________________general description the max6501?ax6504 low-cost, fully integrated tem-perature switches assert a logic signal when their die temperature crosses a factory-programmed threshold. operating from a +2.7v to +5.5v supply, these devices feature two on-chip, temperature-dependent voltage references and a comparator. they are available with factory-trimmed temperature trip thresholds from -45? to +125? in 10? increments, and are accurate to ?.5? (typ) or ?? (max). these devices require no external components and typically consume 30? sup- ply current. hysteresis is pin-selectable at 2? or 10?. the max6501/max6503 have an active-low, open-drain output intended to interface with a microprocessor (?) reset input. the max6502/max6504 have an active- high, push-pull output intended to directly drive fan- control logic. the max6501/max6502 are offered with hot-temperature thresholds (+35? to +125?), assert- ing when the temperature is above the threshold. the max6503/max6504 are offered with cold-temperature thresholds (-45? to +15?), asserting when the tem- perature is below the threshold. the max6501?ax6504 are offered in eight standard temperature versions; contact the factory for pricing and availability of nonstandard temperature versions. they are available in a 5-pin sot23 package. ____________________________features ? ? 0.5c (typical) threshold accuracy over full temperature range ? ? no external components required ? ? low cost ? ? 30 a supply current ? ? factory-programmed thresholds from -45c to +125c in 10c increments ? ? open-drain output (max6501/max6503) push-pull output (max6502/max6504) ? ? pin-selectable 2c or 10c hysteresis ? ? sot23-5 package max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 ___________________________________________________ _____________ maxim integrated products 1 19-1280; rev 6; 2/11 ordering information selector guide and pin configurations appear at end of data sheet. max6502 +2.7v to +5.5v gnd hyst tover p int gnd gnd v cc v cc typical operating circuit for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part temp range pin-package ma6501 uk_ _ _ _+t -55c to +125c 5 sot23 ma6502 uk_ _ _ _+t -55c to +125c 5 sot23 ma6503 uk_ _ _ _+t -55c to +125c 5 sot23 ma6504 uk_ _ _ _+t -55c to +125c 5 sot23 note: these parts are offered in eight standard temperature versions with a minimum order of 2,500 pieces. to complete the suffix information, add p or n for positive or negative trip temperature, and select an available trip point in degrees centigrade. for example, the max6501ukp065+t describes a max6501 in a sot23 package with a +65? threshold. contact the factory for pricing and availability of nonstandard temperature versions (minimum order 10,000 pieces). + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel. ________________________applications ? temperature monitoring in high-speedcomputers temperature controltemperature alarms fan control downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 2 __________________________________________________ _____________________________________ absolute maximum ratings electrical characteristics (v cc = +2.7v to +5.5v, r pullup = 100k (max6501/max6503 only), t a = t min to t max , unless otherwise noted. typical values are at t a = +25?.) (note 1) stresses beyond those listed under ?bsolute 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. note 1: 100% production tested at t a = +25?. specifications over temperature limits are guaranteed by design. note 2: the max6501?ax6504 are available with internal, factory-programmed temperature trip thresholds from -45? to +125?in +10? increments ( see selector guide). note 3: guaranteed by design. supply voltage (v cc ) range....................................-0.3v to +7v tover (max6501) ...................................................-0.3v to +7v tover (max6502) .....................................-0.3v to (v cc + 0.3v) tunder (max6503) ................................................-0.3v to +7v tunder (max6504) ..................................-0.3v to (v cc + 0.3v) all other pins..............................................-0.3v to (v cc + 0.3v) input current (all pins) ........................................................20ma output current (all pins) .....................................................20ma continuous power dissipation (t a = +70?) sot23 (derate 3.1mw/? above +70?) ......................247mw operating temperature range .........................-55? to +135? storage temperature range .............................