general description the MAX16055 precision hex voltage microprocessor (?) supervisory circuit monitors up to six system-sup- ply voltages and asserts a single reset when any one supply voltage drops below its preset threshold. the device significantly reduces system size and compo- nent count while improving reliability compared to multi- ple ics or discrete components. a variety of factory-trimmed threshold voltages are avail- able to accommodate different supply voltages and tol- erance 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 thresh- old. the reset output features a weak internal pullup (typically 70?) 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 avail- able in a small 10-pin ?ax (3mm x 3mm) package. the MAX16055 operates over the -40? to +125? automotive temperature range. applications features 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 adjustable voltage threshold monitors down to 0.5v with 1.5% accuracy open-drain reset output with 70? internal pullup fixed 140ms (min) reset timeout period manual reset input reset valid for in1 1v or in2 1v tolerance select (5%/10%) input immune to short supply transients MAX16055 ultra-small, hex voltage, microprocessor supervisor ________________________________________________________________ maxim integrated products 1 1 + 2 3 4 5 10 9 8 7 6 gnd reset mr tol in4 in3 in2 in1 MAX16055 max top view in6 in5 pin configuration ordering information MAX16055 p reset v cc 10k ? in2 mr gnd tol monitored supplies in1 0.1 f in3 in4 in5 in6 typical operating circuit 19-4411; rev 0; 1/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. + 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. part temp range pin-package MAX16055_aub+* -40? to +125? 10 ?ax telecommunications high-end printers desktop and notebook computers data storage equipment networking equipment industrial equipment set-top boxes servers/workstations ?ax is a registered trademark of maxim integrated products, inc.
MAX16055 ultra-small, hex voltage, microprocessor supervisor 2 _______________________________________________________________________________________ absolute maximum ratings electrical characteristics (v in1 = 1v to 5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v in1 = 3.3v, t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. reset , tol, mr , in_ to gnd ..................................-0.3v to +6v input/output current (all pins) ............................................20ma continuous power dissipation (t a = +70?) 10-pin ?ax (derate 5.6mw/? above +70?) ...........444mw operating temperature range .........................-40? to +125? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max unit operating voltage range v in1 (note 2) 1.0 5.5 v v in_ = nominal input voltage (for in2?n6; 3.3v, 3.0v, 2.5v, 1.8v, 1.5v, 1.2v, 1.1v, 1.0v, 0.9v supplies) 25 40 v in1 = nominal input voltage (for +3.3v in1 supply) 55 115 input current (note 3) i in_ v in_ = 0 to 0.5v or v adj (for adjustable thresholds) -0.1 +0.1 ? 3.3v, tol = gnd 3.00 3.08 3.15 3.3v, tol = v in1 2.85 2.93 3.00 3.0v, tol = gnd 2.70 2.78 2.85 3.0v , tol = v in1 2.55 2.63 2.70 2.5v, tol = gnd 2.25 2.32 2.38 2.5v, tol = v in1 2.13 2.19 2.25 1.8v, tol = gnd 1.62 1.67 1.71 1.8v, tol = v in1 1.53 1.58 1.62 1.5v, tol = gnd 1.355 1.389 1.425 1.5v, tol = v in1 1.283 1.316 1.350 1.2v, tol = gnd 1.084 1.112 1.140 1.2v, tol = v in1 1.027 1.053 1.08 1.1v, tol = gnd 0.993 1.019 1.045 1.1v, tol = v in1 0.941 0.965 0.99 1.0v, tol = gnd 0.903 0.926 0.95 1.0v, tol = v in1 0.856 0.878 0.90 0.9v , tol = gnd 0.813 0.834 0.855 threshold voltage v th v in_ decreasing 0.9v, tol = v in1 0.770 0.790 0.810 v
