General Description

The AS1901/2/3 family is an ultra low-power supervisory circuit device.

The device can be used to monitor the supply voltage of digital systems and microprocessors and initiate a reset when the voltage goes below a predefined threshold.

The duration of the reset is 5/20/100/500ms (typ.) after the supply voltage has risen above the threshold. The AS1901/2/3 exhibit excellent reliability and can reduce application costs by eliminating all external components.

Key Features

■ Low 230nA (typ) Supply Current

■ Precision Monitoring of 2.5-, 3-, and 3.3V-Power Supplies

■ Supply Voltage Range: 1.0 to 3.6V

■ Reset Threshold Range: 2.2 to 3.1V

■ Available in 3 Versions:

- AS1901 Push Pull RESETN

- AS1902 Push Pull RESET

- AS1903 Open Drain RESETN

■ 4 Time-Out Periods Ranging from 5 to 500ms

■ Detection Voltage Accuracy: ±1.5

■ Temperature Range: -40 to +85°C

■ Package: SOT23-3

Applications

The devices are ideal for computers, intelligent instruments, controllers, critical microprocessor and microcontroller, power monitoring and portable/batterypowered equipment.