, which remains at 0.

Since the ouputs are active low, NAND gates do the job. Sign up using Facebook. I am a new user so I didn’t know I had that power. These demultiplexers are ideally suited for implementing high-performance memory decoders.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. 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.

That is, if the outputs were active high, OR gates would perform the synthesis desired.

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