tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ?2001 microchip technology inc. ds21451a ultra small temperature switch with pin-selectable hysteresis features 5-pin sot-23a factory-programmed thresholds from ?5 c to +115 c in 10 c increments pin-selectable +2 c or +10 c hysteresis 0.5 c (typ) threshold accuracy over full temperature range no external components required 17 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 general description the tc6501 through tc6504 are sot-23 temperature switches that require no external components and the design is facilitated with factory programmed temperature thresholds. a choice of factory-trimmed 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 a of current and operate over the entire ?5?c to +125?c temperature range while offering accura- cies of 0.5?c (typ) and 4?c (max). the tc6501 and tc6503 offer an open drain, active low output, meant for microprocessor reset control. the tc6502 and tc6504 have a cmos, active high output designed to drive a logic level mosfet to turn on a fan or heater element. the tc6501/tc6502 are aimed for hot-temperature monitoring (+35 c to +115 c). these devices assert a logic signal when the temperature goes above the threshhold. the tc6503/tc6504 are aimed for cold-temperature moni- toring (-45 c to +15 c). these devices assert a logic signal when the temperature goes below the threshhold. the tc6501 through tc6504 are offered in five stan- dard temperature thresholds. available in 5-pin sot-23a packages, these parts are ideal for applications requiring high integration, small size, low power and low installed cost. . t under (t under )** hyst gnd tc6503 tc6504 1 2 3 5 v cc gnd 4 5-pin sot-23a pin configurations * for tc6502 ** for tc6504 t over (t over )* hyst gnd tc6501 tc6502 1 2 3 5 v cc gnd 4 5-pin sot-23a note: 5-pin sot-23a is equivalent to eiaj sc-74a notes: tc6501 and tc6502 are offered in 3 standard temperature settings. other non-standard versions are available (including 55 c, 75 c, 85 c, 105 c and 115 c), please contact factory for more information. tc6503 and tc6504 are offered in 2 standard temperature settings. other non- standard versions are available (including -45 c, -35 c, -25 c and -5 c), please contact factory for more information. a letter p in the part number indicates a positive temperature sign or n for a negative temperature sign. ordering information part no package standard temp. threshhold output stage tc6501p045vct 5-pin sot-23a 45 c open drain tc6501p065vct 5-pin sot-23a 65 c open drain tc6501p095vct 5-pin sot-23a 95 c open drain tc6502p045vct 5-pin sot-23a 45 c push/pull tc6502p065vct 5-pin sot-23a 65 c push/pull tc6502p095vct 5-pin sot-23a 95 c push/pull tc6503n015vct 5-pin sot-23a -15 c open drain TC6503P005VCT 5-pin sot-23a 5 c open drain tc6504n015vct 5-pin sot-23a -15 c push/pull tc6504p005vct 5-pin sot-23a 5 c push/pull
2 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a absolute maximum ratings* supply voltage (v cc ) ................................... 0.3v to +7v tover (tc6501) ......................................... 0.3v to +7v tover (tc6502) ........................... 0.3v to (v cc + 0.3v) tunder (tc6503) ........................................ 0.3v to 7v tunder (tc6504) ........................ 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 operating temperature range ............. 55 c to +125 c storage temperature range ................ 65 c to +165 c lead temperature (soldering, 10 sec) ................. +300 c power dissipation (t a = +70 c) (derate 7.1mw/ c above +70 c) ...................571mw *static-sensitive 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 perma- nent damage to the device. these are stress ratings only and functional operation of the device at these or any other conditions above 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: v cc = +2.7v to +5.5v, r pull-up = 100k ? (tc6501/tc6503 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. symbol parameter test conditions min typ max unit v cc supply voltage range 2.7 5.5 v i cc supply current 17 40 a ? t th temperature threshold accuracy 45 c to 25 c 6 0.5 6 c (note 1) 15 c to +15 c 4 0.5 4 +35 c to +65 c 4 0.5 4 +75 c to +115 c 6 0.5 6 t hyst temperature threshold hysteresis hyst = gnd 2 c hyst = v cc 10 v ih hyst input threshold 0.8 x v cc v v il hyst input threshold 0.2 x v cc v v oh output voltage high i source = 500 a, v cc > 2.7v 0.8 x v cc v (tc6502/tc6504 only) i source = 800 a, v cc > 4.5v v cc 1.5 v (tc6502/tc6504 only) v ol output voltage low i sink = 1.2ma, v cc > 2.7v 0.3 v i sink = 3.2ma, v cc > 4.5v 0.4 v open-drain output leakage v cc = 2.7v, v tunder = 5.5v 10 na current (tc6503); v tover = 5.5v (tc6501) notes: 1. the tc6501 through tc6504 are available with internal, factory-programmed temperature trip thresholds from 45 c to +115 c in +10 c increments.
