Bistable mode 555 timer means that the output stays in it’s current state of either high or low, until forced to change to the other state. After changing states, it stays in it’s new state until forced to change again. 2 stable states = bistable.
- High: Typically close to the positive supply voltage.
- Low: Typically close to the negative supply voltage. This is usually the zero volt reference point ground.
- Set: If the output is low, and you give a low signal to trigger pin (2), then the output will go high and stay there. That is unless the reset pin (4) is low (see below)
- Reset: If the output is high and you give a low signal to reset pin (4), then the output will go low and stay there.
- Reset pin (4) always overpowers trigger pin (2). So, if you give a low signal to both of them at the same time, then the output will be low.
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- Information on this site is not guaranteed to be accurate. Always consult the manufacturer info/datasheet of parts you use. Research the proper safety precautions for everything you do.