-65? to +165? lead temperature (soldering, 10s) .................................+300? soldering temperature (reflow) .......................................+260? -45? to -25? v cc = 2.7v, v tunder = 5.5v (max6503), v tover = 5.5v (max6501) -15? to +15? hyst = gnd i source = 500?, v cc > 2.7v (max6502/max6504 only) i sink = 1.2ma, v cc > 2.7v conditions -6 ?.5 +6 ? 30 85 i cc v 2.7 5.5 v cc supply voltage range supply current na 10 open-drain output leakagecurrent -4 ?.5 +4 2 t hyst temperature thresholdhysteresis v 0.8 x v cc 0.3 units min typ max symbol parameter +35? to +65? +75? to +125? -4 ?.5 +4 ? -6 ?.5 +6 ? t th temperature thresholdaccuracy (note 2) v 0.2 x v cc v il hyst input threshold(note 3) 0.8 x v cc v ih i sink = 3.2ma, v cc > 4.5v v 0.4 v ol output voltage low hyst = v cc 10 ? i source = 800?, v cc > 4.5v (max6502/max6504 only) v cc - 1.5 v oh output voltage high downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 _______________________________________________________________________________________ 3 0 5 10 15 20 25 30 35 40 -55 5 -25 35 65 95 125 supply current vs. temperature max6501 toc01 temperature ( c) supply current ( a) 0 100 200 300 400 500 600 700 800 -55 5 -25 35 65 95 125 max6502/max6504 output source resistance vs. temperature max6501 toc02 temperature ( c) output source resistance ( ) v cc = 2.7v v cc = 5.0v v cc = 3.3v 0 20 40 60 80 100 120 140 160 -55 5 -25 35 65 95 125 output sink resistance vs. temperature max6501 toc03 temperature ( c) output sink resistance ( ) v cc = 2.7v v cc = 5.0v v cc = 3.3v +15?/div +100?+25? sot23 thermal step response in perfluorinated fluid max6501 toc4 5sec/div mounted on 0.75in 2 of 2 oz. copper 0 42 86 10 12 14 16 -5 15 -25 -45 35 55 75 95 115 hysteresis vs. trip temperature max6501 toc8 trip temperature ( c) hysteresis ( c) max6503max6504 hyst = v cc max6501max6502 hyst = v cc max6501max6502 hyst = gnd max6503max6504 hyst = gnd +12.5?/div +100?+25? sot23 thermal step response in still air max6501 toc5 20sec/div mounted on 0.75in 2 of 2 oz. copper trace a: tover voltage, r pullup = 100k trace b: v cc pulse driven from 3.3v cmos logic output max6501 startup and power-down (t < t th ) b a max6501 toc07 trace a: tover voltage, r pullup = 100k trace b: v cc pulse driven from 3.3v cmos logic output max6501 startup delay (t > t th ) b a max6501 toc07a __________________________________________typical operating characteristics (v cc = +5v, r pullup = 100k (max6501/max6503), t a = +25?, unless otherwise noted.) 0 10 20 30 40 50 60 -5 -4 -3 -2 -1 0 1 2 3 4 5 trip threshold accuracy max6501 toc-a accuracy ( c) percentage of parts sampled (%) sample size = 300 downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 4 __________________________________________________ _____________________________________ pin description 1, 2 1, 2 ground. not internally connected. connect both ground pinstogether close to the chip. pin 2 provides the lowest thermal resistance to the die. 1, 2 pin 1, 2 gnd 3 3 hysteresis input. connect hyst to gnd for 2? hysteresis, orconnect to v cc for 10? hysteresis. 3 3 hyst 4 4 supply input (+2.7v to +5.5v) 5 open-drain, active-low output. tover goes low when the die temperature exceeds the factory-programmed temperaturethreshold. connect to a 100k pullup resistor. may be pulled up to a voltage higher than v cc . tover 4 4 v cc 5 push-pull active-high output. tover goes high when the die tem-perature exceeds the factory-programmed temperature threshold. open-drain, active-low output. tunder goes low when the die temperature goes below the factory-programmed tempera-ture threshold. connect to a 100k pullup resistor. may be pulled up to a voltage higher than v cc . 5 tunder push-pull active-high output. tunder goes high when the die tem-perature falls below the factory-programmed temperature threshold. 5 tunder tover max6502 max6501 max6503 max6504 name function ________________general description the max6501?ax6504 fully integrated temperatureswitches incorporate two temperature-dependent refer- ences and a comparator. one reference exhibits a pos- itive temperature coefficient and the other a negative temperature coefficient (figure 1). the temperature at which the two reference voltages are equal determines the temperature trip point. pin-selectable 2? or 10? hysteresis keeps the output from oscillating when the die temperature approaches the threshold temperature. the max6501/max6503 have an active-low, open- drain output structure that can only sink current. the max6502/max6504 