MAX6826MAX6831 19-1867 Rev 2 12/05 Dual Ultra-Low-Voltage SOT23 P Supervisors with Manual Reset and Watchdog Timer General Description Features The MAX6826MAX6831 are ultra-low-voltage micro- Monitor Primary V Supplies from +1.8V CC processor (P) supervisory circuits designed to monitor to +5.0V and Secondary V Supplies CC2 two power supplies and have manual reset and watch- from +0.9V to +2.5V dog input functions. These devices assert a system reset User Adjustable RESET IN Down to +0.63V if any of the monitored supplies fall below the prepro- (MAX6826/MAX6827/MAX6828) grammed thresholds, and maintain reset for a minimum timeout period after the supplies rise above the threshold. 140ms (min) Reset Timeout Delay Microprocessor supervisors significantly improve system 1.6s Watchdog Timeout Period reliability and accuracy compared to separate ICs or dis- Manual Reset Input crete components. These devices monitor primary volt- ages from +1.8V to +5.0V and secondary voltages from Three Reset Output Options +0.9V to +2.5V. These devices are guaranteed to be in Push-Pull RESET the correct state for V down to +1.0V. CC Push-Pull RESET A variety of preprogrammed reset threshold voltages Open-Drain RESET are available (see the Threshold Suffix Guide). The Guaranteed Reset Valid Down to V = +1.0V CC devices include manual reset and watchdog inputs. The Immune to Short Negative V Transients MAX6829/MAX6830/MAX6831 provide a factory- CC trimmed threshold to monitor a 2nd voltage down to No External Components +0.9V. The MAX6826/MAX6829 have a push-pull Small 6-pin SOT23 Packages RESET, the MAX6827/MAX6830 have a push-pull RESET and the MAX6828/MAX6831 have an open-drain Ordering Information RESET. The MAX6826/MAX6827/MAX6828 have an aux- PART TEMP RANGE PIN-PACKAGE iliary monitor that allows user adjustable input to monitor voltages down to +0.6V. See Selector Guide for func- MAX6826 UT-T -40C to +125C 6 SOT23-6 tions available. MAX6827 UT-T -40C to +125C 6 SOT23-6 MAX6828 UT-T -40C to +125C 6 SOT23-6 Applications MAX6829 UT-T -40C to +125C 6 SOT23-6 Portable/Battery- Automotive Systems Powered Equipment MAX6830 UT-T -40C to +125C 6 SOT23-6 Critical P Monitoring Embedded Controllers M AX6831 UT-T -40C to +125C 6 SOT23-6 Multivoltage Systems Intelligent Instruments Insert the desired suffix letter (from Standard Versions table) into the blanks to complete the part number. Pin Configuration Devices are available in both leaded and lead-free packaging. Specify lead-free by replacing -T with +T when ordering. TOP VIEW Standard Versions Table* RESET(RESET)16 V CC MAX6826 MAX6826/MAX6827/MAX6828 MAX6831 GND 2 5 RESET IN/V CC2 L S R MR34 WDI Z SOT23-6 V (RESET) MAX6827/MAX6830 ONLY *Samples are typically available for standard versions only. RESET IN FOR MAX6826/MAX6827/MAX6828 ONLY V FOR MAX6829/MAX6830/MAX6831 ONLY The MAX6826/MAX6827/MAX6828 require a 2.5k minimum CC2 order increment for all versions. Contact factory for availability. Typical Operating Circuit, Threshold Suffix Guide, and Standard Versions Table continued at end of data sheet. Selector Guide appear at end of data sheet. 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.Dual Ultra-Low-Voltage SOT23 P Supervisors with Manual Reset and Watchdog Timer ABSOLUTE MAXIMUM RATINGS V , V to GND.................................................-0.3V to +6.0V Operating Temperature Range .........................-40C to +125C CC CC2 Junction Temperature......................................................+150C Open-Drain RESET................................................-0.3V to +6.0V Storage Temperature Range .............................-65C to +150C Push-Pull RESET, RESET............................-0.3V to (V + 0.3V) CC Lead Temperature (soldering, 10s) .................................+300C MR, WDI, RESET IN....................................-0.3V to (V + 0.3V) CC Input Current (V ).............................................................20mA CC Output Current (RESET, RESET).........................................20mA Continuous Power Dissipation (T = +70C) A 6-Pin SOT23 (derate 8.7mW/C above +70C)..............696mW 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 = +4.5V to +5.5V for MAX68 L/M, V = +2.7V to +3.6V for MAX68 T/S/R, V = +2.1V to +2.75V for MAX68 Z/Y, CC CC CC V = +1.53V to +2.0V for MAX68 W/V T = -40C to +125C, unless otherwise specified. Typical values are at T = +25C.) (Note 1) CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T = 0C to +85C 1.0 5.5 A Operating Voltage Range V V CC T = -40C to +125C 1.2 5.5 A T = -40C to +85C1020 A V = +5.5V, CC no load T = -40C to +125C30 V Supply Current A CC I A CC MR and WDI Unconnected T = -40C to +85C716 V = +3.6V, A CC no load T = -40C to +125C25 A V Supply Current V +2.5V 2A CC2 CC2 T = -40C to +85C 4.50 4.63 4.75 A MAX68 L T = -40C to +125C 4.47 4.63 4.78 A T = -40C to +85C 4.25 4.38 4.50 A MAX68 M T = -40C to +125C 4.22 4.38 4.53 A T = -40C to +85C 3.00 3.08 3.15 A MAX68 T T = -40C to +125C 2.97 3.08 3.17 A T = -40C to +85C 2.85 2.93 3.00 A MAX68 S T = -40C to +125C 2.83 2.93 3.02 A V Reset Threshold CC V T = -40C to +85C 2.55 2.63 2.70 V A TH (V Falling) CC MAX68 R T = -40C to +125C 2.53 2.63 2.72 A T = -40C to +85C 2.25 2.32 2.38 A MAX68 Z T = -40C to +125C 2.24 2.32 2.40 A T = -40C to +85C 2.12 2.19 2.25 A MAX68 Y T = -40C to +125C 2.11 2.19 2.26 A T = -40C to +85C 1.62 1.67 1.71 A MAX68 W T = -40C to +125C 1.61 1.67 1.72 A MAX68 V T = -40C to +85C 1.52 1.58 1.62 A 2 MAX6826MAX6831