DESCRIPTION

The LTC®2903-1 monitors up to four supply voltages. The common reset output remains low until all four inputs have been in compliance for 200ms. Voltage thresholds maintain ±1.5% accuracy over temperature (with respect to the monitored voltage). The LTC2903-1 features an open-drain RST output with a weak internal pullup.

FEATURES

■ Ultralow Voltage Reset: VCC = 0.5V Guaranteed

■ Monitor Four Inputs Simultaneously

3.3V, 2.5V, 1.8V, ADJ (LTC2903-A1)

5V, 3.3V, 2.5V, 1.8V (LTC2903-B1)

5V, 3.3V, 1.8V, –5.2V (LTC2903-C1)

■ Guaranteed Threshold Accuracy: ±1.5% of Monitored Voltage over Temperature

■ 10% Undervoltage Monitoring

■ Low Supply Current: 20µA Typical

■ 200ms Reset Time Delay

■ Active Low Open-Drain RST Output

■ Power Supply Glitch Immunity

■ Low Profile (1mm) SOT-23 (ThinSOTTM) Package

APPLICATIONS

■ Multivoltage Systems

■ Optical Networking Systems

■ Cell Phone Base Stations

■ Network Servers