I have a circuit with a NE555DR timer that generates a pulse. The reset is held low and lifted when a voltage of 5 - 24V is applied to P0-3.
A PNP transistor MMBT5401 that pulls pin 4 to ground when inactive.
The Simulation is correct for the voltage at pin 4, this is 0.68V on the PCB. The problem that I have is that the DR555 Ti Timer has a low pin tolerance of 0.3V. the 0.68V is not low enough to reset the timer on the PCB.
The current on Pin 4 is 0.5A, I have not been able to get the voltage lower than 0.3V.
How do I get the voltage <0.3V on pin #4 of the NE555DR timer for it to be inactive?
I found this question, however, it did not address the voltage tolerance on the reset pin.