have an active-high, push-pull out- put structure that can sink or source current. the inter- nal power-on reset circuit guarantees the output is at t th = +25? state at startup for 50?. the max6501?ax6504 are available with factory-preset temperature thresholds from -45? to +125? in 10? increments. table 1 lists the available temperature threshold ranges. the max6501/max6503 outputs are intended to interface with a microprocessor (?) reset input (figure 2). the max6502/max6504 outputs are intended for applications such as driving a fan control (figure 3). hysteresis input the hyst pin is a cmos-compatible input that selectshysteresis at either a high level (10? for hyst = v cc ) or a low level (2? for hyst = gnd). hysteresis pre-vents the output from oscillating when the temperature approaches the trip point. the hyst pin should not be left unconnected. drive hyst close to ground or v cc . other input voltages cause increased supply current.the actual amount of hysteresis depends on the part? programmed trip threshold (see the typical operating characteristics ). table 1. factory-programmed threshold range +35? < t th < +125? +35? < t th < +125? threshold (t th ) range -45? < t th < +15? -45? < t th < +15? max6503 max6504 max6501 max6502 part downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 ___________________________________________________ ____________________________________ 5 positive tempco reference negative tempco reference hyst network toverhyst tover temp cold +25 ct th v max6501 positive tempco reference negative tempco reference hyst network toverhyst tover temp cold +25 ct th hothot v positive tempco reference negative tempco reference hyst network tunderhyst tunder temp cold t th +25 c hot v positive tempco reference negative tempco reference hyst network tunderhyst tunder temp cold t th +25 c hot v max6502 max6503 max6504 max6501 with 100k pullup max6504 max6503 with 100k pullup max6502 figure 1. block and functional diagrams downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 6 __________________________________________________ _____________________________________ applications information thermal considerations the max6501?ax6504 supply current is typically30?. when used to drive high-impedance loads, the devices dissipate negligible power. therefore, the die temperature is essentially the same as the package temperature. the key to accurate temperature monitor- ing is good thermal contact between the max6501 max6504 package and the device being monitored. in some applications, the sot23 package may be small enough to fit underneath a socketed ?, allowing the device to monitor the ?? temperature directly. use the monitor? output to reset the ?, assert an interrupt, or trigger an external alarm. accurate temperature monitoring depends on the ther- mal resistance between the device being monitored and the max6501?ax6504 die. heat flows in and out of plastic packages, primarily through the leads. pin 2 of the sot23-5 package provides the lowest thermal resistance to the die. short, wide copper traces leading to the temperature monitor ensure that heat transfers quickly and reliably. the rise in die temperature due to self-heating is given by the following formula: ? t j = p dissipation x ja where p dissipation is the power dissipated by the max6501?ax6504, and ja is the package? thermal resistance.the typical thermal resistance is 140?/w for the sot23 package. to limit the effects of self-heating, minimize the output currents. for example, if the max6501 or max6503 sink 1ma, the output voltage is guaranteed to be less than 0.3v. therefore, an addi- tional 0.3mw of power is dissipated within the ic. this corresponds to a 0.042? shift in the die temperature in the sot23. temperature-window alarm the max6501?ax6504 temperature switch outputsassert when the die temperature is outside the factory- programmed range. combining the outputs of two devices creates an over/undertemperature alarm. the max6501/max6503 and the max6502/max6504 are designed to form two complementary pairs, each con- taining one cold trip-point output and one hot trip-point output. the assertion of either output alerts the system to an out-of-range temperature. the max6502/max6504 push/pull output stages can be ored to produce a ther- mal out-of-range alarm. more favorably, a max6501/ max6503 can be directly wire-ored with a single exter- nal resistor to accomplish the same task (figure 4). the temperature window alarms shown in figure 4 can be used to accurately determine when a