LTC2903-1

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 (ThinSOT^TM) Package


Pinout




Specifications

V1, V2 ......................................................  0.3V to 6.5V
V3 .................................................   2.7V or (V_CC + 0.3V)
V4 (LTC2903-A1, LTC2903-B1) ................  0.3V to 6.5V
V4 (LTC2903-C1) ....................................   6.5V to 0.3V
,RST ........................................................   0.3V to 6.5V
Operating Temperature Range
    LTC2903C-X1 .........................................0°C to 70°C
    LTC2903I-X1 .....................................40°C to 85°C
Storage Temperature Range ..............65°C to 150°C
Lead Temperature (Soldering, 10 sec) .................300°C


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.

Internal supply voltage (V_CC) is generated from the greater voltage on the V1, V2 inputs. The ,RST output is guaranteed to sink at least 5µA (VOL = 0.15V) for V1, V2 or V3 down to 0.5V and will typically conduct current down to 0V. Quiescent current is 20µA typical, making the LTC2903-1 ideal for power conscious systems. The LTC2903-1 is available in a 6-lead low profile (1mm) SOT-23 package.