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? semiconductor components industries, llc, 2000 november, 2000 rev. 1 1 publication order number: max6501/d max6501, max6502 ultra small temperature switch with pin-selectable hysteresis the max6501 and max6502 are sot23 temperature switches that require no external components and the design is facilitated with factoryprogrammed temperature thresholds. a choice of factorytrimmed temperature trip points are available. pin selectable hysteresis of +2 c or +10 c allows flexibility to the design. these parts typically consume only 17 m a of current and operate over the entire 55 c to +125 c temperature range while offering accuracies of 0.5 c (typ) and 4 c (max). the max6501 has an open drain, active low output, meant for microprocessor reset control. the max6502 has a cmos, active high output designed to drive a logic level mosfet to turn on a fan or heater element. the max6501/6502 are aimed for hottemperature monitoring (+45 c to +115 c). these devices assert a logic signal when the temperature goes above the threshold. the max6501 and max6502 are offered in five standard temperature thresholds. available in 5pin sot23a packages, these parts are ideal for applications requiring high integration, small size, low power and low installed cost. features ? 5pin sot23a ? factoryprogrammed thresholds from +45 c to +115 c in 10 c increments ? pinselectable +2 c or +10 c hysteresis ? 0.5 c (typ) threshold accuracy over full temperature range ? no external components required ? 17 m a supply current typical applications ? thermal management in pcs and servers ? over temperature fail safe circuits ? simple fan controller ? temperature alarms ? projectors/printers ? notebook computers ? network boxes http://onsemi.com sot23a case 1212 1 pin connections 2 3 4 5 see detailed ordering and shipping information in the package dimensions section on page 9 of this data sheet. ordering information see general marking information in the device marking section on page 9 of this data sheet. device marking information 5 1 2 4 3 t over (t over )* gnd v cc *for max6502 note: 5pin sot23a is equivalent to eiaj sc74a gnd hyst max6501 max6502
max6501, max6502 http://onsemi.com 2 absolute maximum ratings* rating symbol value unit supply voltage v cc 0.3 to +7.0 v tover (max6501) 0.3 to +7.0 v tover (max6502) 0.3 to (v cc +0.3) v all other pins 0.3 to (v cc +0.3) v input current (all pins) 20 ma output current (all pins) 20 ma operating temperature range 55 to +125 c storage temperature range t stg 65 to +165 c lead temperature (soldering, 10 seconds) +300 c power dissipation (t a = +70 c) (derate 7.1 mw/ c above +70 c) 571 mw *staticsensitive device. unused devices must be stored in conductive material. protect devices from static discharge and static fields. stresses above those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only and f unctional operation of the device at these or any other conditions above those indicated in the operational sections of the specification s is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. electrical characteristics v cc = +2.7 v to +5.5 v, r pullup = 100 k w (max6501 only), c coupling = 100 pf from v cc to gnd, t a = t min to t max , unless otherwise noted. typical values are at t a = +25 c. characteristics test conditions symbol min typ max unit supply voltage range v cc 2.7 5.5 v supply current i cc 17 40 m a temperature threshold accuracy (note 1.) +45 c to +65 c +75 c to +115 c d t th 4.0 6.0 0.5 0.5 4.0 6.0 c temperature threshold hysteresis hyst = gnd hyst = v cc t hyst 2.0 10 c hyst input threshold v ih 0.8 x v cc v hyst input threshold v il 0.2 x v cc v output voltage high i source = 500 m a, v cc 2.7 v (max6502 only) i source = 800 m a, v cc 4.5 v (max6502 only) v oh 0.8 x v cc v cc 1.5 v output voltage low i sink = 1.2 ma, v cc 2.7 v i sink = 3.2 ma, v cc 4.5 v v ol 0.3 0.4 v opendrain output leakage current v cc = 2.7 v, v tover = 5.5 v (max6501 only) 10 na 1. the max6501 and max6502 are available with internal, factoryprogrammed temperature trip thresholds from +45 c to +115 c in +10 c increments.
