19-4411; Rev 0; 1/09 Ultra-Small, Hex Voltage, Microprocessor Supervisor The MAX16055 precision hex voltage microprocessor (µP) supervisory circuit monitors up to six system-supply voltages and asserts a single reset when any one supply voltage drops below its preset threshold. The device significantly reduces system size and component count while improving reliability compared to multiple ICs or discrete components. A variety of factory-trimmed threshold voltages are available to accommodate different supply voltages and tolerance with minimal external components. The MAX16055 includes internally fixed threshold options for monitoring 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, and 0.9V supplies with -5% or -10% tolerance. The MAX16055 is also available with one to five adjustable threshold inputs to monitor voltages down to 0.5V. A single active-low, open-drain output asserts when any monitored input falls below its associated threshold. The reset output features a weak internal pullup (typically 70µA) to supply input IN1. The reset output remains low for the reset timeout period (140ms, min) after all voltages rise above the selected thresholds. The reset output remains valid as long as either IN1 or IN2 input voltage is above 1V. The MAX16055 is available in a small 10-pin µMAX® (3mm x 3mm) package. The MAX16055 operates over the -40°C to +125°C automotive temperature range. Features o Precision Factory-Set Reset Threshold Options 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, and 0.9V o Adjustable Voltage Threshold Monitors Down to 0.5V with 1.5% Accuracy o Open-Drain RESET Output with 70µA Internal Pullup o Fixed 140ms (min) Reset Timeout Period o Manual Reset Input o Reset Valid for IN1 ≥ 1V or IN2 ≥ 1V o Tolerance Select (5%/10%) Input o Immune to Short Supply Transients Ordering Information PART TEMP RANGE PIN-PACKAGE MAX16055_AUB+* -40°C to +125°C 10 µMAX +Denotes a lead(Pb)-free/RoHS-compliant package. *Insert the desired threshold option letter from the Selector Guide into the blank to complete the part number. Contact factory for availability. Applications Telecommunications Networking Equipment High-End Printers Industrial Equipment Desktop and Notebook Computers Set-Top Boxes Typical Operating Circuit Servers/Workstations Data Storage Equipment MAX16055 µMAX is a registered trademark of Maxim Integrated Products, Inc. 10kΩ IN1 Pin Configuration 0.1µF MONITORED SUPPLIES TOP VIEW IN1 1 IN2 2 IN3 3 IN4 IN5 + 10 GND 9 RESET 8 MR 4 7 TOL 5 6 IN6 MAX16055 VCC µP RESET IN2 IN3 IN4 IN5 IN6 MR GND TOL µMAX ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX16055 General Description MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor ABSOLUTE MAXIMUM RATINGS RESET, TOL, MR, IN_ to GND ..................................-0.3V to +6V Input/Output Current (all pins) ............................................20mA Continuous Power Dissipation (TA = +70°C) 10-Pin µMAX (derate 5.6mW/°C above +70°C) ...........444mW Operating Temperature Range .........................-40°C to +125°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 (VIN1 = 1V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25°C.) (Note 1) PARAMETER Operating Voltage Range Input Current (Note 3) SYMBOL VIN1 IIN_ CONDITIONS (Note 2) 2 VTH TYP 1.0 MAX UNIT 5.5 V VIN_ = nominal input voltage (for IN2–IN6; 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, 0.9V supplies) 25 40 VIN1 = nominal input voltage (for +3.3V IN1 supply) 55 115 VIN_ = 0 to 0.5V or VADJ (for adjustable thresholds) Threshold Voltage MIN VIN_ decreasing -0.1 µA +0.1 3.3V, TOL = GND 3.00 3.08 3.15 3.3V, TOL = VIN1 2.85 2.93 3.00 3.0V, TOL = GND 2.70 2.78 2.85 3.0V , TOL = VIN1 2.55 2.63 2.70 2.5V, TOL = GND 2.25 2.32 2.38 2.5V, TOL = VIN1 2.13 2.19 2.25 1.8V, TOL = GND 1.62 1.67 1.71 1.8V, TOL = VIN1 1.53 1.58 1.62 1.5V, TOL = GND 1.355 1.389 1.425 1.5V, TOL = VIN1 1.283 1.316 1.350 1.2V, TOL = GND 1.084 1.112 1.140 1.2V, TOL = VIN1 1.027 1.053 