device? tem- perature falls out of the -5? to +75? range. the ther- mal-overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperature- dependent function. low-cost, fail-safe temperature monitor in high-performance/high-reliability applications, multi-ple temperature monitoring is important. the high-level integration and low cost of the max6501?ax6504 facilitate the use of multiple temperature monitors to in- crease system reliability. figure 5? application uses two max6502s with different temperature thresholds to ensure that fault conditions that can overheat the moni- tored device cause no permanent damage. the first temperature monitor activates the fan when the die temperature exceeds +45?. the second max6502 triggers a system shutdown if the die temperature reaches +75?. the second temperature monitor? out- put asserts when a wide variety of destructive fault con- ditions occur, including latchups, short circuits, and cooling-system failures. max6502 +5v tover gnd gnd v cc hyst p fan heat v cc figure 3. overtemperature fan control max6501 +3.3v gnd hyst gnd v cc p heat v cc r pullup 100k tover int shutdown or reset figure 2. microprocessor alarm/reset downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 ___________________________________________________ ____________________________________ 7 max6503_ _n005 max6501_ _p075 +5v hyst hyst gnd gnd v cc gnd gnd v cc r pull-up 100k tover tunder out of range max6502_ _p075 hyst gnd gnd +5v max6504_ _n005 gnd gnd hyst v cc v cc tover tunder out of range overtempundertemp figure 4. temperature-window alarms max6502_ _p075 gnd gnd hyst +5v max6502_ _p045 gnd gnd hyst v cc v cc tovertover temperature fault fan control p heat heat figure 5. low-power, high-reliability, fail-safe temperature monitor table 2. device marking codes max6502ukp115 2.5k acfy max6502ukp105 10k acfz max6504ukp015 10k adke max6504ukp005 2.5k abzy max6504ukn005 10k advx max6504ukn015 2.5k acgd max6504ukn025 10k advt max6504ukn035 10k advu max6504ukn045 10k acax device minimum order code max6503ukp015 10k adpn max6503ukp005 2.5k abzx max6503ukn005 10k adnz max6503ukn015 2.5k acfx max6503ukn025 10k advr max6503ukn035 10k advs max6503ukn045 10k adiz max6502ukp095 2.5k abzw max6502ukp085 2.5k acga max6502ukp075 2.5k acgb max6502ukp065 2.5k abzv max6502ukp055 2.5k acgc max6502ukp045 2.5k abzu max6502ukp035 10k abzg max6501ukp115 2.5k acag max6501ukp105 10k acfu max6501ukp095 2.5k abzt max6501ukp085 2.5k acdp MAX6501UKP075 2.5k acfv max6501ukp065 2.5k abzs max6501ukp055 2.5k acfw max6501ukp045 2.5k abzr max6501ukp035 10k abzf device minimum order code max6501ukp125 25k adqk max6502ukp125 25k adud downloaded from: http:///
max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 8 __________________________________________________ _____________________________________ gnd v cc hyst ( ) are for max6502. 15 tover(tover) gnd max6501max6502 sot23 top view 234 gnd v cc hyst ( ) are for max6504. 15 tunder(tunder) gnd max6503max6504 sot23 234 pin configurations chip information substrate connected to gnd package information for the latest package outline information and land patterns(footprints), go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only.package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. part max6501 max6502 max6503 max6504 output stage open- drain push-pull open- drain push-pull trip temp threshold hot hot cold cold ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? selector guide -45 -35 -25 -15 -5 +5 +15 +35 +45 +55 +65 +75 +85 +95 +105 +115 +125 ? ? standard temperature thresholds (c) package type package code outline no. land pattern no. 5 sot23 u5+2 21-0057 90-0174 downloaded from: http:///
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 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. max6501?ax6504 low-cost, +2.7v to +5.5v, micropower temperature switches in sot23 revision history revision number revision date description pages changed 5 10/06 in table 2 updated the device marking codes for max6503ukn035, max6503ukn025, max6503ukn005, max6503ukp015, max6504ukn035, max6504ukn025, and max6504ukn005 7 6 2/11 removed the to-220 package from entire data sheet; changed all leaded p arts to lead(pb)-free parts in the ordering information table; in the absolute maimum ratings section changed the continuous power dissipation numbers (7.1mw/c to 3.1mw/c and 571mw to 247mw) and added the soldering temperature; added the package information table all downloaded from: http:///
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