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Voltage Supervisors 
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MAX804S
3.0V/3.3V Microprocessor Supervisory Circuits
Industry's-First Battery-Backup Supervisor for 3.3V/3.0V Systems
MyMaxim SubscriptionsProduct Details
Key Features
Applications/Uses
Simplified Block Diagram
Technical Docs
| Data Sheet | 3.0V/3.3V Microprocessor Supervisory Circuits | Apr 01, 2015 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
Key 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
Applications/Uses
- Battery-Powered Computers/Controllers
- Critical µP Monitoring
- Embedded Controllers
- Intelligent Instruments
- Portable Equipment
Description
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:
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% |
Technical Docs
| Data Sheet | 3.0V/3.3V Microprocessor Supervisory Circuits | Apr 01, 2015 |
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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