1.08 1.1V, TOL = GND 0.993 1.019 1.045 1.1V, TOL = VIN1 0.941 0.965 0.99 1.0V, TOL = GND 0.903 0.926 0.95 1.0V, TOL = VIN1 0.856 0.878 0.90 0.9V , TOL = GND 0.813 0.834 0.855 0.9V, TOL = VIN1 0.770 0.790 0.810 _______________________________________________________________________________________ V Ultra-Small, Hex Voltage, Microprocessor Supervisor (VIN1 = 1V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25°C.) (Note 1) PARAMETER Adjustable Threshold Reset Threshold Hysteresis SYMBOL VTH VHYST CONDITIONS VIN_ decreasing MIN tRD Reset Timeout Period tRP 0.491 0.5 0.506 TOL = VCC 0.465 0.472 0.479 VIN_ increasing relative to VIN_ decreasing VIN_ falling at 10mV/µs from (VTH + 50mV) to (VTH - 50mV) 140 VOL 60 ppm/°C 20 µs 200 0.4 RESET Output High Source Current IOH VIN1 > 2.55V, RESET not asserted 0.8 x VIN1 VIL MR, TOL Input Voltage High VIH MR Minimum Pulse Width 70 100 nA 0.3 x VIN1 V V 1 µs 100 MR-to-RESET Delay 200 Note 1: Note 2: Note 3: Note 4: µA 0.7 x VIN1 MR Glitch Rejection MR Pullup Resistance V V TOL = IN1 MR, TOL Input Voltage Low ms 0.3 0.3 VIN1 > 2.55V, ISOURCE = 6µA (min), RESET not asserted TOL Input Current 280 VIN1 = 1.0V, ISINK = 50µA VOH V %VTH VIN1 = 2.5V, ISINK = 1.2mA RESET Output High UNIT 0.3 VIN1 = 5V, ISINK = 2mA RESET Output Low (Note 4) MAX TOL = GND Reset Threshold Temperature Coefficient IN_ to Reset Delay TYP 10 20 ns ns 33 kΩ 100% production tested at TA = +25°C. Limits over temperature guaranteed by design. The devices are powered from IN1. Monitored IN1 voltage is also the device power supply. RESET output is guaranteed to be in the correct state for IN1 or IN2 falling down to 1V. _______________________________________________________________________________________ 3 MAX16055 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VIN1 = 3.3V, TA = +25°C, unless otherwise noted.) NORMALIZED THRESHOLD ERROR vs. TEMPERATURE IN1 INPUT CURRENT (µA) 60 50 40 30 20 10 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 TEMPERATURE (°C) IN1 VOLTAGE (V) -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) MAXIMUM IN_ TRANSIENT DURATION vs. RESET THRESHOLD OVERDRIVE RESET PROPAGATION DELAY vs. RESET THRESHOLD OVERDRIVE (IN_ DECREASING) RESET PULLUP AND PULLDOWN RESPONSE (CL = 47pF) 70 60 50 RESET ASSERTS ABOVE THIS LINE 40 30 20 100 90 10 MAX16055 toc06 MAX16055 toc05 MAX16055 toc04 80 80 IN_ 100mV/div AC-COUPLED 70 60 50 40 RESET 2V/div 30 20 10 0 0 0 100 200 300 400 500 600 700 800 900 1000 0 100 200 300 400 500 600 700 800 900 1000 IN_ OVERDRIVE (mV) MR-TO-RESET PROPAGATION DELAY vs. TEMPERATURE 204 202 200 198 196 194 MAX16055 toc08 210 200 190 MR-TO-RESET DELAY (ns) RESET THRESHOLD (ms) 206 VIN_ = 3.3V MAX16055 toc07 210 208 20µs/div IN_ OVERDRIVE (mV) RESET TIMEOUT PERIOD vs. TEMPERATURE 180 170 160 150 140 130 120 192 110 190 100 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) 4 MAX16055 toc03 MAX16055 toc02 70 1.0 NORMALIZED THRESHOLD ERROR (%) 80 MAX16055 toc01 70 68 66 64 62 60 58 56 54 52 50 48 46 44 42 40 IN1 INPUT CURRENT vs. IN1 VOLTAGE RESET PROPAGATION DELAY (µs) IN1 INPUT CURRENT (µA) IN1 INPUT CURRENT vs. TEMPERATURE MAXIMUM IN_ TRANSIENT DURATION (µs) MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor VIN_ = 3.3V -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) _______________________________________________________________________________________ Ultra-Small, Hex Voltage, Microprocessor Supervisor RESET TIMEOUT DELAY MR-TO-RESET PROPAGATION DELAY MAX16055 toc09 MAX16055 toc10 VIN = 3.3V IN_ 1V/div MR 2V/div RESET 1V/div RESET 2V/div 40ms/div 40ns/div Pin Description PIN NAME FUNCTION 1 IN1 Voltage Input 1. IN1 is the power-supply input and voltage monitoring input for the device. Connect a 0.1µF bypass capacitor from IN1 to GND. Keep IN1 or IN2 > 1V to ensure RESET is valid. 2 IN2 Voltage Input 2. See the Selector Guide for voltage threshold. Keep IN1 or IN2 > 1V to ensure RESET is valid. 3 IN3 Voltage Input 3. See the Selector Guide for voltage threshold. 