MAX807L/M/N 19-0433 Rev 4 11/05 Full-Featured P Supervisory Circuit with 1.5% Reset Accuracy General Description Features The MAX807 microprocessor (P) supervisory circuit Precision 4.675V (MAX807L), 4.425V (MAX807M), reduces the complexity and number of components or 4.575V (MAX807N) Voltage Monitoring needed to monitor power-supply and battery-control func- 200ms Power-OK/Reset Time Delay tions in P systems. A 70A supply current makes the MAX807 ideal for use in portable equipment, while a 2ns RESET and RESET Outputs chip-enable propagation delay and 250mA output current Independent Watchdog Timer capability (20mA in battery-backup mode) make it suit- able for larger, higher-performance equipment. 1A Standby Current The MAX807 comes in 16-pin DIP, SO, and TSSOP pack- Power Switching ages, and provides the following functions: 250mA in V Mode CC P reset. The active-low RESET output is asserted dur- 20mA in Battery-Backup Mode ing power-up, power-down, and brownout conditions, On-Board Gating of Chip-Enable Signals and is guaranteed to be in the correct state for V CC down to 1V. 2ns CE Gate Propagation Delay Active-high RESET output. MaxCap and SuperCap Compatible Manual-reset input. Voltage Monitor for Power Fail Two-stage power-fail warning. A separate low-line Backup-Battery Monitor comparator compares V to a threshold 52mV above CC the reset threshold. This low-line comparator is more Guaranteed RESET Valid to V = 1V CC accurate than those in previous P supervisors. 1.5% Low-Line Threshold Accuracy 52mV above Backup-battery switchover for CMOS RAM, real-time Reset Threshold clocks, Ps, 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. Pin Configuration BATT OK status flag indicates that the backup-battery voltage is above +2.275V. TOP VIEW Watchdog-fault outputasserted if the watchdog input PFI OUT 1 16 has not been toggled within a preset timeout period. BATT OK PFO 2 15 Applications V BATT CC 3 14 Computers WDI 4 MAX807 13 BATT ON Controllers GND CE IN 5 12 Intelligent Instruments MR 6 11 CE OUT Critical P Power Monitoring LOW LINE 7 10 WDO Portable/Battery-Powered Equipment RESET 8 9 RESET DIP/SO/TSSOP 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. Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct at 1-888-629-4642, or visit Maxims website at www.maxim-ic.com.Full-Featured P Supervisory Circuit with 1.5% Reset Accuracy ABSOLUTE MAXIMUM RATINGS Input Voltages (with respect to GND) Continuous Power Dissipation (T = +70C) A V ..........................................................................-0.3V to 6V Plastic DIP (derate 10.53mW/C above +70C) ..........842mW CC V .......................................................................-0.3V to 6V Wide SO (derate 9.52mW/C above +70C)................762mW BATT All Other Inputs......................................-0.3V to (V + 0.3V) CERDIP (derate 10.00mW/C above +70C)...............800mW OUT Input Current TSSOP (derate 6.70 mW/C above +70C) .................533mW V Peak ...........................................................................1.0A Operating Temperature Ranges CC V Continuous .............................................................500mA MAX807 C E ......................................................0C to +70C CC I Peak......................................................................250mA MAX807 E E ...................................................-40C to +85C BATT I Continuous .............................................................50mA MAX807 MJE ................................................-55C to +125C BATT GND .................................................................................50mA Storage Temperature Range .............................-65C to +160C All Other Inputs ................................................................50mA Lead Temperature (soldering, 10s) .................................+300C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (V = 4.60V to 5.5V for the MAX807L, V = 4.50V to 5.5V for the MAX807N, V = 4.35V to 5.5V for the MAX807M, CC CC CC V = 2.8V, V = 0V, T = T to T . Typical values are tested with V = 5V and T = +25C, unless otherwise noted.) BATT PFI A MIN MAX CC A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range 0 5.5 V V , V (Note 1) BATT CC I = 25mA V - 0.02 OUT CC I = 250mA, OUT V - 0.35 V - 0.22 CC CC MAX807C/E V = 4.5V V in Normal Operating CC OUT V Mode I = 250mA, OUT V - 0.45 CC MAX807M V = 3V, V = 2.8V, I = 100mA V - 0.25 V - 0.12 CC BATT OUT CC CC MAX807C/E 1.0 1.4 V = 4.5V, CC I = 250mA V to OUT On-Resistance OUT MAX807M 1.8 CC V = 3V, I = 100mA 1.2 2.5 CC OUT V = 4.5V, I = 20mA, V = 0V V - 0.17 BATT OUT CC BATT V in Battery-Backup Mode V = 2.8V, I = 10mA, V = 0V V - 0.25 V - 0.12 V OUT BATT OUT CC BATT BATT V = 2.0V, I = 5mA, V = 0V V - 0.20 V - 0.08 BATT OUT CC BATT BATT V = 4.5V, I = 20mA 8.5 BATT OUT BATT to OUT On-Resistance V = 2.8V, I = 10mA 12 25 BATT OUT V = 2.0V, I = 5mA 16 40 BATT OUT Supply Current in Normal 70 110 A Operating Mode (excludes I ) OUT T = +25C 0.4 1 A Supply Current in Battery- Backup Mode (excludes I ) V = 0V, V = 2.8V MAX807C/E 5 A OUT CC BATT (Note 2) MAX807M 50 T = +25C -0.1 0.1 A BATT Standby Current (Note 3) V = 2.8V, V = 3.0V A BATT CC T = T to A MIN -1.0 1.0 T MAX Power up V + 0.05 BATT Battery-Switchover Threshold V = 2.8V V BATT Power down V BATT Battery-Switchover Hysteresis 50 mV BATT ON Output, Low Voltage V , I = 3.2mA 0.1 0.4 V RST (max) SINK BATT ON Output, High Voltage V = 0V, I = 0.1mA, V = 2.8V 2 2.7 V CC SOURCE BATT 2 MAX807L/M/N