Tool/software:
I have a design below, I am using this to shutdown any ICs that are using +5V in the event of an undervoltage condition. I am specifically using a TPS3840PH45, so the expected behavior is for the RESET to output a HIGH signal during active events when the voltage drops below 4.5V until it comes back above 4.7V.
On startup, with my entire system connected, I will sometimes see that the TPS3840 RESET line is held high despite the inputs being valid:
Vdd = 5.26
nMR = 5.26
With these conditions, the RESET line should be inactive (LOW) but instead it is outputting a constant 5.26V. This is happening on multiple units. Please advise if my design is incorrect, and ideally why this unexpected behavior might be occurring
**For reference, the 5V_Supervisor line is the output of my regulator and it is only fed into this power supply and the source of the PMOS. the +5V net is power delivered to the rest of the board. This is then passed onto another board via ribbon where I have the same circuit for +3.3V. If I power on this board without the ribbon attached (or attach while already powered) it does not have this issue.
