19-1280; Rev 6; 2/11 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 ____________________________Features The MAX6501-MAX6504 low-cost, fully integrated temperature 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 -45C to +125C in 10C increments, and are accurate to 0.5C (typ) or 6C (max). These devices require no external components and typically consume 30A supply current. Hysteresis is pin-selectable at 2C or 10C. The MAX6501/MAX6503 have an active-low, open-drain output intended to interface with a microprocessor (P) reset input. The MAX6502/MAX6504 have an activehigh, push-pull output intended to directly drive fancontrol logic. The MAX6501/MAX6502 are offered with hot-temperature thresholds (+35C to +125C), asserting when the temperature is above the threshold. The MAX6503/MAX6504 are offered with cold-temperature thresholds (-45C to +15C), asserting when the temperature is below the threshold. The MAX6501-MAX6504 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. 0.5C (typical) Threshold Accuracy Over Full Temperature Range Typical Operating Circuit +2.7V TO +5.5V VCC VCC MAX6502 TOVER GND GND HYST INT No External Components Required Low Cost 30A 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 Ordering Information PART TEMP RANGE PIN-PACKAGE MAX6501UK_ _ _ _+T -55C to +125C 5 SOT23 MAX6502UK_ _ _ _+T -55C to +125C 5 SOT23 MAX6503UK_ _ _ _+T -55C to +125C 5 SOT23 MAX6504UK_ _ _ _+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 +65C 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 P GND P Temperature Monitoring in High-Speed Computers Temperature Control Temperature Alarms Fan Control Selector Guide and Pin Configurations appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. 1 MAX6501-MAX6504 ________________General Description MAX6501-MAX6504 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) Range....................................-0.3V to +7V TOVER (MAX6501) ...................................................-0.3V to +7V TOVER (MAX6502) .....................................-0.3V to (VCC + 0.3V) TUNDER (MAX6503) ................................................-0.3V to +7V TUNDER (MAX6504) ..................................-0.3V to (VCC + 0.3V) All Other Pins..............................................-0.3V to (VCC + 0.3V) Input Current (all pins) ........................................................20mA Output Current (all pins) .....................................................20mA Continuous Power Dissipation (TA = +70C) SOT23 (derate 3.1mW/C above +70C) ......................247mW Operating Temperature Range .........................-55C to +135C Storage Temperature Range .............................-65C to +165C Lead Temperature (soldering, 10s) .................................+300C Soldering Temperature (reflow) .......................................+260C 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 (VCC = +2.7V to +5.5V, RPULLUP = 100k (MAX6501/MAX6503 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25C.) (Note 1) PARAMETER SYMBOL Supply Voltage Range VCC Supply Current ICC Temperature Threshold Accuracy (Note 2) Temperature Threshold Hysteresis HYST Input Threshold (Note 3) Output Voltage High Output Voltage Low Open-Drain Output Leakage Current TTH THYST CONDITIONS MIN TYP 2.7 V 30 85 A -6 0.5 +6 -15C to +15C -4 0.5 +4 +35C to +65C -4 0.5 +4 +75C to +125C -6 0.5 +6 HYST = GND 2 HYST = VCC 10 VOL 0.2 x VCC 0.8 x VCC ISOURCE = 800A, VCC > 4.5V (MAX6502/MAX6504 only) VCC - 1.5 V V ISINK = 1.2mA, VCC > 2.7V 0.3 ISINK = 3.2mA, VCC > 4.5V 0.4 VCC = 2.7V, VTUNDER = 5.5V (MAX6503), VTOVER = 5.5V (MAX6501) C C 0.8 x VCC VIL ISOURCE = 500A, VCC > 2.7V (MAX6502/MAX6504 only) UNITS 5.5 -45C to -25C VIH VOH MAX 10 V nA Note 1: 100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. Note 2: The MAX6501-MAX6504 are available with internal, factory-programmed temperature trip thresholds from -45C to +125C in +10C increments (see Selector Guide). Note 3: Guaranteed by design. 