General Description

The ASM1834 supervisors simultaneously monitor both 3.3V and 5V power sources and generate reset signals when either supply is out of tolerance. When an out-of-tolerance condition is detected, the output-reset signal of the affected supply becomes active and resets the system microprocessor/microcontroller. On power-up and after the supply voltage returns to an in-tolerance condition, the reset signal remains active for approximately 350ms. This allows the power supply and system microprocessor to stabilize.

Key Features

? Monitors 5V and 3.3V supplies simultaneously

? 5V and 3.3V power-on reset

? 350ms reset time

? Debounced pushbutton reset input

? Push-pull CMOS output

? ASM1834, ASM1834D

? Eliminates external pull-up resistors

? Active LOW (ASM1834), HIGH (ASM1834D)

? Open Drain Output

? ASM1834A

? Active LOW

? Selectable 5V and 3.3V trip point tolerance

? Internal power drawn from highest input voltage, 5V or 3.3V

? Precision temperature-compensated voltage reference and comparator

? Low cost surface mount SO, compact MicroSO and DIP packages.

? Wide operating temperature, -40°C to +85°C

Applications

? Microprocessors

? PDAs, Hand-held PCs

? Embedded Controllers

? Telecommunication Systems

? Power Supplies

? Wireless / Cellular Systems

? Networking Hardware