3 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a pin description tc6501 tc6502 tc6503 tc6504 name description 1,2 1,2 1,2 1,2 gnd ground. ground both pins together close to the chip. pin 2 provides the lowest thermal resistance to the die. 3333 hyst hysteresis input. connect hyst to gnd for +2 c hysteresis, or connect to v cc for +10 c hysteresis. 4444 v cc supply input (+2.7v to +5.5v). recommend 100pf or greater coupling capacitor fom v cc to gnd . 5 tover open-drain, active-low output. tover goes low when the die tempera- ture exceeds the factory-programmed temperature threshold. connect to a 100 k ? pull-up resistor. may be pulled up to a voltage higher than v cc . 5 tover push/pull active-high output. tover goes high when the die tempera- ture exceeds the factory-programmed temperature threshold. 5 tunder open-drain, active-low output. tunder goes low when the die temp- erature goes below the factory-programmed temperature threshold. connect to a 100 k ? pull-up 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 tempera- ture is below the factory-programmed temperature threshold. detailed description the tc6501 through tc6504 integrate a temperature sensor with a factory programmed 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 tc6501 and tc6502 are intended for a temperature range from 35 c to 115 c in a 10 c increment. the tc6501 has an open drain output and the tc6502 has a push /pull output stage. the tc6503 and tc6504 are intended for a cold temperature range from 45 c to +15 c in a 10 c incre- ment. the tc6503 has an open drain output and the tc6504 has a push/pull output stage. the tc6501 and typical operating circuit gnd gnd hyst +2.7v to +5.5v v cc int p tover v cc tc6502 gnd 100pf tc6503 are intended for applications with a microprocessor reset input. the tc6502 and tc6504 are intended for applications of turning on a fan or heater element. hysteresis input to prevent the output from chattering 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. factory-programmed threshold range part number threshold (t th ) range tc6501 +35 c < t th < +115 c tc6502 +35 c < t th < +115 c tc6503 45 c < t th < +15 c tc6504 45 c < t th < +15 c thermal considerations with a very low 17 a supply current, the tc6501 through tc6504 dissipates very little power. thus, the die temperature is basically the same as the package tempera- ture. 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 5-pin sot-23a package is 140 c/w. if for instance the tc6501 had to sink
4 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a 1ma, and the output voltage is guaranteed to be less than 0.3v, then an additional 0.3mw of power is dissipated within the ic. this corresponds to a 0.042 c rise in die tempera- ture in the 5-pin sot-23a. temperature monitoring accuracy depends on the ther- mal 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 tc6501 through tc6504 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 5-pin sot-23a package can be placed directly under the socketed microprocessor for improved thermal contact. applications the tc6501 and tc6503 have open drain outputs and are therefore intended to interface as microprocessor reset inputs. moreover, the combination of these two devices can be used to implement a temperature window alarm by wire- oring the outputs and using an external pull up resistor. (see figure 1) the tc6502 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 tc6502 with a higher temperature threshold to alert the user of an impending thermal shutdown, should the temperature continue to rise. (see figure 2) the tc6504 with its push/pull output could be used in a similar fashion to turn on a heater element at cold tempera- tures. (see figure 3) figure 1. over and under temperature alarm heat gnd gnd 100pf 100pf hyst +5v p tover v cc tc6502po65 heat gnd gnd hyst tover v cc tc6502po45 temperature fault fan control hyst v cc gnd gnd hyst tunder tc6501 +5v temperature out of range r pull-up 100k gnd gnd v cc tover tc6501 tc6503 hyst 100pf 100pf figure 2. fan control circuit with over temperature alert figure 3. tc6504n005 as heater thermostat heater "on" tunder tunder tunder + 2 c tc6504n005 +5v 12v gnd gnd hyst v cc heater asic or f tunder 100pf
