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+5V微处理器监控电路

低功耗、小尺寸、微处理器监控电路,带有备份电池切换

产品详情

主要特征

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 3.3 to 5.5
Reset Out Active Low
Push-Pull
ICC (µA) (max) 45
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
3.65
缩小

简化框图

Technical Docs

数据资料 +5V微处理器监控电路 Mar 14, 2006

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参量

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 3.3 to 5.5
Reset Out Active Low
Push-Pull
ICC (µA) (max) 45
Oper. Temp. (°C) -40 to +85
0 to +70
Package/Pins PDIP/8
SOIC (N)/8
UMAX/8
Budgetary
Price (See Notes)
3.65

主要特征

  • Precision Supply-Voltage Monitor:
    • 4.65V (MAX81_L)
    • 4.40V (MAX81_M)
  • 11µA Quiescent Supply Current
  • 200ms Reset Time Delay
  • Watchdog Timer with 1.6sec Timeout (MAX817/MAX818)
  • Battery-Backup Power Switching; Battery Voltage Can Exceed VCC
  • Battery Freshness Seal
  • On-Board, 3ns Gating of Chip-Enable Signals (MAX818)
  • Uncommitted Voltage Monitor for Power-Fail or Low-Battery Warning (MAX817/MAX819)
  • Manual Reset Input (MAX819)

应用/用途

  • 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

描述

The MAX817/MAX818/MAX819 microprocessor (µP) supervisory circuits simplify power-supply monitoring, battery control, and chip-enable gating in µP systems by reducing the number of components required. These devices are designed for use in +5V-powered systems. Low supply current (11µA typical) and small package size make these devices ideal for portable applications. The MAX817/MAX818/MAX819 are specifically designed to ignore fast transients on VCC. Other supervisory functions include active-low reset, backup-battery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide in the full data sheet lists the specific functions available from each device.

These devices offer two pretrimmed reset threshold voltages for ±5% or ±10% power supplies: 4.65V for the L versions and 4.40V for the M versions. The MAX817/ MAX818/MAX819 are available in space-saving µMAX® packages, as well as 8-pin DIP/SO.

简化框图

MAX817L、MAX817M、MAX818L、MAX818M、MAX819L、MAX819M:典型工作电路 MAX817L、MAX817M、MAX818L、MAX818M、MAX819L、MAX819M:典型工作电路 Zoom icon

Technical Docs

数据资料 +5V微处理器监控电路 Mar 14, 2006

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