2 _______________________________________________________________________________________ Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 MAX6501-MAX6504 __________________________________________Typical Operating Characteristics (VCC = +5V, RPULLUP = 100k (MAX6501/MAX6503), TA = +25C, unless otherwise noted.) 40 30 20 10 30 OUTPUT SOURCE RESISTANCE () 35 SUPPLY CURRENT (A) 50 800 MAX6501 TOC01 40 MAX6501 TOC-A PERCENTAGE OF PARTS SAMPLED (%) SAMPLE SIZE = 300 25 20 15 10 5 0 -3 -2 -1 0 1 2 3 4 5 600 500 400 300 VCC = 5.0V 200 -25 5 35 65 95 125 -55 TEMPERATURE (C) OUTPUT SINK RESISTANCE vs. TEMPERATURE VCC = 3.3V 0 -55 ACCURACY (C) VCC = 2.7V 700 100 0 -5 -4 -25 5 35 65 125 SOT23 THERMAL STEP RESPONSE IN STILL AIR MAX6501 TOC5 MAX6501 TOC4 MAX6501 TOC03 VCC = 2.7V 140 95 TEMPERATURE (C) SOT23 THERMAL STEP RESPONSE IN PERFLUORINATED FLUID 160 MAX6501 TOC02 TRIP THRESHOLD ACCURACY 60 OUTPUT SINK RESISTANCE () MAX6502/MAX6504 OUTPUT SOURCE RESISTANCE vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE +100C +100C 120 100 VCC = 3.3V 80 +12.5C/div +15C/div VCC = 5.0V 60 MOUNTED ON 0.75in2 OF 2 oz. COPPER 40 20 MOUNTED ON 0.75in2 OF 2 oz. COPPER +25C +25C 0 -55 -25 5 35 65 95 125 20sec/div 5sec/div TEMPERATURE (C) MAX6501 STARTUP AND POWER-DOWN (T < TTH) HYSTERESIS vs. TRIP TEMPERATURE MAX6501 TOC07 MAX6503 MAX6504 HYST = VCC HYSTERESIS (C) 12 MAX6501 TOC8 16 14 MAX6501 STARTUP DELAY (T > TTH) MAX6501 MAX6502 HYST = VCC MAX6501 TOC07A A A 10 8 6 MAX6501 MAX6502 HYST = GND MAX6503 MAX6504 HYST = GND 4 2 0 -45 -25 -5 15 35 55 75 TRIP TEMPERATURE (C) 95 B B 115 TRACE A: TOVER VOLTAGE, RPULLUP = 100k TRACE B: VCC PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT TRACE A: TOVER VOLTAGE, RPULLUP = 100k TRACE B: VCC PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT _______________________________________________________________________________________ 3 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 MAX6501-MAX6504 Pin Description PIN NAME MAX6502 MAX6503 MAX6504 1, 2 1, 2 1, 2 1, 2 GND Ground. Not internally connected. Connect both ground pins together close to the chip. Pin 2 provides the lowest thermal resistance to the die. 3 3 3 3 HYST Hysteresis Input. Connect HYST to GND for 2C hysteresis, or connect to VCC for 10C hysteresis. 4 4 4 4 VCC 5 -- -- -- TOVER Open-Drain, Active-Low Output. TOVER goes low when the die temperature exceeds the factory-programmed temperature threshold. Connect to a 100k pullup resistor. May be pulled up to a voltage higher than VCC. -- 5 -- -- TOVER Push-Pull Active-High Output. TOVER goes high when the die temperature exceeds the factory-programmed temperature threshold. Supply Input (+2.7V to +5.5V) -- -- 5 -- TUNDER Open-Drain, Active-Low Output. TUNDER goes low when the die temperature goes below the factory-programmed temperature threshold. Connect to a 100k pullup resistor. May be pulled up to a voltage higher than VCC. -- -- -- 5 TUNDER Push-Pull Active-High Output. TUNDER goes high when the die temperature falls below the factory-programmed temperature threshold. ________________General Description The MAX6501-MAX6504 fully integrated temperature switches incorporate two temperature-dependent references and a comparator. One reference exhibits a positive 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 2C or 10C hysteresis keeps the output from oscillating when the die temperature approaches the threshold temperature. The MAX6501/MAX6503 have an active-low, opendrain