https://www.analog.com/jp/resources/design-notes/adjustable-hysteresis-in-microprocessorreset-ics.html
Adjustable Hysteresis in Microprocessor-Reset ICs | Analog Devices
This (very) simple circuit lets you adjust the otherwise fixed hysteresis found in most of the available 3-pin microprocessor
adjustable hysteresismicroprocessorreseticsanalog