MAX821|MAX821L|MAX821R|MAX821S|MAX821T - 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

MAX821|MAX821L|MAX821R|MAX821S|MAX821T - 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 - 监控电路、电压监测、排序 - 4引脚SOT复位IC，可选择复位超时延迟周期 - 美信半导体

产品概述

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.

关键特性

以下关键特性由Maxim美信半导体提供：

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

热门应用

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

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