Click here for production status of specific part numbers. MAX6730MAX6735 Single/Dual/Triple-Voltage P Supervisory Circuits with Independent Watchdog Output General Description Benefits and Features The MAX6730MAX6735 single/dual/triple-voltage micro- V 1 (Primary Supply) Reset Threshold Voltages CC processor (P) supervisors feature a watchdog timer and from +1.575V to +4.63V manual reset capability. The MAX6730MAX6735 offer V 2 (Secondary Supply) Reset Threshold Voltages CC factory-set reset thresholds for monitoring voltages from from +0.79V to +3.08V +0.9V to +5V and an adjustable reset input for monitoring Adjustable RSTIN Threshold for Monitoring Voltages voltages down to +0.63V. The combination of these features Down to +0.63V (MAX6734/MAX6735 Only) significantly improves system reliability and accuracy when Six Reset Timeout Options compared to separate ICs or discrete components. Watchdog Timer with Independent Watchdog Output The active-low reset output asserts and remains asserted 35s (min) Initial Watchdog Startup Period for the reset timeout period after all the monitored voltages 1.12s (min) Normal Watchdog Timeout Period exceed their respective thresholds. Multiple factory-set reset Manual Reset Input threshold combinations reduce the number of external (MAX6730/MAX6731/MAX6734/MAX6735) components required. The MAX6730/MAX6731 monitor a single fixed voltage, the MAX6732/MAX6733 monitor two Guaranteed Reset Valid down to fixed voltages, and the MAX6734/MAX6735 monitor two V 1 or V 2 = +0.8V CC CC fixed voltages and one adjustable voltage. All devices are Push-Pull RESET or Open-Drain RESET Output offered with six minimum reset timeout periods ranging from Immune to Short V Transients CC 1.1ms to 1120ms. Low Supply Current: 14A (typ) at +3.6V The MAX6730MAX6735 feature a watchdog timer with Small 6-Pin and 8-Pin SOT23 Packages an independent watchdog output. The watchdog timer AEC-Q100 Qualified: MAX6734KATGD3/V+T, prevents system lockup during code execution errors. A MAX6734KALTD3/V+T watchdog startup delay of 54s after reset asserts allows system initialization during power-up. The watchdog operates Pin Configurations appear at end of data sheet. in normal mode with a 1.68s delay after initialization. The MAX6730/MAX6732/MAX6734 provide an active-low, open-drain watchdog output. The MAX6731/MAX6733/ Typical Operating Circuit MAX6735 provide an active-low, push-pull watchdog output. +1.8V Other features include a manual reset input (MAX6730/ +0.9V MAX6731/MAX6734/MAX6735) and push-pull reset output V +3.3V CORE (MAX6731/MAX6733/MAX6735) or open-drain reset output (MAX6730/MAX6732/MAX6734). The MAX6730 V V V 2 V 1 CC DD CC CC MAX6733 are offered in a tiny SOT23-6 package. The (I/O) (MEMORY) MAX6734/MAX6735 are offered in a space-saving RSTIN RST RESET SOT23-8 package. All devices are fully specified over the MAX6734 extended -40C to +85C temperature range. P WDI I/O MAX6735 Applications Multivoltage Systems WDO NMI PUSHBUTTON Telecom/Networking Equipment MR SWITCH Computers/Servers GND GND Portable/Battery-Operated Equipment Industrial Equipment Printer/Fax Set-Top Boxes Automotive 19-2629 Rev 10 3/19MAX6730MAX6735 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 RST, WDO to GND (open drain) .............................-0.3V to +6V Storage Temperature Range ............................ -65C to +150C RST, WDO to GND (push-pull) .............. -0.3V to (V 1 + 0.3V) Junction Temperature ......................................................+150C CC Input Current/Output Current (all pins) ...............................20mA Lead Temperature (soldering, 10s) .................................+300C Continuous Power Dissipation (T = +70C) Soldering Temperature (reflow) A 6-Pin SOT23-6 (derate 4.3mW/C above +70C) ....347.8mW Lead (Pb)-free packages.............................................+260C 8-Pin SOT23-8 (derate 5.6mW/C above +70C) ....444.4mW Package containing lead (Pb) .....................................+240C 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. (Note 1) Package Thermal Characteristics 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 V 1, CC Supply Voltage 0.8 5.5 V V 2 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 Maxim Integrated 2 www.maximintegrated.com