Linear Technology LTC2909CTS8-3.3#TRPBF

Description
The LTC2909 is a dual input monitor designed for various system monitoring applications. It features polarity selection and a buffered reference output, allowing it to monitor positive and negative supplies for undervoltage (UV) and overvoltage (OV) conditions. The two inputs have a nominal 0.5V threshold with tight 1.5% threshold accuracy over the entire operating temperature range. Glitch filtering ensures reliable reset operation without false triggering. Additionally, a third fixed-threshold UVLO monitor on the part's Vcc (also 1.5% accuracy) is available for standard logic supplies. The common reset output has a timeout that can use a preset 200ms, be set by an external capacitor, or be disabled. A three-state input pin sets the input polarity of each adjustable input without requiring any external components.

Features
Two low voltage adjustable inputs (0.5V)
Pin selectable input polarity allows negative and OV monitoring
Guaranteed threshold accuracy: ±1.5%
6.5V shunt regulator for high voltage operation
Low 50µA quiescent current
Buffered 1V reference for negative supply offset
Input glitch rejection
Adjustable reset timeout period
Selectable internal timeout saves components
Open-drain RST output
Accurate UVLO for 2.5V, 3.3V, 5V systems
Ultralow voltage reset: Vcc = 0.5V guaranteed
Space saving 8-lead TSOT-23 and 3mm x 2mm DFN packages

Applications
Desktop and notebook computers
Handheld devices
Network servers
Core, I/O monitor
Automotive
Precision triple/dual input UV, OV, and negative voltage monitor