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)

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控制器

精确的µP监控

智能仪表

MAX6351 - 双/三电压微处理器监控电路

MAX2207 - RF功率检测器，UCSP封装

MAX4382 - 超小型、低成本、210MHz、单电源运算放大器，带有满摆幅输出及禁止功能

MAX485E - ±15kV ESD保护、限摆率、低功耗、RS-485/RS-422收发器

MAX6303 - +5V、低功耗、微处理器监控电路，带有可调节的复位/看门狗定时器

MAX1484 - 软件可选的、半/全双工、限摆率、12Mbps、RS-485/RS-422收发器，µMAX封装

MAX4782 - 高速、低电压、0.7Ω、CMOS模拟开关/多路复用器

MAX6758 - 低功耗、单/双电压窗检测器

MAX6394 - 高精度微处理器复位电路

MAX5087A|MAX5087B - 45V、400mA、低静态电流线性稳压器，带有可调节复位延时