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

• MAX9867 - 低功耗、立体声音频编解码器
• MAX2014 - 50MHz至1000MHz、75dB对数检测器/控制器
• MAX2650 - DC到微波、+5V、低噪声放大器
• MAX4566 - 四/双路、低电压、双向RF/视频开关
• MAX11339 - 500ksps、12/10位、4/8/16通道ADC，提供外部信号调理复用输入
• MAX4915B - 100mA/200mA/300mA限流开关，具有较低的关断反向电流
• MAX3491E - 3.3V供电、±15kV ESD保护、12Mbps、限摆率、真RS-485/RS-422收发器
• PHY1096 - 高灵敏度互阻放大器
• ICL7662 - CMOS、电压变换器
• MAX6424 - 低功耗、SC70/SOT封装、微处理器复位电路，可通过电容调节复位超时周期