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19-4411; Rev 0; 1/09
Ultra-Small, Hex Voltage, Microprocessor Supervisor
General Description
The MAX16055 precision hex voltage microprocessor (P) 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 70A) 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 MAX(R) (3mm x 3mm) package. The MAX16055 operates over the -40C to +125C 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 70A 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
MAX16055
Ordering Information
PART MAX16055_AUB+* TEMP RANGE -40C to +125C PIN-PACKAGE 10 MAX
+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 High-End Printers Desktop and Notebook Computers Data Storage Equipment
MAX is a registered trademark of Maxim Integrated Products, Inc.
MAX16055
10k IN1 0.1F VCC P RESET IN2 IN3 IN4 IN5 IN6 MR GND TOL
Networking Equipment Industrial Equipment Set-Top Boxes Servers/Workstations
Typical Operating Circuit
Pin Configuration
TOP VIEW
IN1 1 IN2 IN3 IN4 IN5 2 3 4 5 MONITORED SUPPLIES
+
10 GND 9 RESET MR TOL IN6
MAX16055
8 7 6
MAX
________________________________________________________________ Maxim Integrated Products
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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.
Ultra-Small, Hex Voltage, Microprocessor Supervisor MAX16055
ABSOLUTE MAXIMUM RATINGS
RESET, TOL, MR, IN_ to GND ..................................-0.3V to +6V Input/Output Current (all pins) ............................................20mA Continuous Power Dissipation (TA = +70C) 10-Pin MAX (derate 5.6mW/C above +70C) ...........444mW Operating Temperature Range .........................-40C to +125C Storage Temperature Range .............................-65C to +150C Junction Temperature ......................................................+150C 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
(VIN1 = 1V to 5.5V, TA = -40C to +125C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25C.) (Note 1)
PARAMETER Operating Voltage Range SYMBOL VIN1 (Note 2) 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) Input Current (Note 3) IIN_ VIN1 = nominal input voltage (for +3.3V IN1 supply) VIN_ = 0 to 0.5V or VADJ (for adjustable thresholds) 3.3V, TOL = GND 3.3V, TOL = VIN1 3.0V, TOL = GND 3.0V , TOL = VIN1 2.5V, TOL = GND 2.5V, TOL = VIN1 1.8V, TOL = GND 1.8V, TOL = VIN1 Threshold Voltage VTH VIN_ decreasing 1.5V, TOL = GND 1.5V, TOL = VIN1 1.2V, TOL = GND 1.2V, TOL = VIN1 1.1V, TOL = GND 1.1V, TOL = VIN1 1.0V, TOL = GND 1.0V, TOL = VIN1 0.9V , TOL = GND 0.9V, TOL = VIN1 -0.1 3.00 2.85 2.70 2.55 2.25 2.13 1.62 1.53 1.355 1.283 1.084 1.027 0.993 0.941 0.903 0.856 0.813 0.770 3.08 2.93 2.78 2.63 2.32 2.19 1.67 1.58 1.389 1.316 1.112 1.053 1.019 0.965 0.926 0.878 0.834 0.790 CONDITIONS MIN 1.0 25 TYP MAX 5.5 40 A UNIT V
55
115 +0.1 3.15 3.00 2.85 2.70 2.38 2.25 1.71 1.62 1.425 1.350 1.140 1.08 1.045 0.99 0.95 0.90 0.855 0.810
V
2
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Ultra-Small, Hex Voltage, Microprocessor Supervisor
ELECTRICAL CHARACTERISTICS (continued)
(VIN1 = 1V to 5.5V, TA = -40C to +125C, unless otherwise noted. Typical values are at VIN1 = 3.3V, TA = +25C.) (Note 1)
PARAMETER Adjustable Threshold Reset Threshold Hysteresis Reset Threshold Temperature Coefficient IN_ to Reset Delay Reset Timeout Period RESET Output Low (Note 4) tRD tRP VIN1 = 5V, ISINK = 2mA VOL VIN1 = 2.5V, ISINK = 1.2mA VIN1 = 1.0V, ISINK = 50A RESET Output High RESET Output High Source Current TOL Input Current MR, TOL Input Voltage Low MR, TOL Input Voltage High MR Minimum Pulse Width MR Glitch Rejection MR-to-RESET Delay MR Pullup Resistance 10 VIL VIH 0.7 x VIN1 1 100 200 20 33 VOH IOH VIN1 > 2.55V, ISOURCE = 6A (min), RESET not asserted VIN1 > 2.55V, RESET not asserted TOL = IN1 0.8 x VIN1 70 100 0.3 x VIN1 VIN_ falling at 10mV/s from (VTH + 50mV) to (VTH - 50mV) 140 SYMBOL VTH VHYST CONDITIONS VIN_ decreasing TOL = GND TOL = VCC MIN 0.491 0.465 TYP 0.5 0.472 0.3 60 20 200 280 0.3 0.4 0.3 V A nA V V s ns ns k V MAX 0.506 0.479 UNIT V %VTH ppm/C s ms
MAX16055
VIN_ increasing relative to VIN_ decreasing
Note 1: Note 2: Note 3: Note 4:
100% production tested at TA = +25C. 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.