4 IN4 Voltage Input 4. See the Selector Guide for voltage threshold. 5 IN5 Voltage Input 5. See the Selector Guide for voltage threshold. 6 IN6 Voltage Input 6. See the Selector Guide for voltage threshold. 7 TOL Threshold Tolerance Input. Connect TOL to GND to select thresholds 5% below nominal. Connect TOL to IN1 to select thresholds 10% below nominal. 8 MR Active-Low Manual-Reset Input. When MR is low, RESET goes low and remains asserted for the reset timeout period after MR is pulled high. MR is internally pulled high by a 20kΩ pullup resistor to IN1. 9 RESET Active-Low Reset Output. RESET goes low when any input (IN_) goes below the specified threshold. After all inputs rise above the specified threshold voltages, RESET remains low for 140ms (min) before going high. The open-drain RESET output features a weak (70µA) internal pullup to IN1. 10 GND Ground _______________________________________________________________________________________ 5 MAX16055 Typical Operating Characteristics (continued) (VIN1 = 3.3V, TA = +25°C, unless otherwise noted.) MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor ALL DEVICES ARE POWERED FROM IN1 (3.3V/2.5V); RESET IS VALID IF VIN1 OR VIN2 IS GREATER THAN 1V IN1 3.3V IN2 ADJ IN1 IN2 PULLUP 70µA IN3 ADJ TIMEOUT (200ms) RESET IN4 1.8V UVLO IN5 ADJ IN6 ADJ IN1 TOL REF MAX16055C MR Figure 1. Functional Diagram Detailed Description The MAX16055 hex voltage µP supervisory circuit maintains system integrity in multisupply systems (Figure 1). The MAX16055 offers accurate, factory-fixed undervoltage threshold options for monitoring very low voltages. The MAX16055 also offers one to five adjustable thresholds for monitoring voltages down to 0.5V. See the Selector Guide for the available threshold options. 6 The MAX16055 includes an accurate voltage reference, precision comparators, and a series of accurate internal resistor-divider networks to set the factory-fixed reset threshold options for monitoring 3.3V, 3.0V, 2.5V, 1.8V, 1.5V, 1.2V, 1.1V, 1.0V, or 0.9V supplies. The resistor networks scale the specified IN_ threshold voltages to match the internal reference voltage. Adjustable threshold options allow the monitored voltage to be connected to the input of the internal comparator. Use an external voltage-divider to set the threshold voltage. _______________________________________________________________________________________ Ultra-Small, Hex Voltage, Microprocessor Supervisor Reset Output The MAX16055 RESET output asserts low when any monitored IN_ voltage drops below the specified reset threshold. RESET remains low for the reset timeout period of 140ms (min) after all inputs rise above the respective thresholds (Figure 2). The RESET output is open drain with a weak internal pullup to the monitored IN1 supply (70µA typ). For many applications, no external pullup resistor is required to interface with other logic devices. Apply an external pullup resistor to any voltage from 0 to 5.5V when interfacing to different logic-supply voltages (Figure 3). Internal circuitry prevents reverse current flow from the external pullup voltage into the RESET output when RESET is not asserted. RESET asserts low upon power-up. After all IN_ inputs rise above the respective threshold voltages, RESET remains low for the reset timeout period (Figure 4) before going high. IN1 powers the MAX16055 and is also a monitored voltage. When any monitored supply drops below the threshold voltage, RESET asserts low and remains low while either IN1 or IN2 is above 1.0V. Adjustable Thresholds The MAX16055 includes monitor options with adjustable reset thresholds. The threshold voltage at each adjustable IN_ input is typically 0.5V. To monitor a voltage higher than 0.5V, connect a resistor-divider network to the circuit as shown in Figure 5: VINTH = 0.5V x (R1 + R2)/R2 Therefore: R1 = R2 ((VINTH/0.5V) - 1) Use high valued resistors (~ 100kΩ) to minimize current through the external