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MAX807N

Maxim Integrated Products
Part Number MAX807N
Manufacturer Maxim Integrated Products
Description Full-Featured P Supervisory Circuit with 1.5eset Accuracy
Published Nov 26, 2008
Detailed Description 19-0433; Rev 0; 9/95 Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy _______________General Description ...
Datasheet PDF File MAX807N PDF File

MAX807N
MAX807N


Overview
19-0433; Rev 0; 9/95 Full-Featured µP Supervisory Circuit with ±1.
5% Reset Accuracy _______________General Description 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 and SO packages, and provides the following functions: 1) 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.
2) Active-high RESET output.
3) Manual-reset input.
4) 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.
5) Backup-battery switchover for CMOS RAM, real-time clocks, µPs, or other low-power logic.
6) Write protection of CMOS RAM or EEPROM.
7) 2.
275V threshold detector—provides for power-fail warning and low-battery detection, or monitors a power supply other than +5V.
8) BATT OK status flag indicates that the backup-battery voltage is above 2.
275V.
9) Watchdog-fault output—asserted if the watchdog input has not been toggled within a preset timeout period.
____________________________Features o Precision 4.
675V (MAX807L) or 4.
425V (MAX807M), or 4.
575V (MAX807N) Voltage Monitoring o 200ms Power OK / Reset Time Delay o RESET and RESET Outputs o Independent Watchdog Timer o 1µA Standby Current o Power Switching: 250mA in VCC Mode 20mA in Battery-Backup Mode o On-Board Gating of Chip-Enable Signals: 2ns CE Gate Propagation Delay o MaxCap™ and SuperCap™ Compatible o Voltage Monitor for Power-Fail o Backup-Battery Monitor o Guaranteed RESET V...


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