19-2324; Rev 1; 4/02 Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package Features ♦ Monitor Up to Four Power-Supply Voltages ♦ Precision Factory-Set Reset Threshold Options for 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V Supplies ♦ Adjustable Voltage Threshold Monitors Down to 0.62V with 1.5% Accuracy ♦ Low 35µA Supply Current ♦ Open-Drain RESET Output with 10µA Internal Pullup ♦ 5µs Propagation Delay (MAX6700) ♦ 140ms (min) Reset Timeout Period (MAX6710) ♦ RESET Valid to IN1 = 1V or IN2 = 1V ♦ Immune to Short Monitored Supply Transients ♦ Guaranteed from -40°C to +85°C ♦ Small 6-Pin SOT23 Package Ordering Information TEMP RANGE PIN-PACKAGE MAX6700UT-T PART -40°C to +85°C 6 SOT23-6 MAX6710_UT-T -40°C to +85°C 6 SOT23-6 Insert the desired suffix letter from the Selector Guide into the blank to complete the part number. There is a 2500 piece minimum order increment requirement on the SOT package. These devices are available in tape-and-reel only. ________________________Applications Telecommunications Typical Operating Circuit High-End Printers Desktop and Notebook Computers Data Storage Equipment Networking Equipment Industrial Equipment Set-Top Boxes Servers/Workstations Selector Guide with Top marks appears at end of data sheet. IN1 SUPPLIES TO BE MONITORED MAX6700 MAX6710 IN2 RESET µP IN3 IN4 GND Pin Configuration appears at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX6700/MAX6710 General Description The MAX6700/MAX6710 precision triple/quad voltage microprocessor (µP) supervisory circuits monitor up to four system-supply voltages and assert a single reset if any supply voltage drops below its preset threshold. These devices significantly reduce system size and component count while improving reliability compared to separate ICs or discrete components. A variety of factory-trimmed threshold voltages are available to accommodate different supply voltages and tolerances with minimal external component requirements. The MAX6710 includes internally fixed options for monitoring 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies with -5% or -10% tolerances. The MAX6710 is also available with one to three adjustable threshold options to monitor voltages down to 0.62V. The MAX6700 monitors three voltages with adjustable thresholds down to 0.62V. A single active-low output asserts when any monitored input falls below its associated threshold. The open-drain output has a weak internal pullup (10µA) to IN2. For the MAX6710, reset remains low for the reset timeout period (140ms min) after all voltages rise above the selected threshold. The MAX6700 acts as a voltage detector with a propagation delay of 5µs after all monitored voltages exceed their thresholds. The output remains valid as long as either IN2 or IN2 input voltage remains above 1V (MAX6710) or VCC is above 2V (MAX6700/MAX6710Q). The MAX6700/MAX6710 are available in a small 6-pin SOT23 package and operate over the extended (-40°C to +85°C) temperature range. MAX6700/MAX6710 Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package ABSOLUTE MAXIMUM RATINGS VCC, IN_, RESET to GND..........................................-0.3V to +6V Continuous RESET Current .................................................20mA Continuous Power Dissipation 6-Pin SOT23 (derate 8.7mW/°C above +70°C).........695.7mW Operating Temperature Range ...........................-40°C to +85°C Storage Temperature Range .............................-65°C to +150°C Junction Temperature ......................................................+150°C Lead Temperature (soldering, 10s) .................................