MAX820T
Microprocessor and Nonvolatile Memory Supervisory Circuits
Microprocessor and Non-Volatile Memory Supervisory Circuits
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Part Details
- 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)
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.
Applications
- Computers: Desktop, Workstation, Server
- Controllers
- Critical µP Monitoring
- Intelligent Instruments
Documentation
This is the most up-to-date revision of the Data Sheet.
Hardware Ecosystem
Parts | Product Life Cycle | Description |
---|---|---|
Battery Backup IC 6 | ||
MAX791 | PRODUCTION | Microprocessor Supervisory Circuit |
MAX793 | PRODUCTION | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
MAX794 | PRODUCTION | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
MAX795 | PRODUCTION | 3.0V/3.3V Adjustable Microprocessor Supervisory Circuits |
MAX800 | PRODUCTION | Microprocessor Supervisory Circuits |
MAX807 | PRODUCTION | Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy |
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