MAX821U中文资料4引脚、微处理器电压监测器，引脚可设置上电复位超时周期数据手册ADI规格书

描述 Description

The MAX821/MAX822 microprocessor (µP) supervisory circuits monitor power supplies in µP and digital systems. They provide excellent circuit reliability and low cost by eliminating external components and adjustments when used with 5V-powered or 3V-powered circuits. The MAX821/MAX822 also provide a power-on reset timeout delay that is pin selectable to 1ms (max), 20ms (min), or 100ms (min).
These devices perform a single function: they assert a reset signal whenever the VCC supply voltage falls below a preset threshold, and they keep reset asserted for the pin-selected reset timeout delay after VCC has risen above the reset threshold. The only difference between the two devices is that the MAX821 has an active-low RESET output (which is guaranteed to be in the correct state for VCC down to 1V), while the MAX822 has an active-high RESET output. The reset comparator is designed to ignore fast transients on VCC. Reset thresholds suitable for operation with a variety of supply voltages are available.
Low supply current makes the MAX821/MAX822 ideal for use in portable equipment. These devices come in a 4-pin SOT143 package.

特性 Features

• Pin-Selectable, Precision Power-On Reset Delay: 1ms (max), 20ms (min), or 100ms (min)
• Precision Monitoring of +3V to +5V Power-Supply Voltages
• 2.5µA Supply Current
• Guaranteed Over Temperature (-40°C to +125°C)
• Guaranteed Active-Low RESET Valid to VCC = 1V (MAX821)
• Power-Supply Transient Immunity
• No External Components
• SOT143 Package

应用 Application

• 条码扫描仪
• 计算机：台式机、工作站和服务器
• 控制器
• 精确的µP与µC电源监控
• 智能仪表
• 便携式电池供电设备

简介

MAX821U属于集成电路（IC）的监控器。由制造生产的MAX821U监控器PMIC 监控器用于监视和/或控制电路中的电压轨，能够连接微控制器以维持一定的功率限值。监控器类型包括电池备用电路、监控器、多电压监控器、电源监控器、稳压器/监控器、复位计时器、定序器、简单复位/上电复位、智能开/关控制器、系统管理器、电压检测器和看门狗电路。