MAX6715MAX6729 19-2325 Rev 5 12/05 Dual/Triple Ultra-Low-Voltage SOT23 P Supervisory Circuits General Description Features The MAX6715MAX6729 are ultra-low-voltage microproces- V 1 (primary supply) Reset Threshold Voltages CC sor (P) supervisory circuits designed to monitor two or three from 1.58V to 4.63V system power-supply voltages. These devices assert a sys- V 2 (secondary supply) Reset Threshold CC tem reset if any monitored supply falls below its factory- Voltages from 0.79V to 3.08V trimmed or adjustable threshold and maintain reset for a minimum timeout period after all supplies rise above their Externally Adjustable RSTIN Threshold for thresholds. The integrated dual/triple supervisory circuits sig- Auxiliary/Triple-Voltage Monitoring nificantly improve system reliability and reduce size com- (0.62V internal reference) pared to separate ICs or discrete components. Watchdog Timer Option These devices monitor primary supply voltages (V 1) from CC 35s (min) Long Startup Period 1.8V to 5.0V and secondary supply voltages (V 2) from CC 1.12s (min) Normal Timeout Period 0.9V to 3.3V with factory-trimmed reset threshold voltage options (see Reset Voltage Threshold Suffix Guide). An Manual Reset Input Option externally adjustable RSTIN input option allows customers to Power-Fail Input/Power-Fail Output Option monitor a third supply voltage down to 0.62V. These devices (Push-Pull and Open-Drain Active-Low) are guaranteed to be in the correct reset output logic state when either V 1 or V 2 remains greater than 0.8V. CC CC Guaranteed Reset Valid Down to V 1 or CC A variety of push-pull or open-drain reset outputs along with V 2 = 0.8V CC watchdog input, manual reset input, and power-fail input/out- Reset Output Logic Options put features are available (see Selector Guide). Select reset Immune to Short V Transients timeout periods from 1.1ms to 1120ms (min) (see Reset CC Timeout Period Suffix Guide). The MAX6715MAX6729 are Low Supply Current 14A (typ) at 3.6V available in small 5, 6, and 8-pin SOT23 packages and oper- Small 5, 6, and 8-Pin SOT23 Packages ate over the -40C to +85C temperature range. Applications Ordering Information Multivoltage Systems PART TEMP RANGE PIN-PACKAGE Telecom/Networking Equipment MAX6715UT D -T -40C to +85C 6 SOT23-6 Computers/Servers MAX6716UT D -T -40C to +85C 6 SOT23-6 Portable/Battery-Operated Equipment MAX6717 UK D -T -40C to +85C 5 SOT23-5 Industrial Equipment MAX6718 UK D -T -40C to +85C 5 SOT23-5 Printer/Fax MAX6719 UT D -T -40C to +85C 6 SOT23-6 MAX6720UT D -T -40C to +85C 6 SOT23-6 Set-Top Boxes Note: The first are placeholders for the threshold voltage Typical Operating Circuit levels of the devices. Desired threshold levels are set by the part number suffix found in the Reset Voltage Threshold Suffix Guide. The after the D is a placeholder for the reset timeout delay time. Desired delay time is set using the timeout period suffix OUT2 DC/DC UNREGULATED found in the Reset Timeout Period Suffix Guide. For example the IN CONVERTER DC OUT1 MAX6716UTLTD3-T is a dual-voltage supervisor V 1 = 4.625V, 1.8V 0.9V TH V 2 = 3.075V, and 210ms (typ) timeout period. TH V1V 2 I/O CORE CC CC SUPPLY SUPPLY Devices are available in both leaded and lead-free packaging. R1 Specify lead-free by replacing- with+ when ordering. RST RESET P RSTIN/PFI I/O WDI MR PFO NMI R2 MAX67 Ordering Information continued at end of data sheet. PUSHBUTTON SWITCH Pin Configurations and 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/Triple Ultra-Low-Voltage SOT23 P Supervisory Circuits ABSOLUTE MAXIMUM RATINGS Terminal Voltage (with respect to GND) Continuous Power Dissipation (T = +70C) A V 1, V 2 ..........................................................-0.3V to +6V 5-Pin SOT23-5 (derate 7.1mW/C above +70C) ........571mW CC CC Open-Drain RST, RST1, RST2, PFO, RST ................-0.3V to +6V 6-Pin SOT23-6 (derate 8.7mW/C above +70C) ........696mW 8-Pin SOT23-8 (derate 8.9mW/C above +70C) ........714mW Push-Pull RST, RST1, PFO, RST...............-0.3V to (V 1 + 0.3V) CC Operating Temperature Range ...........................-40C to +85C Push-Pull RST2.........................................-0.3V to (V 2 + 0.3V) CC Storage Temperature Range .............................-65C to +150C RSTIN, PFI, MR, WDI................................................-0.3V to +6V Junction Temperature......................................................+150C Input Current/Output Current (all pins) ...............................20mA 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 1 = V 2 = 0.8V to 5.5V, GND = 0, T = -40C to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 1) CC CC A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage V 0.8 5.5 V CC V 1 < 5.5V, all I/O pins open 15 39 CC I CC1 V 1 < 3.6V, all I/O pins open 10 28 CC Supply Current A V 2 < 3.6V, all I/O pins open 4 11 CC I CC2 V 2 < 2.75V, all I/O pins open 3 9 CC 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 R (falling) 2.550 2.625 2.700 V CC TH1 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 T (falling) 3.000 3.075 3.150 S (falling) 2.850 2.925 3.000 R (falling) 2.550 2.625 2.700 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 2 Reset Threshold V V (falling) 1.530 1.575 1.620 V CC TH2 I (falling) 1.350 1.388 1.425 H (falling) 1.275 1.313 1.350 G (falling) 1.080 1.110 1.140 F (falling) 1.020 1.050 1.080 E (falling) 0.810 0.833 0.855 D (falling) 0.765 0.788 0.810 Reset Threshold Tempco 20 ppm/C Reset Threshold Hysteresis V Referenced to V typical 0.5 % HYST TH 2 MAX6715MAX6729