General Description

The AS1925/AS1926 microprocessor supervisory circuits were designed to assert a single reset if the monitored supply voltage drops below its reset threshold or if the manual reset is activated. The reset remains asserted for a fixed timeout delay after VCC has risen above the reset threshold and the manual reset is deas serted.

Their small size, excellent circuit reliability, and low supply current (3.5μA) make the AS1925/AS1926 a very low cost solution by eliminating external components and adjustments when used with low-voltage (+0.9 to +1.5V) systems.

Key Features

Factory-Trimmed Reset Thresholds for Monitoring Supplies from 0.9 to 1.5V

Low Power Consumption: 3.5μA

Reset Threshold Accuracy Over Temperature: ±2.5

Four Timeout Periods: 1.5ms, 30ms, 210ms, and 1.68s

Three Reset Output Types:

- Active-Low Push/Pull

- Active-High Push/Pull

- Active Low Open-Drain

Guaranteed Reset Valid to VCC = 0.55V (Active Low)

Manual Reset Input

Immune to Fast VCC Transients

5-pin SOT23 Package

Applications

The device is ideal for portable and battery-powered systems, embedded controllers, intelligent instruments, automotive systems, telecommunications equipment, networking equipment, computer workstations and serv

ers, critical CPU monitoring applications, and any low voltage application.