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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

4引脚SOT复位IC,可选择复位超时延迟周期

产品详情

主要特征

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 15ms to 85ms
85ms to 300ms
<1ms
Adjustable
Watchdog Feature No Watchdog
ICC (µA) (max) 7
Package/Pins SOT23/4
Budgetary
Price (See Notes)
1.46
缩小

简化框图

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参量

Parametric specs for Supervisors (1 Monitored Voltage)
Reset Thresh. (V) 2.5 to 3.3
3.3 to 5.5
Reset Thresh. Accur. (%) (@ +25°C) 1.5
Reset Out Active Low
Push-Pull
tRESET (min) 15ms to 85ms
85ms to 300ms
<1ms
Adjustable
Watchdog Feature No Watchdog
ICC (µA) (max) 7
Package/Pins SOT23/4
Budgetary
Price (See Notes)
1.46

主要特征

  • 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/用途

  • 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

描述

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.

简化框图

MAX821、MAX821L、MAX821M、MAX821P、MAX821R、MAX821S、MAX821T、MAX821U、MAX822、MAX822L、MAX822M、MAX822R、MAX822S、MAX822T:典型工作电路 MAX821、MAX821L、MAX821M、MAX821P、MAX821R、MAX821S、MAX821T、MAX821U、MAX822、MAX822L、MAX822M、MAX822R、MAX822S、MAX822T:典型工作电路 Zoom icon

Technical Docs

支持和培训

在Maxim的知识库中搜索技术问题的答案

过滤搜索

Maxim的专业工程师团队也会为您解答相应的技术问题,请访问Maxim的 支持中心