5 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a figure 4. functional block diagrams + positive tempco reference negative tempco reference hyst network hyst tc6501 temp tc6501 with 100 k ? pull-up cold +25 ct th hot tover + positive tempco reference negative tempco reference hyst network hyst tc6502 v tover temp tc6502 cold +25 ct th hot tover v tover + positive tempco reference negative tempco reference hyst network hyst tc6503 temp tc6503 with 100 k ? pull-up cold t th hot tunder v tunder +25 c + positive tempco reference negative tempco reference hyst network hyst tc6504 v tunder temp tc6504 cold t th hot tunder +25 c
6 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a typical characteristics curves trip temperature ( c) hysteresis ( c) hysteresis vs. trip temperature output sink resistance vs. temperature 5 3 4 1 21 03 25 4 accuracy ( c) 60 40 20 0 20 40 tc6502 output source resistance vs. temperature temperature ( c) 60 50 40 30 20 10 0 frequency trip threshold accuracy supply current ( a) supply current vs. temperature 40 35 30 25 20 15 10 5 0 0 20 40 60 80 100 temperature ( c) output source resistance ( ? ) 180 160 140 120 100 80 60 180 40 20 60 80 100 120140 140 120 01020304050 temperature ( c) output sink resistance ( ? ) 80 70 60 50 40 30 20 10 0 60 70 80 90 100 45 12 10 8 6 4 2 0 25 5 15 35 55 75 95 115 v cc = 2.7v v cc = 4.0v v cc = 5.0v v cc = 2.7v v cc = 4.0v v cc = 5.0v hys = gnd hys = v cc tc6503/04 tc6503/04 tc6501/02 tc6501/02 sot-23 thermal step response in perfluorinated fluid sot-23 thermal step response in still air +15 c/div +100 c +25 c 5sec/div mounted on 0.75 in 2 of 2 oz. copper +12.5 c/div +100 c +25 c 20sec/div mounted on 0.75 in 2 of 2 oz. copper
7 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a taping form user direction of feed user direction of feed device marking component taping orientation for 5-pin sot-23a (eiaj sc-74a) devices device marking pin 1 pin 1 standard reel component orientation tr suffix device (mark right side up) reverse reel component orientation rt suffix device (mark upside down) w = width of carrier tape p = pitch package carrier width (w) pitch (p) part per full reel reel size 5-pin sot-23a 8 mm 4 mm 3000 7 in carrier tape, reel size, and number of components per reel 5-pin sot-23a marking part numbers and part marking part number code tc6501p045vct ha tc6501p065vct hc tc6501p095vct hf tc6502p045vct ja tc6502p065vct jc tc6502p095vct jf tc6503n015vct ka TC6503P005VCT kb tc6504n015vct la tc6504p005vct lb ex: 6501p045vct = h a represents year and two-month period code represents lot id number & = two letter part number codes
8 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a package dimensions dimensions: inches (mm) 5-pin sot-23a (eiaj sc-74a) .071 (1.80) .059 (1.50) .122 (3.10) .098 (2.50) .075 (1.90) reference .020 (0.50) .012 (0.30) .037 (0.95) reference .122 (3.10) .106 (2.70) .057 (1.45) .035 (0.90) .006 (0.15) .000 (0.00) .022 (0.55) .008 (0.20) 10 max. .010 (0.25) .004 (0.09)
9 tc6501 tc6502 tc6503 tc6504 tc6501/2/3/4-1 2/25/00 ultra small temperature switch with pin-selectable hysteresis ? 2001 microchip technology inc. ds21451a information contained in this publication regarding device applications and the like is intended through suggestion only and ma y be superseded by updates. it is your responsibility to ensure that your application meets with your specifications. no representation or warrant y is given and no liability is assumed by microchip technology incorporated with respect to the accuracy or use of such information, or infringement of patent s or other intellectual property rights arising from such use or otherwise. use of microchip ? s products as critical components in life support systems is not authorized except with express written approval by microchip. no licenses are conveyed, implicitly or otherwise, except as maybe explicitly expressed herein, under any intellec- tual property rights. the microchip logo and name are registered trademarks of microchip technology inc. in the u.s.a. and othe r countries. all rights reserved. all other trademarks mentioned herein are the property of their respective companies. all rights reserved. ? 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