+300°C 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 (VIN2 = 1V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN2 = 3.0V to 3.3V, TA = +25°C.) (Note 1) PARAMETER Operating Voltage Range (Note 2) Input Current SYMBOL VCC VIN2 IIN_ ICC Threshold Voltage Adjustable Threshold 2 VTH VTH Reset Threshold Hysteresis VHYST Reset Threshold Temperature Coefficient TCVTH CONDITIONS MAX6700/MAX6710Q All others (Note 3) MIN TYP 2.0 MAX 5.5 TA = 0oC to +85oC 1.0 5.5 TA = -40oC to +85oC 1.2 5.5 IN_ = nominal input voltage (for 1.8V, 2.5V, and 5.0V supplies) 25 40 IN2 = nominal input voltage (for 3.0V and 3.3V supplies) (Note 4) 55 115 0.4 VIN3, VIN4 = 0 to 0.85V (for adjustable thresholds) 0.2 MAX6700/MAX6710Q only, VCC = 5.5V 35 50 5V (-5%) 4.50 4.63 4.75 5V (-10%) 4.25 4.38 4.50 3.3V (-5%) 3.00 3.08 3.15 3.3V (-10%) 2.85 2.93 3.00 3.0V (-5%) 2.70 2.78 2.85 3.0V (-10%) 2.55 2.63 2.70 2.5V (-5%) 2.25 2.32 2.38 2.5V (-10%) 2.13 2.19 2.25 1.8V (-5%) 1.62 1.67 1.71 1.8V (-10%) 1.53 1.58 1.62 0.611 0.620 0.629 IN_ decreasing V µA VIN1 = 0 to 0.85V (for adjustable thresholds) IN_ decreasing UNITS IN_ increasing relative to IN_ decreasing V 0.3 %VTH 60 ppm/oC µs IN_ to Reset Delay tRD VIN falling at 10mV/µs from VTH to (VTH - 50mV) 30 Propagation Delay tPD MAX6700 only 5 Reset Timeout Period tRP MAX6710 only 140 V 200 _______________________________________________________________________________________ µs 280 ms Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package MAX6700/MAX6710 ELECTRICAL CHARACTERISTICS (continued) (VIN2 = 1V to 5.5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN2 = 3.0V to 3.3V, TA = +25°C.) (Note 1) PARAMETER SYMBOL RESET Output Low VOL RESET Output High VOH RESET Output High Source Current Note 1: Note 2: Note 3: Note 4: CONDITIONS MIN TYP VIN2, VCC = 5V, ISINK = 2mA 0.3 VIN2, VCC = 2.5V, ISINK = 1.2mA 0.4 VIN2 = 1.0V, ISINK = 50µA, TA = 0oC to +85oC 0.3 VCC ≥ 2.0V, ISOURCE = 6µA, RESET deasserted (MAX6700/MAX6710Q) 0.8 ✕ VCC VIN2 ≥ 2.0V, ISOURCE = 6µA, RESET deasserted 0.8 ✕ VIN2 UNITS V V VIN2 ≥ 2.0V, RESET deasserted IOH MAX 10 µA 100% production tested at TA = +25°C. Limits over temperature guaranteed by design. The devices are powered from IN2 or VCC (for MAX6700/MAX6710Q). The RESET output is guaranteed to be in the correct state for IN1 or IN2 down to 1V. Monitored IN2 voltage (3.3V, 3.0V) is also the device power supply. Supply current splits as follows: 25µA for the resistor divider (for the monitored voltage) and 30µA for other circuits. Typical Operating Characteristics (VIN2 = VCC = 3.0V, TA = +25°C) VIN2 = 3.3V 52 50 48 VIN2 = 3V 46 70 60 50 40 30 44 20 42 10 40 0 -40 -15 10 35 TEMPERATURE (°C) 60 85 0.10 0.08 NORMALIZED THRESHOLD ERROR (%) 54 80 IN2 INPUT CURRENT (µA) 56 MAX6700 toc02 58 IN2 INPUT CURRENT (µA) 90 MAX6700 toc01 60 NORMALIZED THRESHOLD ERROR vs. TEMPERATURE IN2 INPUT CURRENT vs. IN2 VOLTAGE MAX6700 toc03 IN2 INPUT CURRENT vs. TEMPERATURE VIN2 = 3.3V 0.06 0.04 VTH = 1.8V 0.02 0 -0.02 -0.04 -0.06 -0.08 -0.10 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 IN2 VOLTAGE (V) -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 Typical Operating Characteristics (continued) (VIN2 = VCC = 3.0V, TA = +25°C) RESET DELAY vs. RESET THRESHOLD OVERDRIVE (IN_ DECREASING) MAXIMUM IN_ TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE 80 MAX6700 toc05 90 90 80 IN_ 100mV/div AC-COUPLED 70 RESET DELAY (µs) 70 RESET PULLUP AND PULLDOWN RESPONSE (CL = 47pF) MAX6700 toc06 100 MAX6700 toc04 MAXIMUM IN_ TRANSIENT DURATION (µs) 100 60 50 RESET ASSERTED ABOVE THIS LINE 40 30 60 50 40 RESET 2V/div 30 20 20 10 10 0 0 0 100 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV) 10µs/div 0 100 200 300 400 500 600 700 800 900 1000 RESET THRESHOLD OVERDRIVE (mV) RESET TIMEOUT DELAY vs. TEMPERATURE RESET TIMEOUT DELAY (ms) RESET TIMEOUT DELAY (MAX6710) RESET PROPAGATION DELAY (MAX6700) MAX6700 toc09 MAX6700 toc08 232 231 230 229 228 227 226 225 224 223 222 221 220 MAX6700 toc07 MAX6700/MAX6710 Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package -40 -15 10 35 60 85 IN_ 2V/div IN_ 2V/div RESET 2V/div RESET 2V/div 40ms/div 2µs/div TEMPERATURE (°C) Pin Description PIN 1 FUNCTION IN1 Input Voltage 1. See Selector Guide for monitored voltages. IN2 VCC Input Voltage 2. See Selector Guide for monitored voltages. IN2 is the power-supply input for the device. For the MAX6700/MAX6710Q, VCC is the power-supply input for the device and is not a monitored voltage. 