The Maxim MAX703EPA is a Battery Backup Circuit — a dedicated MPU supervisor IC that monitors a single voltage rail and asserts a reset signal when the supply drops below a precision threshold. Its primary job is to hold a microprocessor in reset during power-up, brown-out, or momentary sag, and to switch in a backup battery when the main rail collapses below the threshold. This is the supervisor that keeps volatile memory alive and the system state intact across power interruptions. The reset output is Active Low and push-pull (totem pole), so it drives the reset input of most MCUs and MPUs directly without an external pull-up resistor. The voltage threshold is 4.65 V. It monitors one voltage and triggers when the rail falls to 4.65 V or below.
The 4.65 V threshold is the decision point for the supervisor. The 140 ms minimum reset timeout is the period the part holds the reset line low after the supply rises above the threshold. But it cannot be wire-ORed with another open-drain reset source — if your design has multiple reset drivers (watchdog, manual reset button), an open-drain output with a shared pull-up is the usual topology.
Note that the RoHS compliance status is listed as non-compliant. If your assembly house requires RoHS-compliant material, this part will not pass incoming inspection.