max6501, max6502 http://onsemi.com 3 pin description max6501 max6502 name description 1,2 1,2 gnd ground. ground both pins together close to the chip. pin 2 provides the lowest thermal resistance to the die. 3 3 hyst hysteresis input. connect hyst to gnd for +2 c hysteresis, or connect to v cc for +10 c hysteresis. 4 4 v cc supply input (+2.7 v to +5.5 v). recommend 100 pf or greater coupling capacitor from v cc to gnd. 5 tover opendrain, activelow output. tover goes low when the die temperature exceeds the factoryprogrammed temperature threshold. connect to a 100 k w pullup resistor. may be pulled up to a voltage higher than v cc . 5 tover push/pull activehigh output. tover goes high when the die temperature exceeds the factoryprogrammed temperature threshold. typical operating circuit gnd max6502 gnd v cc v cc gnd hyst tover int m p 100 pf +2.7 v to +5.5 v detailed description the max6501 and max6502 integrate a temperature sensor with a factoryprogrammed threshold switch. a logic signal is asserted when the die temperature crosses the factory programmed threshold. an external hysteresis input pin allows the user to select either 2 c or 10 c hysteresis to give further flexibility to the design of the application. the max6501 and max6502 are intended for a temperature range from 45 c to 115 c in a 10 c increment. the max6501 has an open drain output and the max6502 has a push/pull output stage. the max6501 is intended for applications with a microprocessor reset input. the max6502 is intended for applications of turning on a fan or heater element. hysteresis input to prevent the output from achattering'' at or near the trip point temperature, a selectable hyst input pin is provided. hysteresis can be externally selected at 2 c (hyst = gnd) or 10 c (hyst = v dd ) by means of the cmos compatible hyst input pin. do not let the hyst pin float as this could cause increase supply current. the hysteresis does not depend on the part's programmed trip threshold. table 1. factoryprogrammed threshold range part number threshold (t th ) range max6501 +45 c t th +115 c max6502 +45 c t th +115 c thermal considerations with a very low 17 m a supply current, the max6501 and max6502 dissipates very little power. thus, the die temperature is basically the same as the package temperature. to minimize the error in temperature readings, the load current should be limited to a few milliamps. as an example, the typical thermal resistance of a 5pin sot23a package is 140 c/w. if the max6501 had to sink 1.0 ma, and the output voltage is guaranteed to be less than 0.3 v, then an additional 0.3 mw of power is dissipated within the ic. this corresponds to a 0.042 c rise in die temperature in the 5pin sot23a.
max6501, max6502 http://onsemi.com 4 temperature monitoring accuracy depends on the thermal resistance between the device being monitored and the temperature switch die. heat flows primarily through the leads onto the die. pin 2 provides the lowest thermal resistance to the die. to achieve the best temperature monitoring results, the max6501 and max6502 should be placed closest to the device being monitored. in addition, a short and wide copper trace from pin 2 to the device should be used. in some cases, the 5pin sot23a package can be placed directly under the socketed microprocessor for improved thermal contact. applications the max6501 has an open drain output and is therefore intended to interface as a microprocessor reset input. moreover, the combination of these two devices can be used to implement a temperature window alarm by wireoring the outputs and using an external pull up resistor. (see figure 1) gnd max6501ukp115t v cc gnd hyst 100 pf +5 v gnd v cc gnd hyst max6501ukp055t temperature out of range r pullup 100 k 100 pf figure 1. over and under temperature alarm the max6502 can be used to control a dc fan. the fan turns on when the sensed temperature rises above the factory set threshold and remains on until the temperature falls below threshold minus the hysteresis selected. an additional fail safe measure could be designed by using a second max6502 with a higher temperature threshold to alert the user of an impending thermal shutdown, should the temperature continue to rise. (see figure 2)
max6501, max6502 http://onsemi.com 5 heat heat gnd max6502ukp095t hyst 100 pf +5 v gnd v cc gnd hyst max6502ukp055t temperature fault m p 100 pf v cc gnd tover tover fan control figure 2. fan control circuit with over temperature alert max6501 max6502 hyst tover positive tempco reference - + negative tempco reference hyst network hyst tover positive tempco reference - + negative tempco reference hyst network max6501 max6502 figure 3. functional block diagrams max6501 max6502 v tover v tover cold +25 ct th hot temp with 100 k w pullup cold +25 ct th hot temp max6501 max6502
