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Comparator circuits look at 2 separate input voltages applied to 2 separate inputs. The output state (high or low) is determined by which input has a higher voltage.
The output goes high (as close to the supply voltage as the circuit can provide) if the non inverting (+) input voltage is higher than the inverting (-) input voltage.
Output goes low (as close to the negative supply voltage as the circuit can go) when the + input has a lower voltage than the – input.
When it comes to being high or low, the output is always more like the + input compared to the – input.
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