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Ultra-Small, Hex Voltage, Microprocessor Supervisor MAX16055
Typical Operating Characteristics
(VIN1 = 3.3V, TA = +25C, unless otherwise noted.)
IN1 INPUT CURRENT vs. TEMPERATURE
70 68 66 64 62 60 58 56 54 52 50 48 46 44 42 40 TEMPERATURE (C)
MAX16055 toc01
IN1 INPUT CURRENT vs. IN1 VOLTAGE
MAX16055 toc02
NORMALIZED THRESHOLD ERROR vs. TEMPERATURE
NORMALIZED THRESHOLD ERROR (%) 0.8 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0
MAX16055 toc03
80 70 IN1 INPUT CURRENT (A) 60 50 40 30 20 10 0
1.0
IN1 INPUT CURRENT (A)
-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 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
MAX16055 toc04
RESET PROPAGATION DELAY vs. RESET THRESHOLD OVERDRIVE (IN_ DECREASING)
90 RESET PROPAGATION DELAY (s) 80 70 60 50 40 30 20 10 0
MAX16055 toc05
RESET PULLUP AND PULLDOWN RESPONSE (CL = 47pF)
MAX16055 toc06
80 MAXIMUM IN_ TRANSIENT DURATION (s) 70 60 50 40 30 20 10 0 RESET ASSERTS ABOVE THIS LINE
100
IN_ 100mV/div AC-COUPLED
RESET 2V/div
0 100 200 300 400 500 600 700 800 900 1000 IN_ OVERDRIVE (mV)
0 100 200 300 400 500 600 700 800 900 1000 IN_ OVERDRIVE (mV)
20s/div
RESET TIMEOUT PERIOD vs. TEMPERATURE
MAX16055 toc07
MR-TO-RESET PROPAGATION DELAY vs. TEMPERATURE
200 190 MR-TO-RESET DELAY (ns) 180 170 160 150 140 130 120 110 100 VIN_ = 3.3V -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
MAX16055 toc08
210 208 206 RESET THRESHOLD (ms) 204 202 200 198 196 194 192 190 VIN_ = 3.3V
210
-40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
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Ultra-Small, Hex Voltage, Microprocessor Supervisor
Typical Operating Characteristics (continued)
(VIN1 = 3.3V, TA = +25C, unless otherwise noted.)
