74154 DATASHEET PDF

The NTE is a monolithic 4-line-toline decoder in a Lead DIP type The NTE is fully compatible for use with most other TTL and DTL circuits. MOS technology. A binary code applied to the four inputs (A to D) provides a low level at the selected one of sixteen outputs excluding the other fifteen outputs. SNN .. of significant portions of TI information in TI data books or data sheets is permissible only if reproduction is without alteration.

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My first question is more important Home Questions Tags Users Unanswered.

However, due to the internal structure of theonly one output can be enabled at a time. For example, if the target application requires 16 7-segment LED displays, but your microcontroller only has 4 lines to select which display is active, this chip 74LS would provide a very effective method of essentially multiplying you selecting lines by a 4 times.

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. Understand, this is a typical example of application, not it’s sole purpose.

National Semiconductor – datasheet pdf

As for the NAND gates, there is a function being implemented in which the gates are there to realize it. 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. 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 satasheet inputs.

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I am a new user so I didn’t know I had that power. All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. The demultiplexing function is performed daasheet using the 4 input lines to address the output line, passing data from one of the strobe inputs with the dagasheet strobe input low.

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. WhatRoughBeast 49k 2 28 This allows more flexibility datasyeet the logic functions available.

Email Required, but never shown. First, the inversion of the outputs simply means that the output is active low. All the other ouputs stay high. When either strobe input is high, all outputs are high. And why are there 2 of them, you ask? Download the datasheet below for a more dtaasheet summary. These demultiplexers are ideally suited for implementing high-performance memory decoders.

Datasheet(PDF) – National Semiconductor (TI)

That is, if the outputs were active high, OR gates would perform the synthesis desired. The active-low enable inputs allow cascading of demultiplexers over many bits.

Each of the 16 outputs can be connected through a resistor and then through 47154 LED to serve as a simple 16 LED controller. Rather than providing only a single datashfet, both pins are used.

Sign up or log in Sign up using Google. That is, for an input ofthe 0 output is selected, and it is driven low. 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?

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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 datashfet is subject to these policies. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties.

National Semiconductor

Post as a guest Name. 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.

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 datashwet. The person who took time to answer the question will appreciate that. Dataasheet 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.