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功能完备的微处理器监控电路,提供±1.5%的复位门限精度

产品详情

主要特征

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 4.0 to 4.5
4.5 to 5.0
Reset Out Active High
Active Low
Push-Pull
ICC (µA) (max) 110
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/16
SOIC (W)/16
TSSOP/16
Budgetary
Price (See Notes)
3.7
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参量

Parametric specs for Battery Backup Circuits
Reset Thresh. (V) 4.0 to 4.5
4.5 to 5.0
Reset Out Active High
Active Low
Push-Pull
ICC (µA) (max) 110
Oper. Temp. (°C) -55 to +125
-40 to +85
0 to +70
Package/Pins PDIP/16
SOIC (W)/16
TSSOP/16
Budgetary
Price (See Notes)
3.7

主要特征

  • Precision 4.675V (MAX807L), 4.425V (MAX807M), or 4.575V (MAX807N) Voltage Monitoring
  • 200ms Power-OK/Reset Time Delay
  • RESET-bar and RESET Outputs
  • Independent Watchdog Timer
  • 1µA Standby Current
  • Power Switching
    • 250mA in VCC Mode
    • 20mA in Battery-Backup Mode
  • On-Board Gating of Chip-Enable Signals;
    • 2ns CE Gate Propagation Delay
  • MaxCap® and SuperCap Compatible
  • Voltage Monitor for Power Fail
  • Backup-Battery Monitor
  • Guaranteed active-low RESET Valid to VCC = 1V
  • ±1.5% Low-Line Threshold Accuracy 52mV above Reset Threshold

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
  • 便携式电池供电设备

描述

The MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. A 70µA supply current makes the MAX807 ideal for use in portable equipment, while a 2ns chip-enable propagation delay and 250mA output current capability (20mA in battery-backup mode) make it suitable for larger, higher-performance equipment.

The MAX807 comes in 16-pin DIP, SO, and TSSOP packages, and provides the following functions:
  • µP reset. The active-low RESET output is asserted during power-up, power-down, and brownout conditions, and is guaranteed to be in the correct state for VCC down to 1V.
  • Active-high RESET output.
  • Manual-reset input.
  • Two-stage power-fail warning. A separate low-line comparator compares VCC to a threshold 52mV above the reset threshold. This low-line comparator is more accurate than those in previous µP supervisors.
  • Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic.
  • Write protection of CMOS RAM or EEPROM.
  • 2.275V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V.
  • BATT OK status flag indicates that the backup-battery voltage is above +2.275V.
  • Watchdog-fault output—asserted if the watchdog input has not been toggled within a preset timeout period.
  • 简化框图

    MAX807L、MAX807M、MAX807N:典型工作电路 MAX807L、MAX807M、MAX807N: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