MAX6730MAX6735 Single-/Dual-/Triple-Voltage P Supervisory Circuits with Independent Watchdog Output General Description Features The MAX6730MAX6735 single-/dual-/triple-voltage V 1 (Primary Supply) Reset Threshold Voltages CC microprocessor (P) supervisors feature a watchdog from +1.575V to +4.63V timer and manual reset capability. The MAX6730 V 2 (Secondary Supply) Reset Threshold CC MAX6735 offer factory-set reset thresholds for monitor- Voltages from +0.79V to +3.08V ing voltages from +0.9V to +5V and an adjustable reset input for monitoring voltages down to +0.63V. The com- Adjustable RSTIN Threshold for Monitoring bination of these features significantly improves system Voltages Down to +0.63V (MAX6734/MAX6735 Only) reliability and accuracy when compared to separate Six Reset Timeout Options ICs or discrete components. Watchdog Timer with Independent Watchdog Output The active-low reset output asserts and remains asserted for the reset timeout period after all the monitored volt- 35s (min) Initial Watchdog Startup Period ages exceed their respective thresholds. Multiple factory- 1.12s (min) Normal Watchdog Timeout Period set reset threshold combinations reduce the number of Manual Reset Input external components required. The MAX6730/MAX6731 (MAX6730/MAX6731/MAX6734/MAX6735) monitor a single fixed voltage, the MAX6732/MAX6733 monitor two fixed voltages, and the MAX6734/MAX6735 Guaranteed Reset Valid down to monitor two fixed voltages and one adjustable voltage. All V 1 or V 2 = +0.8V CC CC devices are offered with six minimum reset timeout peri- Push-Pull RESET or Open-Drain RESET Output ods ranging from 1.1ms to 1120ms. Immune to Short V Transients CC The MAX6730MAX6735 feature a watchdog timer with an independent watchdog output. The watchdog timer Low Supply Current: 14A (typ) at +3.6V prevents system lockup during code execution errors. Small 6-Pin and 8-Pin SOT23 Packages A watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watch- Ordering Information dog operates in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide PART* TEMP RANGE PIN-PACKAGE an active-low, open-drain watchdog output. The MAX6731/MAX6733/MAX6735 provide an active-low, MAX6730UT D -T -40C to +85C 6 SOT23 push-pull watchdog output. MAX6731UT D -T -40C to +85C 6 SOT23 Other features include a manual reset input (MAX6730/ MAX6732UT D -T -40C to +85C 6 SOT23 MAX6731/MAX6734/MAX6735) and push-pull reset out- MAX6733UT D -T -40C to +85C 6 SOT23 put (MAX6731/MAX6733/MAX6735) or open-drain reset MAX6734KA D -T -40C to +85C 8 SOT23 output (MAX6730/MAX6732/MAX6734). The MAX6730 MAX6733 are offered in a tiny SOT23-6 package. The MAX6734KA D /V-T -40C to +85C 8 SOT23 MAX6734/MAX6735 are offered in a space-saving MAX6735KA D -T -40C to +85C 8 SOT23 SOT23-8 package. All devices are fully specified over *Insert the threshold level suffixes for V 1 and V 2 (Table 1) CC CC the extended -40C to +85C temperature range. after UT or KA. For the MAX6730/MAX6731, insert only the V 1 threshold suffix after the UT. Insert the reset timeout CC Applications delay (Table 2) after D to complete the part number. For exam- Multivoltage Systems ple, the MAX6732UTLTD3-T provides a V 1 threshold of CC +4.625V, a V 2 threshold of +3.075V, and a 210ms reset time- CC Telecom/Networking Equipment out period. Sample stock is generally held on standard versions Computers/Servers only (see the Standard Versions table). Standard versions have an order increment requirement of 2500 pieces. Nonstandard Portable/Battery-Operated Equipment versions have an order increment requirement of 10,000 pieces. Industrial Equipment Contact factory for availability. Devices are available in both leaded and lead(Pb)-free/RoHS- Printer/Fax compliant packaging. Set-Top Boxes Specify lead-free by replacing -T with +T when ordering. /V denotes an automotive qualified part. Typical Operating Circuit and Pin Configurations appear at end of data sheet. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxims website at www.maximintegrated.com. 19-2629 Rev 7 4/13MAX6730MAX6735 Single-/Dual-/Triple-Voltage P Supervisory Circuits with Independent Watchdog Output ABSOLUTE MAXIMUM RATINGS V 1, V 2, RSTIN, MR, WDI to GND.....................-0.3V to +6V Operating Temperature Range ...........................-40C to +85C CC CC Storage Temperature Range .............................-65C to +150C RST, WDO to GND (open drain)...............................-0.3V to +6V Junction Temperature......................................................+150C RST, WDO to GND (push-pull).................-0.3V to (V 1 + 0.3V) CC Input Current/Output Current (all pins) ...............................20mA Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) Continuous Power Dissipation (T = +70C) A 6-Pin SOT23-6 (derate 4.3mW/C above +70C) .....347.8mW Lead (Pb)-free packages.............................................+260C Package containing lead (Pb) .....................................+240C 8-Pin SOT23-8 (derate 5.6mW/C above +70C) .....444.4mW 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. PACKAGE THERMAL CHARACTERISTICS (Note 1) 6 SOT23 8 SOT23 Junction-to-Ambient Thermal Resistance ( ).......230C/W Junction-to-Ambient Thermal Resistance ( ).......180C/W JA JA Junction-to-Case Thermal Resistance ( )..............76C/W Junction-to-Case Thermal Resistance ( )..............60C/W JC JC Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial. ELECTRICAL CHARACTERISTICS (V 1 = V 2 = +0.8V to +5.5V, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) CC CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 1, V 2 0.8 5.5 V CC CC V 1 < +5.5V, all I/O connections CC 15 39 open, outputs not asserted I 1 CC V 1 < +3.6V, all I/O connections CC 10 28 open, outputs not asserted Supply Current A V 2 < +3.6V, all I/O connections CC 4 11 open, outputs not asserted I 2 CC V 2 < +2.75V, all I/O connections CC 3 9 open, outputs not asserted L (falling) 4.500 4.625 4.750 M (falling) 4.250 4.375 4.500 T (falling) 3.000 3.075 3.150 S (falling) 2.850 2.925 3.000 V 1 Reset Threshold V 1 R (falling) 2.550 2.625 2.700 V CC TH Z (falling) 2.250 2.313 2.375 Y (falling) 2.125 2.188 2.250 W (falling) 1.620 1.665 1.710 V (falling) 1.530 1.575 1.620 2 Maxim Integrated