MAX16055 ultra-small, hex voltage, microprocessor supervisor _______________________________________________________________________________________ 3 note 1: 100% production tested at t a = +25?. limits over temperature guaranteed by design. note 2: the devices are powered from in1. note 3: monitored in1 voltage is also the device power supply. note 4: reset output is guaranteed to be in the correct state for in1 or in2 falling down to 1v. parameter symbol conditions min typ max unit tol = gnd 0.491 0.5 0.506 adjustable threshold v th v in_ decreasing tol = v cc 0.465 0.472 0.479 v reset threshold hysteresis v hyst v in_ increasing relative to v in_ decreasing 0.3 %v th reset threshold temperature coefficient 60 ppm/? in_ to reset delay t rd v in_ falling at 10mv/? from (v th + 50mv) to (v th - 50mv) 20 ? reset timeout period t rp 140 200 280 ms v in1 = 5v, i sink = 2ma 0.3 v in1 = 2.5v, i sink = 1.2ma 0.4 reset output low (note 4) v ol v in1 = 1.0v, i sink = 50? 0.3 v reset output high v oh v in1 > 2.55v, i source = 6? (min), reset not asserted 0.8 x v in1 v reset output high source current i oh v in1 > 2.55v, reset not asserted 70 ? tol input current tol = in1 100 na mr , tol input voltage low v il 0.3 x v in1 v mr , tol input voltage high v ih 0.7 x v in1 v mr minimum pulse width 1 s mr glitch rejection 100 ns mr -to- reset delay 200 ns mr pullup resistance 10 20 33 k ? electrical characteristics (continued) (v in1 = 1v to 5.5v, t a = -40? to +125?, unless otherwise noted. typical values are at v in1 = 3.3v, t a = +25?.) (note 1)
MAX16055 ultra-small, hex voltage, microprocessor supervisor 4 _______________________________________________________________________________________ typical operating characteristics (v in1 = 3.3v, t a = +25?, unless otherwise noted.) in1 input current vs. temperature MAX16055 toc01 temperature ( c) in1 input current ( a) 110 95 65 80 -10 5 20 35 50 -25 44 42 46 48 50 52 54 56 58 60 62 64 66 68 70 40 -40 125 in1 input current vs. in1 voltage MAX16055 toc02 in1 voltage (v) in1 input current ( a) 5.0 4.5 0.5 1.0 1.5 2.5 3.0 3.5 2.0 4.0 10 20 30 40 50 60 70 80 0 0 5.5 normalized threshold error vs. temperature MAX16055 toc03 temperature ( c) normalized threshold error (%) 95 80 50 65 -10 5 20 35 -25 -0.8 -0.6 -0.4 -0.2 0 0.2 0.4 0.6 0.8 1.0 -1.0 -40 125 110 maximum in_ transient duration vs. reset threshold overdrive MAX16055 toc04 in_ overdrive (mv) maximum in_ transient duration ( s) 900 800 100 200 300 500 600 400 700 10 20 30 40 50 60 70 80 0 0 1000 reset asserts above this line reset propagation delay vs. reset threshold overdrive (in_ decreasing) MAX16055 toc05 in_ overdrive (mv) reset propagation delay ( s) 900 800 600 700 200 300 400 500 100 10 20 30 40 50 60 70 80 90 100 0 0 1000 reset pullup and pulldown response (c l = 47pf) MAX16055 toc06 in_ 100mv/div ac-coupled reset 2v/div 20 s/div reset timeout period vs. temperature MAX16055 toc07 reset threshold (ms) 192 194 196 198 200 202 204 206 208 210 190 temperature ( c) 110 95 80 65 50 35 20 5 -10 -25 -40 125 v in_ = 3.3v mr-to-reset propagation delay vs. temperature MAX16055 toc08 temperature ( c) mr-to-reset delay (ns) 120 110 150 140 130 170 160 200 190 180 210 100 110 95 80 65 50 35 20 5 -10 -25 -40 125 v in_ = 3.3v
reset timeout delay MAX16055 toc09 in_ 1v/div reset 1v/div 40ms/div mr-to-reset propagation delay MAX16055 toc10 mr 2v/div reset 2v/div 40ns/div v in = 3.3v MAX16055 ultra-small, hex voltage, microprocessor supervisor _______________________________________________________________________________________ 5 typical operating characteristics (continued) (v in1 = 3.3v, t a = +25?, unless otherwise noted.) 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 0.1? 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 20k ? 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 (70?) internal pullup to in1. 10 gnd ground
MAX16055 ultra-small, hex voltage, microprocessor supervisor 6 _______________________________________________________________________________________ in1 3.3v all devices are powered from in1 (3.3v/2.5v); reset is valid if v in1 or v in2 is greater than 1v in2 adj in3 adj MAX16055c in4 1.8v in5 adj in6 adj tol mr ref timeout (200ms) reset 70 a uvlo in1 in1 in2 pullup detailed description the MAX16055 hex voltage ? supervisory circuit main- tains system integrity in multisupply systems (figure 1). the MAX16055 offers accurate, factory-fixed undervolt- age threshold options for monitoring very low voltages. the MAX16055 also offers one to five adjustable thresh- olds 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 thresh- old 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. figure 1. functional diagram
