MAX805R
3.0V/3.3V Microprocessor Supervisory Circuits
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Industry's-First Battery-Backup Supervisor for 3.3V/3.0V Systems
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Features
- Active-Low RESET and RESET Outputs
- Manual Reset Input
- Precision Supply-Voltage Monitor
- 200ms Reset Time Delay
- Watchdog Timer (1.6sec timeout)
- Battery-Backup Power Switching-Battery Can Exceed VCC in Normal Operation
- 40µA VCC Supply Current
- 1µA Battery Supply Current
- Voltage Monitor for Power-Fail or Low-Battery Warning
- Guaranteed Active-Low RESET Assertion to VCC = 1V
- 8-Pin DIP and SO Packages
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These microprocessor (µP) supervisory circuits reduce the complexity and number of components required for power-supply monitoring and battery-control functions in µP systems. They significantly improve system reliability and accuracy compared to separate ICs or discrete components.
These devices are designed for use in systems powered by 3.0V or 3.3V supplies. See the selector guide in the back of this data sheet for similar devices designed for 5V systems. The suffixes denote different reset threshold voltages: 3.075V (T), 2.925V (S), and 2.625V (R) (see Reset Threshold section in the Detailed Description). All these parts are available in 8-pin DIP and SO packages. Functions offered in this series are as follows:
| Part | Active-Low Reset | Active-High Reset | Watchdog Input | Manual Reset Input | Backup-Battery Switch | Power-Fail Threshold Accuracy | Power-Fail Comparator | Reset Window |
| MAX690 | √ | √ | √ | ±4% | √ | ±75mV | ||
| MAX704 | √ | √ | √ | ±4% | √ | ±75mV | ||
| MAX802 | √ | √ | √ | ±2% | √ | ±2% | ||
| MAX804 | √ | √ | √ | ±2% | √ | ±2% | ||
| MAX805 | √ | √ | √ | ±4% | √ | ±75mV | ||
| MAX806 | √ | √ | √ | ±2% | √ | ±2% |
Applications
- Battery-Powered Computers/Controllers
- Critical µP Monitoring
- Embedded Controllers
- Intelligent Instruments
- Portable Equipment
Ask a Question
Submit your question below and we will return the best answer from ADI’s knowledge database:
Search
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Support
Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.
Visit the ADI Support Page
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MAX805R
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Software & Part Ecosystem
| Parts | Product Life Cycle | Description | ||
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Battery Backup IC4 |
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PRODUCTION |
SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup |
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PRODUCTION |
SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup |
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PRODUCTION |
SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup |
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PRODUCTION |
SOT23, Low-Power Microprocessor Supervisory Circuits with Battery Backup |
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