MAX670108/MAX6701A03A/05A07A 19-1952 Rev 3 12/05 Low-Voltage, SOT23 P Supervisors with Power- Fail In/Out, Manual Reset, and Watchdog Timer General Description Features Small 8-Pin SOT23 Package The MAX6701MAX6708 microprocessor (P) supervisory circuits reduce the complexity and components required Precision Monitoring of +5.0V, +3.3V, +3.0V, +2.5V to monitor power-supply functions in P systems. These Supply Voltages devices significantly improve system reliability and accu- 140ms Reset Timeout Delay racy compared to separate ICs or discrete components. Power-Fail Input with Independent Output The MAX6701MAX6708 family provides four functions: Monitor Inputs Down to 0.62V (MAX6704MAX6708) a reset output during power-up, power-down, and Dual Adjustable Reset Input for Triple-Voltage brownout conditions an independent watchdog output Monitoring (MAX6701(A)/MAX6702(A)/MAX6703(A)) that goes low if the watchdog input has not been toggled 1.6s Watchdog Timeout Period within 1.6s a 0.62V threshold detector for power-fail (MAX6701(A)MAX6707(A)) warning and an active-low manual reset input. Independent Watchdog Output The MAX6701MAX6708 family offers several pinout (MAX6701(A)/MAX6702(A)/MAX6703(A)/ options to accommodate a variety of multivoltage micro- MAX6705(A)/MAX6706(A)/MAX6707(A)) processor supervision applications. Manual Reset Input The MAX6701(A)/MAX6702(A)/MAX6703(A) monitor Four Reset Output Stage Options three supply voltages (one fixed threshold and two Active Low Push-Pull (MAX6701(A), MAX6705(A)) adjustable) to drive a single reset output and include a Active Low Open Drain (MAX6703(A), MAX6707(A)) manual reset input and a watchdog timer with an inde- Active High Push-Pull (MAX6702(A), MAX6706(A)) pendent output. The MAX6704 monitors a single-supply Dual Active Low/High Push-Pull (MAX6704, voltage to drive complementary reset outputs and MAX6708) includes an independent adjustable power-fail-in/power- Guaranteed Reset Valid to V = 1V CC fail-out comparator, a manual reset input, and a reset- Immune to Short Falling V Transients CC based watchdog timer. The MAX6705(A)/MAX6706(A)/ Low Cost, Few External Components MAX6707(A) monitor a single-supply voltage to drive a single reset output and include an independent Ordering Information adjustable power-fail-in/power-fail-out comparator, a manual reset input, and a watchdog timer with an inde- PART TEMP RANGE PIN-PACKAGE pendent output. The MAX6708 is the same as the MAX6701 KA-T -40C to +125C 8 SOT23-8 MAX6704 but without the watchdog timer function. MAX6701A KA-T -40C to +125C 8 SOT23-8 See the Detailed Description for differences between Insert the desired suffix letter (from the Threshold Suffix Guide non-A and A versions. table) into the blank to complete the part number. All devices must be ordered in increments of 2500 pieces. Sample stock is typically held on standard versions only. Contact factory for availability. Applications Devices are available in both leaded and lead-free packaging. Computers Specify lead-free by replacing -T with +T when ordering. Controllers Ordering Information continued at end of data sheet. Intelligent Instruments Pin Configurations Automotive Systems TOP VIEW Critical P Power Monitoring MR 1 8 WDO White Goods V 2 7 RESET (RESET) CC Networking MAX6701(A) MAX6702(A) GND 3 6 WDI Telecommunications MAX6703(A) RST IN1 4 5 RST IN2 Typical Operating Circuit and Selector Guide appear at end SOT23 ( ) ARE FOR MAX6702(A) ONLY. of data sheet. Pin Configurations continued 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.Low-Voltage, SOT23 P Supervisors with Power- Fail In/Out, Manual Reset, and Watchdog Timer ABSOLUTE MAXIMUM RATINGS V ........................................................................-0.3V to +6.0V Continuous Power Dissipation (T = +70C) CC A Open-Drain RESET, WDO, PFO ...........................-0.3V to +6.0V 8-Pin SOT23 (derate 8.9mW/C above +70C)............714mW Push-Pull RESET, RESET, WDO, PFO........-0.3V to (V + 0.3V) Operating Temperature Range .........................-40C to +125C CC MR, WDI, PFI, RST IN1, RST IN2 ..............-0.3V to (V + 0.3V) Junction Temperature......................................................+150C CC Input Current (V ).............................................................20mA Storage Temperature Range .............................-65C to +150C CC Output Current (RESET, RESET, PFO, WDO) .....................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 = +4.25V to +5.5V for L/M versions, V = +2.55V to +3.6V for the T/S/R versions, V = +2.1V to +2.75V for the Z/Y versions. CC CC CC T = -40C to +125C, unless otherwise specified. Typical values are at T = +25C.) (Note 1) A A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS T = 0C to +125C 1.0 5.5 A Operating Voltage Range V V CC T = -40C to +125C 1.2 5.5 A V < 5.5V, no load 12 25 CC Supply Current I V < 3.6V, no load 9 20 A CC CC MR Unconnected V < 3.6V, no load (MAX6708 only) 6 20 CC T = -40C to +85C 4.50 4.63 4.75 A MAX670 L/MAX670 AL T = -40C to +125C 4.47 4.78 A T = -40C to +85C 4.25 4.38 4.50 A M AX 670 M /M AX 670 AM T = -40C to +125C 4.22 4.53 A T = -40C to +85C 3.00 3.08 3.15 A MAX670 T/MAX670 AT T = -40C to +125C 2.97 3.17 A T = -40C to +85C 2.85 2.93 3.00 A V Reset Threshold CC MAX670 S/MAX670 AS V V TH (V falling) CC T = -40C to +125C 2.83 3.02 A T = -40C to +85C 2.55 2.63 2.70 A MAX670 R/MAX670 AR T = -40C to +125C 2.53 2.72 A T = -40C to +85C 2.25 2.32 2.38 A MAX670 Z/MAX670 AZ T = -40C to +125C 2.24 2.40 A T = -40C to +85C 2.12 2.19 2.25 A MAX670 Y/MAX670 AY T = -40C to +125C 2.11 2.27 A Reset Threshold V 60 ppm/C TH Temperature Coefficient V to Reset Output Delay V falling at 10mV/s 12 s CC CC T = -40C to +85C 140 200 280 A Reset Timeout Period t ms RP T = -40C to +125C 120 300 A M AX6701( A) /M AX 6 702(A) /M AX 67 03(A) /M AX670 5(A) / V Falling to WDO Delay 5s CC M AX 6706(A) /M AX 6 707(A) T = -40C to +85C 602 618 634 PFI, RST IN1, RST IN2 A V = 1.8V to 5.5V mV C C Threshold T = -40C to +125C 593 642 A PFI Hysteresis 6mV 2 MAX670108/MAX6701A03A/05A07A