max6501, max6502 http://onsemi.com 6 typical characteristics 12 10 6 8 4 2 0 30 20 35 15 25 10 40 50 5 30 60 0 20 50 1 1 3 2 accuracy ( c) frequency 10 40 0 4 temperature ( c) figure 4. trip threshold accuracy figure 5. supply current vs. temperature supply current ( m a) 0 180 160 120 80 60 40 140 100 60 40 20 20 100 120 140 figure 6. max6502 output source resistance vs. temperature temperature ( c) figure 7. output sink resistance vs. temperature temperature ( c) output sink resistance ( w ) output source resistance ( w ) figure 8. hysteresis vs. trip temperature trip temperature ( c) hysteresis ( c) 3 45 35 15 5 25 55 75 95 60 20 40 0 20 60 40 80 04050 30 20 60 10 100 30 60 20 40 10 70 80 v cc = 2.7 v 45 2 5 0 100 120 140 80 180 v cc = 4.0 v v cc = 5.0 v v cc = 2.7 v v cc = 4.0 v v cc = 5.0 v 0 80 90 70 115 max6501/6502 max6501/6502 hys = gnd hys = v cc
max6501, max6502 http://onsemi.com 7 typical characteristics figure 9. sot23 thermal step response in perfluorinated fluid 5 sec/div 20 sec/div figure 10. sot23 thermal step response in still air mounted on 0.75 in 2 of 2 oz. copper +15 c/div mounted on 0.75 in 2 of 2 oz. copper +100 c +25 c +12.5 c/div +100 c +25 c
max6501, max6502 http://onsemi.com 8 w = width of carrier tape device marking device marking pin 1 user direction of feed component taping orientation for 5pin sot23a (eiaj sc74a) devices standard reel component orientation tr suffix device (mark right side up) sot23a package carrier width (w) pitch (p) part per full reel reel size 8 mm 4 mm 3000 7 inches carrier tape, reel size, and number of components per reel reverse reel component orientation rt suffix device (mark upside down) pin 1 user direction of feed p = pitch
max6501, max6502 http://onsemi.com 9 and = two letter part number codes = year and twomonth period code = lot id number marking diagram 12 3 4 12 3 4 ordering information device package standard temperature threshold output stage marking and 2 1 shipping max6501ukp045t 45 c open drain ha max6501ukp055t* 55 c open drain hb max6501ukp065t 65 c open drain hc max6501ukp075t 75 c open drain hd max6501ukp085t 85 c open drain he max6501ukp095t* 95 c open drain hf max6501ukp105t 105 c open drain hg max6501ukp115t* 5 pin sot 23a 115 c open drain hh 3000 units tape and reel max6502ukp045t 5pin sot23a 45 c push/pull ja 3000 units tape and reel max6502ukp055t* 55 c push/pull jb max6502ukp065t 65 c push/pull jc max6502ukp075t 75 c push/pull jd max6502ukp085t 85 c push/pull je max6502ukp095t* 95 c push/pull jf max6502ukp105t 105 c push/pull jg max6502ukp115t* 115 c push/pull jh *default: contact your on semiconductor sales representative for other temperature threshold options.
max6501, max6502 http://onsemi.com 10 notes
max6501, max6502 http://onsemi.com 11 package dimensions sot23 case 121201 issue o dim min max millimeters a1 0.00 0.10 a2 1.00 1.30 b 0.30 0.50 c 0.10 0.25 d 2.80 3.00 e 2.50 3.10 e1 1.50 1.80 e 0.95 bsc e1 1.90 bsc l l1 0.45 0.75 notes: 1. dimensions are in millimeters. 2. interpret dimensions and tolerances per asme y14.5m, 1994. 3. datum c is a seating plane. a 1 5 23 4 d e1 b l1 e e e1 c m 0.10 c s b s a b 5x a2 a1 s 0.05 c l 0.20 ---
max6501, max6502 http://onsemi.com 12 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. publication ordering information central/south america: spanish phone : 3033087143 (monfri 8:00am to 5:00pm mst) email : onlitspanish@hibbertco.com tollfree from mexico: dial 018002882872 for access then dial 8662979322 asia/pacific : ldc for on semiconductor asia support phone : 3036752121 (tuefri 9:00am to 1:00pm, hong kong time) toll free from hong kong & singapore: 00180044223781 email : onlitasia@hibbertco.com japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. max6501/d north america literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com fax response line: 3036752167 or 8003443810 toll free usa/canada n. american technical support : 8002829855 toll free usa/canada europe: ldc for on semiconductor european support german phone : (+1) 3033087140 (monfri 2:30pm to 7:00pm cet) email : onlitgerman@hibbertco.com french phone : (+1) 3033087141 (monfri 2:00pm to 7:00pm cet) email : onlitfrench@hibbertco.com english phone : (+1) 3033087142 (monfri 12:00pm to 5:00pm gmt) email : onlit@hibbertco.com european tollfree access*: 0080044223781 *available from germany, france, italy, uk, ireland

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