MAX16055
RESET TIMEOUT DELAY
MAX16055 toc09
MR-TO-RESET PROPAGATION DELAY
MAX16055 toc10
VIN = 3.3V IN_ 1V/div
MR 2V/div
RESET 1V/div
RESET 2V/div
40ms/div
40ns/div
Pin Description
PIN 1 2 3 4 5 6 7 8 NAME IN1 IN2 IN3 IN4 IN5 IN6 TOL MR FUNCTION Voltage Input 1. IN1 is the power-supply input and voltage monitoring input for the device. Connect a 0.1F bypass capacitor from IN1 to GND. Keep IN1 or IN2 > 1V to ensure RESET is valid. Voltage Input 2. See the Selector Guide for voltage threshold. Keep IN1 or IN2 > 1V to ensure RESET is valid. Voltage Input 3. See the Selector Guide for voltage threshold. Voltage Input 4. See the Selector Guide for voltage threshold. Voltage Input 5. See the Selector Guide for voltage threshold. Voltage Input 6. See the Selector Guide for voltage threshold. Threshold Tolerance Input. Connect TOL to GND to select thresholds 5% below nominal. Connect TOL to IN1 to select thresholds 10% below nominal. 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 20k pullup resistor to IN1. 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 (70A) internal pullup to IN1. Ground
9 10
RESET GND
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Ultra-Small, Hex Voltage, Microprocessor Supervisor MAX16055
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 IN2 PULLUP
IN1 70A
IN3 ADJ TIMEOUT (200ms) RESET
IN4 1.8V
IN5 ADJ
UVLO
IN6 ADJ
IN1
TOL MR
REF
MAX16055C
Figure 1. Functional Diagram
Detailed Description
The MAX16055 hex voltage P 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.
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.
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Ultra-Small, Hex Voltage, Microprocessor Supervisor
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. 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.
MAX16055
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 (~ 100k) 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.
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 (70A 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
+3.3V IN_ VTH_ VTH_ + VHYST IN1 10k RESET
+5V
VCC
RESET
RESET 90% 10%
P
MAX16055
tRD tRP GND GND
Figure 2. RESET Output Timing Diagram
Figure 3. Interfacing with External Logic-Supply Voltage
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Ultra-Small, Hex Voltage, Microprocessor Supervisor MAX16055
VINTH VIN1 VTH + VHYST VIN2 R1 VIN3 VIN4 VIN5 VIN6 VTH tRP RESET tRP BEGINS WHEN THE LAST SUPPLY EXCEEDS ITS VTH + VHYST R1 = R2 R2
MAX16055
( VVINTH TH
-1)
Figure 4. RESET Output with Various Input Voltages
Figure 5. Setting the Adjustable Threshold
Manual-Reset Input (MR)
Many P-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 20k pullup resistor to IN1. Connect a normally open momentary switch from MR to GND to create a manual-reset function. Connect a 0.1F 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.
Applications Information
Unused Inputs
Connect unused monitor inputs to a supply voltage higher than the specified threshold voltage. Connect a 100k 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.
Reset Output Pullup Resistor
When connecting a pullup resistor from RESET to a voltage rail lower than the voltage on IN1, the internal 70A 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.
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.
Power-Supply Bypassing and Grounding
IN1 powers the MAX16055. Connect a 0.1F 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.
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Ultra-Small, Hex Voltage, Microprocessor Supervisor
Selector Guide
PART* (SUFFIX IN BOLD) MAX16055A MAX16055B MAX16055C MAX16055D MAX16055E MAX16055F MAX16055G MAX16055H MAX16055I MAX16055J NOMINAL INPUT VOLTAGE (V) IN1 3.3 3.3 3.3 3.3 3.3 3.3 3.3 3.3 2.5 3.3 IN2 2.5 3.0 ADJ ADJ 2.5 2.5 2.5 ADJ ADJ 3.3 IN3 1.5 1.8 ADJ 1.5 ADJ 1.5 ADJ ADJ ADJ 2.5 IN4 1.8 1.5 1.8 ADJ 1.8 ADJ ADJ ADJ ADJ 1.2 IN5 1.2 1.1 ADJ ADJ ADJ ADJ ADJ ADJ ADJ 1.5 IN6 0.9 1.0 ADJ ADJ ADJ ADJ ADJ ADJ ADJ 1.2
MAX16055
*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).
Chip Information
PROCESS: BiCMOS
PACKAGE TYPE 10 MAX
Package Information
For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE CODE U10+2 DOCUMENT NO. 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
(c) 2009 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.

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