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

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

ASM1233A

rev 1.0

November 2003

Application Information

Operation - Power Monitor

The ASM1233A 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 the reset

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

active (LOW) for approximatley 350ms after the power supply

voltage has reached the selected tolerance. This allows the

power supply and microprocessor to stablize before RESET

is released.

RESET

Figure 1: Timing Diagram: Power-Up

RESET

Figure 2: Timing Diagram: Power-Down