3 IN3 Input Voltage 3. See Selector Guide for monitored voltages. 4 IN4 Input Voltage 4. See Selector Guide for monitored voltages. 5 GND 6 RESET 2 4 NAME Ground Active-Low, Reset Output. RESET goes low when any input goes below its specified threshold. After all inputs rise above their threshold voltage, RESET remains low for 5µs (MAX6700) or for 200ms (MAX6710) before going high. The open-drain RESET output has a weak (10µA) internal pullup to IN2 or VCC. _______________________________________________________________________________________ Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package MAX6700/MAX6710 VCC VCC IN1 MAX6700 VCC VCC IN3 RESET UVLO VCC IN4 0.62V REFERENCE Figure 1. MAX6700 Functional Diagram Detailed Description The MAX6700/MAX6710 are very small, low-power, triple/quad voltage µP supervisory circuits designed to maintain system integrity in multisupply systems (Figures 1 and 2). The MAX6710 offers several internally trimmed undervoltage threshold options for monitoring 5.0V, 3.3V, 3.0V, 2.5V, and 1.8V supplies. The MAX6700/MAX6710 offer one to three adjustable thresholds for monitoring voltages down to 0.62V. The triple/quad voltage monitors include an accurate bandgap reference, precision comparators, and a series of internally trimmed resistor-divider networks to set the factory-fixed reset threshold options. The resistor networks scale the specified IN_ reset voltages to match the internal bandgap reference/comparator voltage. Adjustable threshold options bypass the internal resistor networks and connect directly to one of the comparator inputs (use an external resistor-divider network for threshold matching). The MAX6700/MAX6710Q provide a separate unmonitored power-supply input (VCC) and three adjustable voltage inputs. Each of the internal comparators has a typical hysteresis of 0.3% with respect to its reset threshold. This built-in hysteresis improves the monitor’s immunity to ambient noise without significantly reducing threshold accuracy. The MAX6700/MAX6710 are immune to short IN_ transients. See Typical Operating Characteristics for a glitch immunity graph. _______________________________________________________________________________________ 5 MAX6700/MAX6710 Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package ALL DEVICES ARE POWERED FROM IN2, VCC (3.0V/3.3V). RESET IS VALID IF VIN1 OR VIN2 IS GREATER THAN 1V, OR IF VCC IS GREATER THAN 2V (MAX6710Q ONLY) IN1 (ADJ) MAX6710 IN2, VCC (3.3V/3V) IN2, VCC RESET TIMEOUT (200ms) NOR GATE IN3 (2.5V/1.8V) UVLO IN4 (ADJ) 0.62V REFERENCE Figure 2. MAX6710 Functional Diagram Applications Information Reset Output The MAX6700 RESET output asserts low when any monitored IN_ voltage drops below its specified reset threshold and remains low for the propagation delay (5µs) after all inputs exceed their thresholds (Figure 3). The MAX6710 provides an extended reset timeout period of 140ms (min). The output is open drain with a 6 weak internal pullup to the monitored IN2 or VCC supply (10µA typ). For many applications no external pullup resistor is required to interface with other logic devices. An external pullup resistor to any voltage from 0 to 5.5V can overdrive the internal pullup if interfacing to different logic-supply voltages (Figure 4). Internal circuitry prevents reverse current flow from the external pullup voltage to IN2. _______________________________________________________________________________________ Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package V CC powers the MAX6700/MAX6710Q and is not a monitored voltage. IN2 powers all other options for the MAX6710 and is a monitored voltage. When any supply drops below its threshold, the reset output asserts low and remains low while either IN1 or IN2 is above 1.0V. VTH_ Adjustable Thresholds RESET 90% 10% tRP tRD Figure 3. RESET Output Timing Diagram The MAX6700/MAX6710 