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Notice: The information in this document is subject to change without notice

Low Power, 5V/3.3V, µP Reset, Active LOW, Open-Drain Output

ASM1233D-L/D/M

rev 1.3

March 2005

Application Information

Operation - Power Monitor

The ASM1233D-L/1233D/1233M detects out-of-tolerance

power supply conditions. It resets a processor during power-

up, power-down and generates a reset to the system

processor when the monitored power supply voltage is below

detected, the RESET signal is asserted. On power-up,

RESET is kept active (LOW) for approximately 350ms after

the power supply voltage has reached the selected tolerance.

This allows the power supply and microprocessor to stabilize

before RESET is released.

RESET

Figure 1: Timing Diagram: Power-Up

RESET

Figure 2: Timing Diagram: Power-Down