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Technical content

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 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 V CC supply voltage declines below the low-voltage threshold, keeping it asserted for at least 140ms after V CC 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 V CC. The G680L have an active-low RESET output, while the G680H has an active-high RESET output. The reset com- parator is designed to ignore fast transients on thresh- old 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 (4 µA, typical) makes the G680/G681 ideal for use in portable equipment. The G680/G681 are available in SOT -23-5 packages.

Ordering Information

(Pb free/Green) MARKING OUTPUT TYPE TEMP. RANGE PACKAGE G680LT1Uf 680Ax Push-pull RESET -40°C ~ +105°C SOT-23-5 G680HT1Uf 680Bx Push-pull R ESET -40 °C ~ +105°C SOT-23-5 G681LT1Uf 681Ax Open-Drain RESET -40°C ~ +105°C SOT-23-5 Note: T1: SOT-23-5 Pin Configuration Typical Application Circuit G680/G681 Vcc RESET(RESET) SOT-23-5 1HTH GND LTH () is for G680H RESET INPUT GND µP VCC RESET (RESET) GND G680/G681 VCC RPULL-UP VCC *G681 ONLY LTH HTH G680/G681 Vcc RESET(RESET) SOT-23-5 1HTH GND LTH () is for G680H RESET INPUT GND µP VCC RESET (RESET) GND G680/G681 VCC RPULL-UP VCC *G681 ONLY LTH HTH