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A 555 timer can be wired to output the opposite digital high or low voltage compared to the digital high or low voltage of an input signal. There is also a middle input voltage that is the hysteresis region where the output will stay in either state.
- High is considered as being close to the positive supply voltage.
- Low is considered as being close to the negative supply voltage.
- Hysteresis for a standard 555 timer circuit is when the input is between 1/3 and 2/3 of the supply voltage.
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