140ms reset timeout — why that window
A 140ms minimum reset timeout is a common industry standard for supervisory ICs. It provides enough hold-off time for most microcontrollers and DSPs to complete their internal power-on reset sequence, oscillator startup, and initial register configuration before the supervisor releases the reset line. The 140ms figure is the minimum over temperature and supply; the actual timeout is typically longer, ensuring margin. If your processor requires a shorter or longer reset pulse, the MAX690RCSA+ is fixed — no external capacitor adjustment — so verify the timing against your MCU's datasheet requirement before committing the BOM line.
Active production, no LTB risk
It is ROHS3 compliant (lead-free) and remains a current-production part from Analog Devices.