Active Low/High Outputs of 4-16 Line Demux

  • Thread starter ravenprp
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In summary, an active low/high output in a 4-16 line demux refers to the logic level of the output signal, with an active low output having a logic level of 0 and an active high output having a logic level of 1. A 4-16 line demux works by using AND and NOT gates to direct a single input to one of 16 possible outputs based on its binary value. The advantages of using a 4-16 line demux with active low/high outputs include easy interfacing with other digital circuits and clear distinction between logic states. However, a 4-16 line demux cannot be used with analog signals and can be expanded by cascading multiple demuxes together.
  • #1
ravenprp
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Hi,

if i have an active low IC, a 0 is needed to enable the chip.

lets say i have a 4 to 16 line demultiplexer... if the hex is 3, i will get an output of a 0 because A3A2A1A0 = 0011. now, the rest of the outputs will be "1". if I wanted to construct some more logic after that, a "1" is still considered a higih and a "0" is still considered a low right?
 
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  • #2
Yes. High is still high, and low is still low. It's the True and False aspect of the logic that changes for active low versus active high.
 
  • #3


Yes, that is correct. In a 4 to 16 line demultiplexer, the active low IC requires a 0 to enable the chip. The outputs will be 1 for all the other combinations of A3A2A1A0, except for A3A2A1A0 = 0011, which will output a 0. In terms of constructing additional logic, a 1 is still considered a high and a 0 is still considered a low. This is because the active low/high outputs refer to the voltage levels, not the logical values. So, a 1 will still be a high voltage and a 0 will still be a low voltage, regardless of the logical value associated with it.
 

1. What is an active low/high output in a 4-16 line demux?

An active low/high output in a 4-16 line demux refers to the logic level of the output signal. An active low output has a logic level of 0 or low, while an active high output has a logic level of 1 or high. This means that the output signal will either be a low or high voltage depending on its active state.

2. How does a 4-16 line demux work?

A 4-16 line demux, short for demultiplexer, is a digital logic circuit that takes in a single input and directs it to one of 16 possible outputs based on the binary value of the input. It does this by using a combination of AND and NOT gates to decode the input signal and activate the corresponding output line.

3. What are the advantages of using a 4-16 line demux with active low/high outputs?

One advantage of using a 4-16 line demux with active low/high outputs is that it allows for easy interfacing with other digital circuits. Active low/high outputs are commonly used in digital systems, making the demux compatible with a variety of devices. Additionally, the active low/high outputs provide a clear distinction between logic states, making it easier to interpret and use the output signals.

4. Can a 4-16 line demux be used for both analog and digital signals?

No, a 4-16 line demux is designed to work specifically with digital signals. It uses binary logic to decode the input signal and direct it to the appropriate output line. Analog signals, which have a continuous range of values, cannot be accurately decoded by a demux.

5. How can I expand the number of outputs on a 4-16 line demux?

You can expand the number of outputs on a 4-16 line demux by cascading multiple demuxes together. This involves using the output of one demux as the input for another, effectively creating a larger demux with more output lines. For example, cascading two 4-16 line demuxes would result in a 8-256 line demux.

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