output structure that can only sink current. The MAX6502/MAX6504 have an active-high, push-pull output structure that can sink or source current. The internal power-on reset circuit guarantees the output is at TTH = +25C state at startup for 50s. The MAX6501-MAX6504 are available with factorypreset temperature thresholds from -45C to +125C in 10C increments. Table 1 lists the available temperature threshold ranges. The MAX6501/MAX6503 outputs are intended to interface with a microprocessor (P) reset input (Figure 2). The MAX6502/MAX6504 outputs are intended for applications such as driving a fan control (Figure 3). 4 FUNCTION MAX6501 Table 1. Factory-Programmed Threshold Range PART THRESHOLD (TTH) RANGE MAX6501 +35C < TTH < +125C MAX6502 +35C < TTH < +125C MAX6503 -45C < TTH < +15C MAX6504 -45C < TTH < +15C Hysteresis Input The HYST pin is a CMOS-compatible input that selects hysteresis at either a high level (10C for HYST = VCC) or a low level (2C for HYST = GND). Hysteresis prevents 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 VCC. Other input voltages cause increased supply current. The actual amount of hysteresis depends on the part's programmed trip threshold (see the Typical Operating Characteristics). _______________________________________________________________________________________ Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 V TOVER MAX6501-MAX6504 TOVER MAX6501 WITH 100k PULLUP POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD +25C TTH HOT TEMP MAX6501 MAX6502 V TOVER TOVER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD +25C TTH HOT TEMP MAX6502 TUNDER MAX6503 WITH 100k PULLUP V TUNDER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD TTH +25C HOT TEMP MAX6503 V TUNDER MAX6504 TUNDER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD TTH +25C HOT TEMP MAX6504 Figure 1. Block and Functional Diagrams _______________________________________________________________________________________ 5 MAX6501-MAX6504 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 +3.3V +5V VCC VCC RPULLUP 100k P P MAX6501 INT SHUTDOWN OR RESET TOVER HEAT HYST HYST HEAT MAX6502 FAN GND GND TOVER GND GND Figure 2. Microprocessor Alarm/Reset Applications Information Thermal Considerations The MAX6501-MAX6504 supply current is typically 30A. 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 monitoring 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 P, allowing the device to monitor the P's temperature directly. Use the monitor's output to reset the P, assert an interrupt, or trigger an external alarm. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the MAX6501-MAX6504 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: TJ = PDISSIPATION x JA where P DISSIPATION is the power dissipated by the MAX6501-MAX6504, and JA is the package's thermal resistance. The typical thermal resistance is 140C/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 additional 0.3mW of power is dissipated within the IC. This corresponds to a 0.042C shift in the die temperature in the SOT23. 6 VCC VCC Figure 3. Overtemperature Fan Control Temperature-Window Alarm The MAX6501-MAX6504 temperature switch outputs assert when the die temperature is outside the factoryprogrammed 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 containing 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 thermal out-of-range alarm. More favorably, a MAX6501/ MAX6503 can be directly wire-ORed with a single external 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's temperature falls out of the -5C to +75C range. The thermal-overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperaturedependent function. Low-Cost, Fail-Safe Temperature Monitor In high-performance/high-reliability