General Description

The G680/G681 are microprocessor (µP) supervisory circuits used to monitor the power supplies in µP and digital systems. High- and Low- voltage thresholds can be adjusted independently, allowing for wide hystere sis. Voltage detection thresholds are accurate to 2. These circuits perform a single function: they assert a reset signal whenever the VCC supply voltage declines below the low-voltage threshold, keeping it asserted for at least 140ms after VCC has risen above the high-voltage threshold.

Features

High ±2 Voltage Threshold Accuracy

Independently Adjustable High- and Low Voltage Thresholds

Fully Specified Over Temperature

Available in Three Output Configurations

Push-Pull RESET Output (G680L)

Push-Pull RESET Output (G680H)

Open-Drain RESET Output (G681L)

„140ms min Power-On Reset Pulse Width

4µA Supply Current

Power Supply Transient Immunity

5-Pin SOT23-5 Packages

Applications

Computers

Controllers

Intelligent Instruments

Critical µP and µC Power Monitoring

Portable / Battery-Powered Equipment

Automotive