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What are active high and active low?

Updated: 8/21/2019
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10y ago

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This is two different ways voltage in a digital circuit can represent the "1" or "true" state:

  • active high the higher (more positive) voltagerepresents the "1" or "true" state
  • active low the lower (more negative) voltagerepresents the "1" or "true" state

That's all there is to it.

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10y ago
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Q: What are active high and active low?
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Does active transport go high to low or low to high?

Well it depends most of the time it goes from low to high.


What are the differences between active low and active high SR flip flop?

Hello The difference between an active low and an active high SR flip-flop is that with the active low SR flip-flop, the system is activated when the inputs to system are zeros while with the active high SR flip-flop, the system is activated when the inputs to the system are ones.


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What is meant by the terms 'active high input' and 'active low input'?

The term "active low" means that the input on an IC requires a logic low for it to be activated, i.e a low voltage (of course the voltage range is dependent on the technology, TTL, CMOS etc) Active high is the opposite... the input requires a logic high for it to be activated. A simple example to illustrate, an 8bit counter can count UP/DOWN this functionality is controlled with only one pin, an active high on that pin to count up or low to count down.


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