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

• DS1083L - 16MHz至134MHz扩频时钟调制器，用于LCD板
• MAX3391E - ±15kV ESD保护、1µA、16Mbps、双/四路、低电压电平转换器，UCSP封装
• MAX4006 - 高精度、高端电流监测，SOT23封装
• DS1086|DS1086H|DS1086Z - 扩频EconOscillator
• MAX4383 - 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
• MAX9610 - 1µA、µDFN/SC70封装、用于锂离子电池的高精度电流检测放大器
• MAX4940|MAX4940A - 双/四通道、单/双极性、高压数字脉冲发生器
• MAX1119 - 单电源、低功耗、2通道、串行8位ADC
• MAX6776 - 低功耗、精度达1%的电池监测器，提供µDFN和SC70封装
• MAX4785 - 50mA/100mA限流开关