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

• MAX1321 - 8/4/2通道、14位、同时采样ADC，提供±10V、±5V或0至+5V模拟输入范围
• MAX17498C - AC-DC和DC-DC峰值电流模式转换器，支持反激/Boost应用
• MAX6726 - 双/三路、超低电压、SOT23封装、微处理器监控电路
• MAX485E - ±15kV ESD保护、限摆率、低功耗、RS-485/RS-422收发器
• DG401 - 改进的双路、高速模拟开关
• MAX16014 - 超小型、过压保护/检测电路
• MAX8940 - 低噪声、高PSRR、低压差、120mA线性稳压器
• MAX19996A - SiGe、高线性度、2000MHz至3900MHz下变频混频器，带有LO缓冲器
• MAX4667 - 2.5Ω、双路、SPST、CMOS模拟开关
• MAX34441 - PMBus 5通道电源管理器和智能风扇控制器