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MAX807NCWE Datasheet(HTML) 1 Page - Maxim Integrated Products |
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MAX807NCWE Datasheet(HTML) 1 Page - Maxim Integrated Products |
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General Description The MAX807 microprocessor (µP) supervisory circuit reduces the complexity and number of components needed to monitor power-supply and battery-control func- tions 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 suit- able for larger, higher-performance equipment. The MAX807 comes in 16-pin DIP, SO, and TSSOP pack- ages, and provides the following functions: •µP reset. The active-low RESET output is asserted dur- ing 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 output—asserted if the watchdog input has not been toggled within a preset timeout period. Applications Computers Controllers Intelligent Instruments Critical µP Power Monitoring Portable/Battery-Powered Equipment Features ♦ Precision 4.675V (MAX807L), 4.425V (MAX807M), or 4.575V (MAX807N) Voltage Monitoring ♦ 200ms Power-OK/Reset Time Delay ♦ RESET 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 RESET Valid to VCC = 1V ♦ ±1.5% Low-Line Threshold Accuracy 52mV above Reset Threshold Full-Featured µP Supervisory Circuit with ±1.5% Reset Accuracy ________________________________________________________________ Maxim Integrated Products 1 19-0433; Rev 4; 11/05 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 RESET RESET WDO CE IN GND VCC OUT BATT TOP VIEW MAX807 CE OUT WDI LOW LINE MR BATT OK PFI PFO BATT ON DIP/SO/TSSOP Pin Configuration Ordering Information and Typical Operating Circuit appear at end of data sheet. SuperCap is a registered trademark of Baknor Industries. MaxCap is a registered trademark of Cesiwid, Inc. |
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