G680/G681 Global Mixed-mode Technology Microprocessor Reset IC Features General Description ±2.5% Voltage Threshold Accuracy Independently Adjustable High- and LowVoltage Thresholds 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%. 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 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. Applications Computers Controllers Intelligent Instruments Critical µP and µC Power Monitoring Portable / Battery-Powered Equipment Automotive 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. Ordering Information ORDER NUMBER (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 RESET -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 VCC G680/G681 HTH 1 5 Vcc RPULL-UP* LTH GND LTH 2 G680/G681 4 3 VCC VCC HTH RESET(RESET) RESET (RESET) GND µP RESET INPUT GND SOT-23-5 *G681 ONLY () is for G680H TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 2.0 Nov 23, 2012 1