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 presetthreshold 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 timeoutperiod.
• Pulsed watchdog output: Advance warning of impending active-low WDO assertion from watchdog timeout thatcauses 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%).

以下关键特性由Maxim美信半导体提供：

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)

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

• MAX982 - 超低功耗、漏极开路输出、单/双电源比较器
• MAX31722 - 数字温度计和温度监控器，带有SPI/3线接口
• MAX9244 - 21位解串器，提供可编程扩频和直流平衡
• MAX4199 - 微功耗、单电源、满摆幅、精密差分放大器
• MAX11607 - 2.7V至3.6V和4.5V至5.5V、低功耗、4/8/12通道、2线串口、10位ADC
• MAX1270EVC16 - MAX1270、MAX1271、MAX127和MAX128评估板/评估系统
• MAX200 - +5V、RS-232收发器，0.1µF外部电容
• MAX4749 - 50Ω、低电压、四路SPST/双路SPDT模拟开关，UCSP封装
• MAX4228 - 1GHz、低功耗、SOT23封装、电流反馈放大器，带有关断
• DS1868B - 2通道数字电位器