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

• MAX9275 - 3.12Gbps GMSL Serializers for Coax or STP Output Drive and Parallel Input
• MAX6833 - 超低电压、SC70封装电压检测器及微处理器复位电路
• MAX2680 - 400MHz至2.5GHz、低噪声、SiGe下变频混频器
• PHY1075 - 125Mbps至4.25Gbps激光驱动器/后置放大器，带有数字诊断功能
• MAX6892 - 引脚可设置八/六/四路电源排序器/监控器
• MAX16050 - 电压监测器/排序电路，可反向排序
• MAX4489 - SOT23封装、低噪声、低失真、宽带、满摆幅运算放大器
• DS1990A - iButton序列号
• MAX1259 - 电池管理器
• MAX15006 - 40V、超低静态电流线性稳压器，6引脚TDFN/8引脚SO封装