Products
MAX791
PRODUCTIONMicroprocessor Supervisory Circuit
Full-Function µP Supervisory Circuit
- Part Models
- 7
- 1ku List Price
- Starting From $7.21
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Overview
- Precision 4.65V Voltage Monitoring
- 200ms Power-OK/Reset Time Delay
- Independent Watchdog Timer-Preset or Adjustable
- 1µA Standby Current
- Power Switching
- 250mA Output in VCC Mode
- 25mA Output in Battery-Backup Mode
- On-Board Gating of Chip-Enable Signals
- Memory Write-Cycle Completion
- 6ns CE Gate Propagation Delay
- MaxCap™ or SuperCap™ Compatible
- Voltage Monitor for Power-Fail or Low-Battery Warning
- Backup-Battery Monitor
- Guaranteed RESET-bar Valid to VCC = 1V
The MAX791 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. The 50µA supply current makes the MAX791 ideal for use in portable equipment, while the 6ns chip-enable propagation delay and 250mA output capability (25mA in battery-backup mode) make it suitable for larger, higher-performance equipment.
The MAX791 comes in 16-pin DIP and narrow SO packages and provides the following functions:
- µP reset-RESET-bar output is asserted during power-up, power-down, and brownout conditions, and is guaranteed to be in the correct state for VCC down to 1V, even with no battery in the circuit.
- Manual-reset input.
- A 1.25V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V.
- Two-stage power-fail warning-a separate low-line comparator compares VCC to a threshold 150mV above the reset threshold.
- Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic.
- Software monitoring of backup-battery voltage.
- A watchdog-fault output is asserted if the watchdog input has not been toggled within either a preset or an adjustable timeout period.
- Write protection of CMOS RAM or EEPROM.
- Pulsed watchdog output, to give advance warning of impending WDO-bar assertion caused by watchdog timeout.
Applications
- Computers: Desktop, Workstation, Server
- Controllers
- Critical µP Monitoring
- Intelligent Instruments
- Portable Battery-Powered Equipment
Documentation
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX791CPE+ | Plastic Dual-In-Line, Narrow (0.3in) | ||
| MAX791CSE+ | SOIC_N | ||
| MAX791CSE+T | SOIC_N | ||
| MAX791EPE+ | Plastic Dual-In-Line, Narrow (0.3in) | ||
| MAX791ESE+ | SOIC_N | ||
| MAX791ESE+T | SOIC_N | ||
| MAX791MJE | Ceramic Dual-In-Line, Narrow (0.3in) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 11, 2025 - 2361S WAFER FAB |
||
| MAX791CPE+ | PRODUCTION | |
| MAX791CSE+ | PRODUCTION | |
| MAX791CSE+T | PRODUCTION | |
| MAX791EPE+ | PRODUCTION | |
| MAX791ESE+ | PRODUCTION | |
| MAX791ESE+T | PRODUCTION | |
| MAX791MJE | PRODUCTION | |
|
Apr 20, 2026 - 2571A PIN/ERRATA |
||
| MAX791CSE+T | PRODUCTION | |
| MAX791ESE+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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| Parts | Product Life Cycle | Description |
|---|---|---|
| Supervisory Circuits & Reset ICs 7 | ||
| MAX792 | PRODUCTION | Microprocessor and Nonvolatile Memory Supervisory Circuits |
| MAX820 | PRODUCTION | Microprocessor and Nonvolatile Memory Supervisory Circuits |
| 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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