555/556 Bistable (flip-flop) - a memory circuit
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| 555 bistable circuit |
The circuit is called a
bistable because it is stable in
two states: output high and output low.
It is also known as a 'flip-flop'.
It has two inputs:
- Trigger (555 pin 2) makes the output high.
Trigger is 'active low', it functions when < 1/3 Vs.
- Reset (555 pin 4) makes the output low.
Reset is 'active low', it resets when < 0.7V.
The power-on reset, power-on trigger and edge-triggering circuits can all be used as described
above for the
monostable.
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