DATASHEET 74154 PDF

You can upvote more than one answer. Since the ouputs are active low, NAND gates do the job. 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. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

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You can upvote more than one answer. Since the ouputs are active low, NAND gates do the job. 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.

By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. Inputs were pulled high by default, and only pulled low when necessary, to save power. The active-low enable inputs allow cascading of demultiplexers over many bits. WhatRoughBeast 49k 2 28 Email Required, but never shown. 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.

Will someone please explain the purpose of inverting the outputs 0 through 15 as well as the use the NAND gates here? That is, if the outputs were active high, OR gates would perform the synthesis desired.

Download the datasheet below for a more comprehensive summary. Each of the 16 outputs can be connected through a resistor and datasheeh through an LED to serve as a simple 16 LED controller. Post as a guest Name. Sign up using Facebook. First, the inversion of the outputs simply means that the output is active low. Datasheet, PDF — Alldatasheet And this carried through to the way the logic was used, and designed with.

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.

My first question is more important The LED can be chosen at random by the status of the 4 line selector inputs. Home Questions Tags Users Unanswered. The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input low. 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 outputs.

These demultiplexers are ideally suited for implementing high-performance memory decoders. 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? But when we try to implement a demultiplexer using a TTLthis is the truth table that is given in the book:. Is the hardware implementation circuit different than the one explained in theory? Sign datashee using Email and Password.

High speed signals were usually active low, for much the same reason. This is the image of a 1 to datasheeet demux. I understand how it works.

As for the NAND gates, there is a function being implemented in which the gates are there to realize it. TOP Related Articles.

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DATASHEET OF IC 74154 PDF

The demultiplexing function is performed by using the 4 input lines to address the output line, passing data from one of the strobe inputs with the other strobe input low. Sign up using Email and Password. This carried through to the input current requirements: Sign up using Facebook. Is the hardware implementation circuit different than the one explained in theory? This all has to do with the actual ic design.

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High to Low Level Output. Each or these 4-line-toline decoders utilizes TTL circuit. High Level Output Current. V CC e Max. Post as a guest Name. First, the inversion of the outputs simply means that the output is active low.

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