19-1712; Rev 1; 4/00 Dual Trip SOT Temperature Switches ________________________Applications µP Temperature Monitoring in High-Speed Computers Temperature Control Features ♦ ±0.5°C (typ) Threshold Accuracy Over Full Temperature Range ♦ No External Components Required ♦ Low Cost ♦ 30µA (typ) Supply Current ♦ Factory-Programmed Thresholds from -40°C to +125°C in 5°C Increments ♦ Open-Drain Outputs (MAX6505/MAX6507), Push-Pull Outputs (MAX6506/MAX6508) ♦ Pin Selectable +2°C, +10°C Hysteresis (MAX6507/MAX6508) ♦ Pin Selectable +5°C, +10°C, +20°C, +30°C TALARM - TWARN (MAX6505/MAX6506) ♦ SOT23-6 Package Ordering Information TEMP. RANGE PART PINPACKAGE MAX6505UT_ _ _ _-T* -40°C to +125°C 6 SOT23-6 MAX6506UT_ _ _ _-T* -40°C to +125°C 6 SOT23-6 MAX6507UT_ _ _ _-T** -40°C to +125°C 6 SOT23-6 MAX6508UT_ _ _ _-T** -40°C to +125°C 6 SOT23-6 *To complete the suffix information for the MAX6505/ MAX6506, add P or N for positive or negative trip temperature, and select an available trip point in degrees centigrade. For example, the MAX6505UTP055-T describes a MAX6505 in a SOT23-6 package with a +55°C threshold (Table 3). Contact the factory for pricing and availability of temperature versions (minimum order 10,000 pieces). Temperature Alarms **To complete the suffix information for MAX6507/MAX6508, see Table 4. Fan Control Selector Guide appears at end of data sheet. Typical Operating Circuits appear at end of data sheet. Pin Configurations TOP VIEW WARN (WARN) 1 GND 2 MAX6505 MAX6506 S1 3 ( ) ARE FOR MAX6506. SOT23-6 6 ALARM (ALARM) OK (OK) 1 5 S0 GND 2 4 VCC MAX6507 MAX6508 S0 3 SOT23-6 6 OVER (OVER) 5 N.C. 4 VCC ( ) ARE FOR MAX6508. ________________________________________________________________ Maxim Integrated Products 1 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX6505–MAX6508 General Description The MAX6505–MAX6508 temperature switches have dual logic outputs that assert when the die temperature crosses their trip thresholds. Trip thresholds are factory programmed to convenient temperatures in 5°C increments. The MAX6505/MAX6506 have an ALARM output that asserts when the temperature is above the factory-programmed thresholds (available from -40°C to +125°C). They also have a WARN output that asserts when the temperature is several degrees below the ALARM threshold. The difference between the ALARM and WARN thresholds (∆TAW) is pin selectable to +5°C, +10°C, +20°C, or +30°C. The MAX6505’s logic outputs are open drain, while the MAX6506’s logic outputs are push-pull. The MAX6507 has open-drain outputs (OVER, OK), and the MAX6508 has push-pull outputs (OVER, OK), each with two factory-programmed threshold temperatures (TOVER and TUNDER) in the wide range of -40°C to +125°C. The overtemperature output asserts when the temperature is above TOVER. When the temperature is in the desired window (less than TOVER and greater than TUNDER), OK (OK) asserts. The MAX6505–MAX6508 are accurate to ±0.5°C (typ), ±5.5°C (max). Operating from a +2.5V to +5.5V supply, these low-cost devices typically consume 30µA supply current and require no external components for setting trip points. The MAX6505–MAX6508 are available in a 6pin SOT23 package. MAX6505–MAX6508 Dual Trip SOT Temperature Switches ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC to GND) ..................................-0.3V to +6V S1, S0 to GND ............................................-0.3V to (VCC + 0.3V) All Other Pins to GND.................................-0.3V to (VCC + 0.3V) Input/Output Current, All Pins...........................................±20mA Continuous Power Dissipation (TA = +70°C) 6-Pin SOT23 (derate 7.1mW/°C above +70°C)...........571mW Operating Temperature Range (TMIN to TMAX) ..............................................-40°C to +125°C Thermal Resistance (ΘJA)..............................................115°C/W Storage Temperature Range .............................-65°C to +150°C Maximum Die Temperature..............................................+150°C Lead Temperature (soldering, 10s) .................................