MAX792T
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MAX792T

Microprocessor and Nonvolatile Memory Supervisory Circuits

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Microprocessor and Non-Volatile Memory Supervisory Circuits

Features
  • 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)
Additional Details
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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 preset threshold 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 timeout period.
  • Pulsed watchdog output: Advance warning of impending active-low WDO assertion from watchdog timeout that causes 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%).

Applications

  • Computers: Desktop, Workstation, Server
  • Controllers
  • Critical µP Monitoring
  • Intelligent Instruments

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