MAX807L|MAX807M|MAX807N - 功能完备的微处理器监控电路，提供±1.5%的复位门限精度

MAX807L|MAX807M|MAX807N - 功能完备的微处理器监控电路，提供±1.5%的复位门限精度 - 美信芯片 - Maxim美信半导体高性能芯片品质 - 美信半导体

产品概述

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.

关键特性

以下关键特性由Maxim美信半导体提供：

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

热门应用

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

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