DESCRIPTION

The LTC®2902 is a programmable supply monitor for systems with up to four supply voltages. One of 16 preset or adjustable voltage monitor combinations can be selected using an external resistor divider connected to the program pin. The preset voltage thresholds are digitally programmable to 5, 7.5, 10 or 12.5 below the nominal operating voltage, and are accurate to 1.5 over temperature. All four voltage comparator outputs are connected to separate pins for individual supply monitoring.

FEATURES

■ Simultaneously Monitors Four Supplies

■ 16 User Selectable Combinations of 5V, 3.3V, 3V,

2.5V, 1.8V, 1.5V and/or ±Adjustable Voltage

Thresholds

■ Guaranteed Threshold Accuracy: ±1.5 of Monitored

Voltage Over Temperature

■ Selectable Supply Tolerance: 5, 7.5,

10, 12.5 Below Monitored Voltage

■ Low Supply Current: 43µA Typ

■ Adjustable Reset Time

■ RESET Disable Pin for Margining Applications

■ Open-Drain RST Output (LTC2902-1)

■ Push-Pull RST Output (LTC2902-2)

■ Individual Nondelayed Monitor Outputs for Each Supply

■ Power Supply Glitch Immunity

■ Guaranteed RESET for VCC ≥ 1V

APPLICATIONS

■ Desktop and Notebook Computers

■ Multivoltage Systems

■ Telecom Equipment

■ Portable Battery-Powered Equipment

■ Network Servers