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MAX820L, MAX820M, MAX820R, MAX820S, MAX820T

微处理器及非易失存储器监控电路

微处理器和非易失存储器监控电路

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) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Cap Adjustable
Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 150
Package/Pins SOIC (N)/16
Budgetary
Price (See Notes)
5.43
缩小

简化框图

Technical Docs

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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) 2.5
Reset Out Active High
Active Low
Push-Pull
tRESET (min) 85ms to 300ms
Watchdog Feature Cap Adjustable
Input (WDI)
Input/Output (WDI/WDO)
Watchdog Timeout 1s to 2s
<1s
>2s
Adjustable
Supervisor Features Manual Reset
Power Fail Comparator/Low Battery Detect
ICC (µA) (max) 150
Package/Pins SOIC (N)/16
Budgetary
Price (See Notes)
5.43

主要特征

  • Manual-Reset Input
  • 200ms Power OK/Reset Time Delay
  • Independent Watchdog Timer-Preset or Adjustable
  • On-Board Gating of Chip-Enable Signals
  • Memory Write-Cycle Completion
  • 10ns (max) Chip-Enable Gate Propagation Delay
  • Voltage Monitor for Overvoltage Warning
  • ±2% Reset and Low-Line Threshold Accuracy (MAX820, external programming mode)

应用/用途

  • 计算机:台式机、工作站和服务器
  • 控制器
  • 精确的µP监控
  • 智能仪表

描述

The MAX792/MAX820 microprocessor (µP) supervisory circuits provide the most functions for power-supply and watchdog monitoring in systems without battery backup. Built-in features include the following:
  • µP reset: Assertion of RESET and active-low RESET outputs during power-up, power-down, and brownout conditions. Active-low RESET is guaranteed valid for VCC down to 1V.
  • Manual-reset input.
  • Two-stage power-fail warning: A separate low-line comparator compares VCC to a preset threshold 120mV above the reset threshold; the low-line and reset thresholds can be programmed externally.
  • Watchdog fault output: Assertion of active-low WDO if the watchdog input is not toggled within a preset timeout period.
  • Pulsed watchdog output: Advance warning of impending active-low WDO assertion from watchdog timeout that causes hardware shutdown.
  • Write protection of CMOS RAM, EEPROM, or other memory devices.
The MAX792 and MAX820 are identical, except the MAX820 guarantees higher low-line and reset threshold accuracy (±2%).

简化框图

MAX792、MAX792L、MAX792M、MAX792R、MAX792S、MAX792T、MAX820、MAX820L、MAX820M、MAX820R、MAX820S、MAX820T:典型工作电路 MAX792、MAX792L、MAX792M、MAX792R、MAX792S、MAX792T、MAX820、MAX820L、MAX820M、MAX820R、MAX820S、MAX820T: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