產(chǎn)品詳情

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 hysteresis. 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.

The G681L has an open-drain output stage, while the G680 have push-pull outputs. The G681L’s open-drain RESET output requires a pull-up resistor that can be connected to a voltage higher than VCC. The G680L have an active-low RESET output, while the G680H has an active-high RESET output. The reset comparator is designed to ignore fast transients on threshold input.

The IC’s power supply is separate from the detector inputs, allowing the G680/G681 to be powered from a down-stream supply. Low supply current (4μA, typical) makes the G680/G681 ideal for use in portable equipment. The G680/G681 are available in SOT-23-5 packages.

Features

■ ±2.5% 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

■ SOT-23-5 Packages

Applications

■ Computers

■ Controllers

■ Intelligent Instruments

■ Critical μP and μC Power Monitoring

■ Portable / Battery-Powered Equipment

■ Automotive