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

• MAX5410 - 双路、音量调节、对数数字电位器
• MAX13084E - +5.0V、±15kV ESD保护、失效保护、热插拔、RS-485/RS-422收发器
• MAX1973 - 尺寸最小的1A、1.4MHz降压型稳压器
• MAX3646 - 155Mbps至622Mbps SFF/SFP激光驱动器，带有消光比控制
• MAX5258 - +3V/+5V、低功耗、8位八通道DAC，带有满摆幅输出缓冲器
• MAX9377 - 任意逻辑至LVPECL/LVDS转换器，引脚可设置四分频电路
• MAX11662 - 500ksps、低功耗、串行12/10/8位ADC
• MAX2642 - 900MHz、SiGe、可变的高IP3、低噪声放大器
• MAX1644 - 2A、低电压、降压型稳压器，内置同步整流与开关
• MAX6629 - 12位 + 符号位数字温度传感器，串行接口