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