MAX817L/M, MAX818L/M, MAX819L/M* 19-0486 Rev 3 12/05 +5V Microprocessor Supervisory Circuits General Description Features The MAX817/MAX818/MAX819 microprocessor (P) Precision Supply-Voltage Monitor: supervisory circuits simplify power-supply monitoring, 4.65V (MAX81 L) battery control, and chip-enable gating in P systems 4.40V (MAX81 M) by reducing the number of components required. 11A Quiescent Supply Current These devices are designed for use in +5V-powered 200ms Reset Time Delay systems. Low supply current (11A typical) and small package size make these devices ideal for portable Watchdog Timer with 1.6sec Timeout applications. The MAX817/MAX818/MAX819 are specif- (MAX817/MAX818) ically designed to ignore fast transients on V . Other CC Battery-Backup Power Switching Battery Voltage supervisory functions include active-low reset, backup- Can Exceed V CC battery switchover, watchdog input, battery freshness seal, and chip-enable gating. The Selector Guide below Battery Freshness Seal lists the specific functions available from each device. On-Board, 3ns Gating of Chip-Enable Signals These devices offer two pretrimmed reset threshold volt- (MAX818) ages for 5% or 10% power supplies: 4.65V for the L Uncommitted Voltage Monitor for Power-Fail or versions and 4.40V for the M versions. The MAX817/ Low-Battery Warning (MAX817/MAX819) MAX818/MAX819 are available in space-saving MAX packages, as well as 8-pin DIP/SO. Manual Reset Input (MAX819) Ordering Information Selector Guide PART TEMP. RANGE PIN-PACKAGE MAX817 MAX818 MAX819 FEATURE MAX817 CPA 0C to +70C 8 Plastic DIP L/M L/M L/M MAX817 CSA 0C to +70C 8 SO Active-Low Reset MAX817 CUA 0C to +70C 8 MAX Backup-Battery Switchover Ordering Information continued on last page. Power-Fail Comparator These parts offer a choice of reset threshold voltage. From the Watchdog Input table below, select the suffix corresponding to the desired Battery Freshness Seal threshold and insert it into the blank to complete the part number. Devices are available in both leaded and lead-free packaging. Manual Reset Input Specify lead free by adding the + symbol at the end of the part Chip-Enable Gating number when ordering. 8-DIP/SO/ 8-DIP/SO/ 8-DIP/SO/ Pin-Package MAX MAX MAX SUFFIX RESET THRESHOLD (V) L 4.65 Low-Power, Pin- MAX690A/ MAX703/ Compatible Upgrades for: MAX692A MAX704 M 4.40 Pin Configurations Applications TOP VIEW Battery-Powered Computers and Controllers Embedded Controllers OUT 1 8 BATT Intelligent Instruments 2 7 RESET V CC Critical P Monitoring MAX817 GND 3 6 WDI Portable Equipment PFI 4 5 PFO Typical Operating Circuit appears at end of data sheet. DIP/SO/MAX Pin Configurations continued at end of data sheet. *P 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.+5V Microprocessor Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Input Voltage Continuous Power Dissipation (T = +70C) A V , BATT ..........................................................-0.3V to +6.0V Plastic DIP (derate 9.09mW/C above +70C) .............727mW CC All Other Pins (Note 1).............................-0.3V to (V + 0.3V) SO (derate 5.88mW/C above +70C)..........................471mW CC Input Current MAX (derate 4.10mW/C above +70C) .....................330mW V Peak ..............................................................................1A Operating Temperature Ranges CC V Continuous .............................................................250mA MAX81 C A ......................................................0C to +70C CC BATT Peak .....................................................................250mA MAX81 E A ...................................................-40C to +85C BATT Continuous .............................................................50mA Storage Temperature Range .............................-65C to +160C GND .................................................................................25mA Lead Temperature (soldering, 10sec) .............................+300C Output Current OUT................................................................................250mA All Other Outputs .............................................................25mA OUT Short-Circuit Duration.................................................10sec Note 1: The input voltage limits on PFI and WDI may be exceeded (up to 12V V ) if the current into these pins is limited to less IN than 10mA. 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 = +4.75V to +5.5V for MAX81 L, V = +4.5V to +5.5V for MAX81 M, V = 2.8V, T = T to T , unless otherwise CC CC BATT A MIN MAX noted. Typical values are at T = +25C.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Operating Voltage Range, V , CC 0 5.5 V V (Note 2) BATT MAX81 C 11 45 As applicable CE IN = 0V, Supply Current (excluding I ) I A OUT SUPPLY WDI and MR unconnected MAX81 E 11 60 T = +25C 0.05 1.0 A Supply Current in Battery- V = 0V A CC T = T to A MIN Backup Mode (excluding I ) OUT 5.0 T MAX T = +25C -0.10 0.02 A BATT Standby Current (Note 3) 5.5V > V > (V + 0.2V) A CC BATT T = T to A MIN -1.00 0.02 T MAX BATT Leakage Current, V = 0V, V = 0V 1 A CC OUT Freshness Seal Enabled V - V - CC CC I = 5mA OUT 0.05 0.025 V Output V OUT V - V - CC CC I = 50mA OUT 0.5 0.25 V to OUT On-Resistance 510 CC BATT to OUT On-Resistance 100 V V BATT - BATT - V in Battery-Backup Mode I = 250A, V < (V - 0.2V) V OUT OUT CC BATT 0.1 0.02 Power-up 20 Battery Switch Threshold V < V mV CC RST (V - V ) CC BATT Power-down -20 Battery Switchover Hysteresis 40 mV 2 MAX817L/M, MAX818L/M, MAX819L/M*