offer several monitor options with adjustable reset thresholds. The threshold voltage at each adjustable IN_ input is typically 0.62V. To monitor a voltage >0.62V, connect a resistor-divider network to the circuit as shown in Figure 5. VINTH = 0.62V x (R1 + R2) / R2 or, solved in terms of R1: +5V IN2 = +3.3V 100kΩ IN2 VCC RESET RESET R1 = R2 ((VINTH / 0.62V) - 1) Because the MAX6700/MAX6710 have a guaranteed input current of ±0.2µA (±0.4µA for IN1) on their adjustable inputs, resistor values up to 100kΩ can be used for R2 with <1% error. The MAX6700/MAX6710Q include an internal voltage clamp (1.5V typ) at each of the adjustable voltage inputs. An input voltage higher than 1.5V induces a higher input current. Unused Inputs MAX6700 MAX6710 GND GND Figure 4. Interfacing to Different Logic-Supply Voltage Connect unused monitor inputs to a supply voltage greater in magnitude than their specified threshold voltages. For unused IN_ adjustable inputs, connect a 1MΩ series resistor between the unused input and IN2 (or VCC) to limit the bias current. Use IN2 for normal operation (device power-supply pin). Do not connect unused monitor inputs to ground or allow them to float. Adding Manual Reset Capability (MAX6710) VINTH Figure 6 shows an application circuit adding manual reset to the MAX6710. Depressing the pushbutton switch shortcircuits the analog input to ground and initiates a RESET pulse. The switch must be open for at least 140ms in order to deassert the RESET output. No external switch debounce is required. Use a small capacitor to improve noise immunity when using long leads from the pushbutton switch to the adjustable input. R1 R2 Power-Supply Bypassing and Grounding VREF = 0.62V R1 = R2 Figure 5. Setting the Auxiliary Monitor VINTH - 1) ( 0.62V The MAX6700/MAX6710 are normally powered from the monitored IN2 or from the VCC supply input. All monitored inputs are immune to short supply transients. For higher immunity in noisy applications, connect a 0.1µF bypass capacitor from the IN2 input to ground. Add capacitance to IN1, IN3, and IN4 to increase their noise immunity. _______________________________________________________________________________________ 7 MAX6700/MAX6710 IN_ VTH_ MAX6700/MAX6710 Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package Pin Configuration IN1 IN2 TOP VIEW MAX6710 IN3 IN1 1 6 RESET 5 GND 4 IN4 RESET R1 IN4 (ADJUSTABLE INPUT) (VCC) IN2 2 GND IN3 3 MAX6700 MAX6710 R2 SOT23 ( ) ARE FOR MAX6700/MAX6710Q ONLY Figure 6. Adding Manual Reset Capability Chip Information TRANSISTOR COUNT: 699 PROCESS: BiCMOS Selector Guide NOMINAL INPUT VOLTAGE PART** (SUFFIX IN BOLD) IN1 (V) IN2 (V) IN3 (V) IN4 (V) SUPPLY TOLERANCE (%) TOP MARK MAX6700UT Adj* VCC Adj* Adj* N/A ABEK MAX6710AUT 5 3.3 2.5 Adj* 10 AAZA MAX6710BUT 5 3.3 2.5 Adj* 5 AAZB MAX6710CUT 5 3.3 1.8 Adj* 10 AAZC MAX6710DUT 5 3.3 1.8 Adj* 5 AAZD AAZE MAX6710EUT Adj* 3.3 2.5 1.8 10 MAX6710FUT Adj* 3.3 2.5 1.8 5 AAZF MAX6710GUT 5 3.3 Adj* Adj* 10 AAZG MAX6710HUT 5 3.3 Adj* Adj* 5 AAZH MAX6710IUT Adj* 3.3 2.5 Adj* 10 AAZI MAX6710JUT Adj* 3.3 2.5 Adj* 5 AAZJ AAZK MAX6710KUT Adj* 3.3 1.8 Adj* 10 MAX6710LUT Adj* 3.3 1.8 Adj* 5 AAZL MAX6710MUT Adj* 3 2.5 Adj* 10 AAZM MAX6710NUT Adj* 3 2.5 Adj* 5 AAZN AAZO MAX6710OUT Adj* 3 1.8 Adj* 10 MAX6710PUT Adj* 3 1.8 Adj* 5 AAZP MAX6710QUT Adj* VCC Adj* Adj* N/A AAZQ *Adjustable voltage based on 0.62V internal threshold. External threshold voltage can be set using an external resistor-divider. **The MAX6700 acts as a voltage detector with a 5µs propagation delay. The MAX6710 serves as a microprocessor reset circuit with a 140ms (min) reset timeout. 8 _______________________________________________________________________________________ Low-Voltage, High-Accuracy, Triple/Quad Voltage µP Supervisory Circuits in SOT Package 6LSOT.EPS Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 9 © 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products. MAX6700/MAX6710 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.)