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MAX690R：3.0V/3.3V微处理器监控电路

业内首款电池备份监控电路，用于3.3V/3.0V系统

These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components. These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows: Part Active-Low Reset Active-High Reset Watchdog Input Manual Reset Input Backup-Battery Switch Power-Fail Threshold Accuracy Power-Fail Comparator Reset Window MAX690 √   √   √ ±4% √ ±75mV MAX704 √     √ √ ±4% √ ±75mV MAX802 √   √   √ ±2% √ ±2% MAX804   √ √   √ ±2% √ ±2% MAX805   √ √   √ ±4% √ ±75mV MAX806 √     √ √ ±2% √ ±2%

关键特性 Active-Low RESET and RESET Outputs Manual Reset Input Precision Supply-Voltage Monitor 200ms Reset Time Delay Watchdog Timer (1.6sec timeout) Battery-Backup Power Switching-Battery Can Exceed VCC in Normal Operation 40µA VCC Supply Current 1µA Battery Supply Current Voltage Monitor for Power-Fail or Low-Battery Warning Guaranteed Active-Low RESET Assertion to VCC = 1V 8-Pin DIP and SO Packages

MAX690R、MAX690S、MAX690T、MAX704R、MAX704S、MAX704T、MAX802、MAX802R、MAX802S、MAX802T、MAX804、MAX804R、MAX804S、MAX804T、MAX805、MAX805R、MAX805S、MAX805T、MAX806R、MAX806S、MAX806T：典型工作电路 应用 电池供电计算机/控制器 精确的µP监控 嵌入式控制器 智能仪表 便携式设备

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