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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Will someone please explain the purpose of inverting the outputs 0 through 15 as well as the use the NAND gates here? 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. Post as a guest Name.

Understand, this is a typical example of application, dataasheet it’s sole purpose.

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Datasheet(PDF) – National Semiconductor (TI)

The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs 7454 the other strobe input low. These demultiplexers are ideally suited for implementing high-performance memory decoders. WhatRoughBeast 49k 2 28 I am a new user so I didn’t know I had that power.

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National Semiconductor

All inputs are buffered and input clamping diodes are provided to minimize transmission-line effects and thereby simplify system design. That is, for an input ofthe 0 output is selected, and it is driven low.

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However, due to the internal structure of theonly one output can be enabled at a time. 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? Sign up darasheet Email and Password.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. The LED can be chosen catasheet random by the status of the 4 line selector inputs.

National Semiconductor – datasheet pdf

Sign up using Facebook. The active-low enable inputs allow cascading of demultiplexers over many bits. All the other ouputs stay high.

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.

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My first question is more important That is, if the outputs were active high, OR gates would perform the synthesis desired. First, the inversion of the outputs simply means that the output is active low. This chip is often used in demultiplexing applications, such as digital clocks, LED matrices, and other graphical outputs. The active-low output is just how the design for that specific decoder was carried out – there is also active-high varieties.

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. 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. Each of the 16 outputs can be connected through a resistor and then through an LED to serve as a simple 16 LED controller.

Email Required, but never shown. When either strobe input is high, all outputs are high.

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