applications, multiple temperature monitoring is important. The high-level integration and low cost of the MAX6501-MAX6504 facilitate the use of multiple temperature monitors to increase system reliability. Figure 5's application uses two MAX6502s with different temperature thresholds to ensure that fault conditions that can overheat the monitored device cause no permanent damage. The first temperature monitor activates the fan when the die temperature exceeds +45C. The second MAX6502 triggers a system shutdown if the die temperature reaches +75C. The second temperature monitor's output asserts when a wide variety of destructive fault conditions occur, including latchups, short circuits, and cooling-system failures. _______________________________________________________________________________________ Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 MAX6501-MAX6504 +5V +5V VCC VCC MAX6502_ _P075 GND GND HEAT OVERTEMP HYST TOVER OUT OF RANGE VCC MAX6502_ _P075 GND GND HYST TEMPERATURE FAULT TOVER P TUNDER UNDERTEMP MAX6504_ _N005 FAN CONTROL HYST GND HEAT GND VCC TOVER HYST MAX6502_ _P045 +5V RPULL-UP 100k GND OUT OF RANGE GND VCC VCC TOVER TUNDER MAX6501_ _P075 Figure 5. Low-Power, High-Reliability, Fail-Safe Temperature Monitor MAX6503_ _N005 GND GND GND HYST GND HYST Figure 4. Temperature-Window Alarms Table 2. Device Marking Codes DEVICE MAX6501UKP035 MAX6501UKP045 MAX6501UKP055 MAX6501UKP065 MAX6501UKP075 MAX6501UKP085 MAX6501UKP095 MAX6501UKP105 MAX6501UKP115 MAX6501UKP125 MAX6502UKP035 MAX6502UKP045 MAX6502UKP055 MAX6502UKP065 MAX6502UKP075 MAX6502UKP085 MAX6502UKP095 CODE MINIMUM ORDER ABZF ABZR ACFW ABZS ACFV ACDP ABZT ACFU ACAG ADQK ABZG ABZU ACGC ABZV ACGB ACGA ABZW 10k 2.5k 2.5k 2.5k 2.5k 2.5k 2.5k 10k 2.5k 25k 10k 2.5k 2.5k 2.5k 2.5k 2.5k 2.5k DEVICE CODE MINIMUM ORDER MAX6502UKP105 ACFZ 10k MAX6502UKP115 MAX6502UKP125 ACFY ADUD 2.5k 25k MAX6503UKN045 ADIZ 10k MAX6503UKN035 MAX6503UKN025 MAX6503UKN015 MAX6503UKN005 MAX6503UKP005 MAX6503UKP015 MAX6504UKN045 ADVS ADVR ACFX ADNZ ABZX ADPN ACAX 10k 10k 2.5k 10k 2.5k 10k 10k MAX6504UKN035 MAX6504UKN025 MAX6504UKN015 MAX6504UKN005 MAX6504UKP005 MAX6504UKP015 ADVU ADVT ACGD ADVX ABZY ADKE 10k 10k 2.5k 10k 2.5k 10k _______________________________________________________________________________________ 7 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 MAX6501-MAX6504 Selector Guide PART MAX6501 MAX6502 MAX6503 MAX6504 TOP VIEW OUTPUT STAGE OpenDrain Push-Pull OpenDrain Push-Pull TRIP TEMP THRESHOLD Hot Hot Cold Cold -45 -35 -25 -15 -5 +5 +15 STANDARD TEMPERATURE THRESHOLDS (C) 8 Pin Configurations +35 +45 +55 +65 +75 +85 +95 +105 +115 +125 GND 1 GND 2 5 TOVER GND 1 (TOVER) MAX6501 MAX6502 HYST 3 GND 2 4 VCC 5 TUNDER (TUNDER) MAX6503 MAX6504 HYST 3 SOT23 4 VCC SOT23 ( ) ARE FOR MAX6502. ( ) ARE FOR MAX6504. 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. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 5 SOT23 U5+2 21-0057 90-0174 _______________________________________________________________________________________ Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 REVISION NUMBER REVISION DATE 5 10/06 6 2/11 DESCRIPTION In Table 2 updated the device marking codes for MAX6503UKN035, MAX6503UKN025, MAX6503UKN005, MAX6503UKP015, MAX6504UKN035, MAX6504UKN025, and MAX6504UKN005 Removed the TO-220 package from entire data sheet; changed all leaded parts to lead(Pb)-free parts in the Ordering Information table; in the Absolute Maximum 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 PAGES CHANGED 7 All 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) 2011 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX6501-MAX6504 Revision History Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX6501UKP115+T