the MAX16055 is immune to short in_ transients. each of the internal comparators provides a typical hystere- sis of 0.3% with respect to the reset threshold. this built-in hysteresis improves the monitor? 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. 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 peri- od 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 (70? typ). for many applications, no exter- nal 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 pre- vents reverse current flow from the external pullup volt- age 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 volt- age. 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 net- work to the circuit as shown in figure 5: v inth = 0.5v x (r1 + r2)/r2 therefore: r1 = r2 ((v inth /0.5v) - 1) use high valued resistors (~ 100k ? ) to minimize current through the external resistors. use lower valued resis- tors 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. MAX16055 ultra-small, hex voltage, microprocessor supervisor _______________________________________________________________________________________ 7 v th_ + v hyst reset in_ v th_ 90% 10% t rp t rd figure 2. reset output timing diagram MAX16055 p reset reset +3.3v v cc 10k ? gnd gnd in1 +5v figure 3. interfacing with external logic-supply voltage
manual-reset input ( mr ) many ?-based products require manual-reset capabil- ity. 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 0.1? 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. tolerance (tol) the MAX16055 features an adjustable threshold toler- ance. connect tol to gnd to set the threshold volt- ages 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. 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 70? pullup current flows through the pullup resistor, causing the voltage at reset to be higher than the volt- age rail when reset is deasserted. ensure that the value of the pullup resistor is low enough that the volt- age rise does not cause problems. power-supply bypassing and grounding in1 powers the MAX16055. connect a 0.1? bypass capacitor from in1 to ground. all monitored inputs are immune to short supply transients. add bypass capaci- tors from in2?n6 to gnd to improve noise immunity. MAX16055 ultra-small, hex voltage, microprocessor supervisor 8 _______________________________________________________________________________________ v th + v hyst v in1 v in2 v in3 v in5 v in6 reset v in4 t rp t rp begins when the last supply exceeds its v th + v hyst figure 4. reset output with various input voltages r1 v th r1 = r2 ( -1 ) v inth v th v inth r2 MAX16055 figure 5. setting the adjustable threshold
MAX16055 ultra-small, hex voltage, microprocessor supervisor maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it 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. chip information process: bicmos selector guide nominal input voltage (v) part* ( suffix in bold) in1 in2 in3 in4 in5 in6 MAX16055 a 3.3 2.5 1.5 1.8 1.2 0.9 MAX16055 b 3.3 3.0 1.8 1.5 1.1 1.0 MAX16055 c 3.3 adj adj 1.8 adj adj MAX16055 d 3.3 adj 1.5 adj adj adj MAX16055 e 3.3 2.5 adj 1.8 adj adj MAX16055 f 3.3 2.5 1.5 adj adj adj MAX16055 g 3.3 2.5 adj adj adj adj MAX16055 h 3.3 adj adj adj adj adj MAX16055 i 2.5 adj adj adj adj adj MAX16055 j 3.3 3.3 2.5 1.2 1.5 1.2 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . package type package code document no. 10 ?ax u10+2 21-0061 * adjustable voltage is based on the 0.5v internal threshold. external threshold voltage can be set using an external resistor-di vider. (v adj = 0.500v typ).
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