Maxim Integrated Voltage Supervisor 8-Pin SOIC, DS1834AS+

Monitors both 3.3V and 5V power supplies
3.3V and 5V power-on and power transient resets
Provides pushbutton switch for manual reset control
Active low push-pull outputs (DS1834)
Active low open-drain outputs (DS1834A)
Active high push-pull outputs (DS1834D)
Draws internal power from the higher of the two sources
Uses precision temperature-compensated voltage reference and sensor
Maintains active high reset for 350ms after power return
Internal 5kΩ pull-up resistor
Operating ranges:
5V with 5% or 10% tolerance
3.3V with 10% or 20% tolerance
-40°C to +85°C