resistors. Use lower valued resistors for greater accuracy. The MAX16055 includes 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. +5V +3.3V IN_ VTH_ + VHYST VTH_ VCC IN1 10kΩ RESET RESET RESET µP 90% 10% MAX16055 tRD tRP GND Figure 2. RESET Output Timing Diagram GND Figure 3. Interfacing with External Logic-Supply Voltage _______________________________________________________________________________________ 7 MAX16055 The MAX16055 is immune to short IN_ transients. Each of the internal comparators provides a typical hysteresis of 0.3% with respect to the reset threshold. This built-in hysteresis improves the monitor’s immunity to ambient noise without significantly reducing threshold accuracy. See the Typical Operating Characteristics for a glitch immunity graph labeled Maximum IN_ Transient Duration vs. Reset Threshold Overdrive. MAX16055 Ultra-Small, Hex Voltage, Microprocessor Supervisor VINTH VIN1 VIN2 VTH + VHYST MAX16055 R1 VIN3 VIN4 VIN5 R2 VIN6 VTH tRP RESET tRP BEGINS WHEN THE LAST SUPPLY EXCEEDS ITS VTH + VHYST Figure 4. RESET Output with Various Input Voltages R1 = R2 ( VVINTH -1) TH Figure 5. Setting the Adjustable Threshold Manual-Reset Input (MR) Applications Information Many µP-based products require manual-reset capability. A logic-low on MR asserts RESET low. RESET remains asserted while MR is low, and during the reset timeout period (140ms, min) after MR returns high. The MR input has an internal 20kΩ pullup resistor to IN1. Connect a normally open momentary switch from MR to GND to create a manual-reset function. Connect a 0.1µF capacitor from MR to GND to provide additional noise immunity when driving MR from long cables or when the device is used in a noisy environment. Connect unused monitor inputs to a supply voltage higher than the specified threshold voltage. Connect a 100kΩ resistor between an unused adjustable input and IN1 to limit the bias current. Use IN1 for normal operation (device power supply). Do not connect unused monitor inputs to ground. Do not leave unused monitor inputs unconnected. Tolerance (TOL) The MAX16055 features an adjustable threshold tolerance. Connect TOL to GND to set the threshold voltages 5% below the nominal value. Connect TOL to IN1 to set the threshold voltages 10% below the nominal value. See the Electrical Characteristics table. Do not leave TOL unconnected. Unused Inputs Reset Output Pullup Resistor When connecting a pullup resistor from RESET to a voltage rail lower than the voltage on IN1, the internal 70µA pullup current flows through the pullup resistor, causing the voltage at RESET to be higher than the voltage rail when RESET is deasserted. Ensure that the value of the pullup resistor is low enough that the voltage rise does not cause problems. Power-Supply Bypassing and Grounding IN1 powers the MAX16055. Connect a 0.1µF bypass capacitor from IN1 to ground. All monitored inputs are immune to short supply transients. Add bypass capacitors from IN2–IN6 to GND to improve noise immunity. 8 _______________________________________________________________________________________ Ultra-Small, Hex Voltage, Microprocessor Supervisor PART* (SUFFIX IN BOLD) NOMINAL INPUT VOLTAGE (V) IN1 IN2 IN3 IN4 IN5 IN6 MAX16055A 3.3 2.5 1.5 1.8 1.2 0.9 MAX16055B 3.3 3.0 1.8 1.5 1.1 1.0 MAX16055C 3.3 ADJ ADJ 1.8 ADJ ADJ MAX16055D 3.3 ADJ 1.5 ADJ ADJ ADJ MAX16055E 3.3 2.5 ADJ 1.8 ADJ ADJ MAX16055F 3.3 2.5 1.5 ADJ ADJ ADJ MAX16055G 3.3 2.5 ADJ ADJ ADJ ADJ MAX16055H 3.3 ADJ ADJ ADJ ADJ ADJ MAX16055I 2.5 ADJ ADJ ADJ ADJ ADJ MAX16055J 3.3 3.3 2.5 1.2 1.5 1.2 *Adjustable voltage is based on the 0.5V internal threshold. External threshold voltage can be set using an external resistor-divider. (VADJ = 0.500V typ). Package Information Chip Information PROCESS: BiCMOS For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 10 µMAX U10+2 21-0061 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 © 2009 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX16055 Selector Guide