Features and Benefits
- Precision 4.675V (MAX807L), 4.425V (MAX807M), or 4.575V (MAX807N) Voltage Monitoring
- 200ms Power-OK/Reset Time Delay
- RESET-bar and RESET Outputs
- Independent Watchdog Timer
- 1µA Standby Current
- Power Switching
- 250mA in VCC Mode
- 20mA in Battery-Backup Mode
- On-Board Gating of Chip-Enable Signals;
- 2ns CE Gate Propagation Delay
- MaxCap® and SuperCap Compatible
- Voltage Monitor for Power Fail
- Backup-Battery Monitor
- Guaranteed active-low RESET Valid to VCC = 1V
- ±1.5% Low-Line Threshold Accuracy 52mV above Reset Threshold
The MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control functions in µP systems. A 70µA supply current makes the MAX807 ideal for use in portable equipment, while a 2ns chip-enable propagation delay and 250mA output current capability (20mA in battery-backup mode) make it suitable for larger, higher-performance equipment.
The MAX807 comes in 16-pin DIP, SO, and TSSOP packages, and provides the following functions:
µP reset. The active-low RESET 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. Active-high RESET output. Manual-reset input. Two-stage power-fail warning. A separate low-line comparator compares VCC to a threshold 52mV above the reset threshold. This low-line comparator is more accurate than those in previous µP supervisors. Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic. Write protection of CMOS RAM or EEPROM. 2.275V threshold detector provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V. BATT OK status flag indicates that the backup-battery voltage is above +2.275V. Watchdog-fault outputasserted if the watchdog input has not been toggled within a preset timeout period.
- Computers: Desktop, Workstation, Server
- Critical µP Monitoring
- Intelligent Instruments
- Portable Battery-Powered Equipment
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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