555 timer in Bistable Mode

The bistable 555 timer is also referred to as a flip-flop circuit. In this scenario, a flip-flop circuit controls the output of electrical current from the output pin by switching back and forth between two stable states. Bistallable mode does not require a resistor and capacitor to control the timing of the circuit, unlike the monostable mode and astable mode. In actuality, this circuit has no time. The trigger pin and reset pin independently control the only two stable states (on and off).

Single Pole Double Throw Switch attached to the trigger pin and reset pin and a LED is used to show the 555 timer's bistable mode. When the trigger pin is grounded, current allows move from Vcc to ground, lowering the voltage at the trigger pin. Then the output is activated and the LED turns on when the trigger pin is at a low voltage. Until the voltage at the threshold pin rises above 2/3 Vcc, the output remains active. The output never goes off because the threshold pin in this circuit is linked to ground, which prevents it from ever reaching 2/3 Vcc.

Now if the reset pin is grounded, the voltage at the reset pin now flows to ground, making the pin low. The output is turned off when the reset pin becomes low.