+300°C 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 = +2.5V to +5.5V, RPULLUP = 100kΩ (MAX6505/MAX6507 only), TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = +5V, unless otherwise noted.) (Note 1) PARAMETER Supply Voltage Range Supply Current Temperature Threshold Accuracy (Note 2) Delta Temperature (TALARM -TWARNING) MAX6505/MAX6506 Temperature Threshold Hysteresis (Note 3) SYMBOL CONDITIONS VCC S0 = S1 = GND MAX6505/ MAX6506 40 S0 = GND MAX6507/ MAX6508 30 Output Voltage Low 2 80 60 -5.5 ±0.5 5.5 -3.5 ±0.5 3.5 -4 ±0.5 4 S1 = GND, S0 = GND 5 S1 = GND, S0 = VCC 10 S1 = VCC, S0 = GND 20 S1 = VCC, S0 = VCC 30 ALARM (MAX6505/MAX6506) 2 WARN (MAX6505/MAX6506) THYST ∆TAW = 5°C or 10°C 5 ∆TAW = 20°C or 30°C 10 S0 = GND 2 S0 = VCC 10 °C °C °C 0.8 x VCC VIH V 0.8 ISOURCE = 500µA, VCC > 2.5V 0.8 x VCC ISOURCE = 800µA,VCC > 4.5V VCC -1.5 VOH VOL V µA VIL Output Voltage High (MAX6506/MAX6508) UNITS 5.5 0°C to +95° C OK, OVER (MAX6507/MAX6508) Logic Input Levels (S1, S0) MAX -40°C to 0° C +95°C to +125 ° C ∆TAW TYP 2.5 ICC ∆TTH MIN V ISINK = 3.2mA, VCC > 2.5V 0.5 ISINK = 5mA, VCC > 4.5V 0.5 _______________________________________________________________________________________ V Dual Trip SOT Temperature Switches (VCC = +2.5V to +5.5V, RPULLUP = 100kΩ (MAX6505/MAX6507 only), TA = -40°C to +125°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = +5V, unless otherwise noted.) (Note 1) PARAMETER SYMBOL Open-Drain Output Leakage Current Note 1: Note 2: Note 3: CONDITIONS MIN TYP MAX VCC = 5.5V, VALARM = 5.5V, VWARN = 5.5V (MAX6505) 1 VCC = 5.5V, VOK = 5.5V, VOVER = 5.5V (MAX6507) 1 UNITS µA 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. TALARM, TUNDER, and TOVER are factory-programmed temperature trip thresholds from -40°C to +125°C in 5°C increments. Temperature threshold hysteresis is defined as the difference from positive-going temperature thresholds minus the negative-going temperature thresholds. Typical Operating Characteristics (VCC = +5V, unless otherwise noted.) SUPPLY CURRENT vs. TEMPERATURE 30 0 TRIP-POINT ERROR (%) 35 1.5 1.0 MAX6505/8-03 VCC = +5V RPULLUP = 100kΩ 2.0 40 0.1 MAX6505/8-02 VCC = +5V RPULLUP = 100kΩ HYSTERESIS (°C) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 25 NORMALIZED TO TRIP-POINT TEMPERATURE AT VCC = +5V -0.7 -0.8 0.5 20 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (°C) TEMPERATURE (°C) 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) MAX6505 STARTUP DELAY (T > TTH) MAX6505/8-05 MAX6505 STARTUP AND POWER-DOWN (T < TTH) 2.5 MAX6505/8-04 SUPPLY CURRENT (µA) 45 2.5 MAX6505/8-01 50 TRIP-POINT ERROR (%) vs. SUPPLY VOLTAGE HYSTERESIS vs. TRIP TEMPERATURE A A 2V/div 2V/div B B 100µs/div A: VCC PULSE B: ALARM VOLTAGE, RPULLUP = 100kΩ 100µs/div A: VCC PULSE B: ALARM VOLTAGE, RPULLUP = 100kΩ _______________________________________________________________________________________ 3 MAX6505–MAX6508 ELECTRICAL CHARACTERISTICS (continued) Dual Trip SOT Temperature Switches MAX6505–MAX6508 Pin Description PIN MAX6505 MAX6506 1 FUNCTION MAX6508 -— -— WARN Open-Drain Active-Low Warning Output. WARN goes low when the die temperature exceeds TWARN = TALARM ∆TAW. Push-Pull Active-High Warning Output. WARN goes high when the die temperature exceeds TWARN = TALARM ∆TAW. -— 1 -— -— WARN 2 2 2 2 GND 3, 5 3, 5 -— -— S1, S0 -— -— 3 3 S0 4 4 4 4 VCC Supply Voltage Input. Bypass VCC to GND with a 0.1µF ceramic capacitor. -— -— 5 5 N.C. No Connection. Not internally connected. -— -— 6 -— OVER -— -— _ 6 OVER -— 4 NAME MAX6507 -— 1 -— Ground Delta Temperature Select Input. Connect to VCC or GND to select the difference between TALARM and TWARN (Table 1 or see Electrical Characteristics). Hysteresis Select Input. Connect to VCC for 10°C hysteresis. Connect to GND for 2°C hysteresis. Open-Drain Active-Low Overtemperature Output. OVER goes low when the die temperature exceeds the factoryset value of TOVER. Push-Pull Active-High Overtemperature Output. OVER goes high when the die temperature exceeds the factoryset value of TOVER. OK Open-Drain Active-High Temperature Sensor Output. OK goes high impedance when the die temperature is between the factory-set values of TOVER and TUNDER. When the die temperature is above TOVER or below TUNDER, OK goes low. OK Push-Pull Active-Low Temperature Sensor Output. OK goes low when the die temperature is between the factoryset values of TOVER and TUNDER. When the die temperature is above TOVER or below TUNDER, OK goes high. -— -— -— 6 -— -— -— ALARM Open-Drain Active-Low Alarm Output. ALARM goes low when the die temperature exceeds the factory-set value of TALARM. -— 6 -— -— ALARM Push-Pull Active-High Alarm Output. ALARM goes high when the die temperature exceeds the factory-set value of TALARM. 1 _______________________________________________________________________________________ Dual Trip SOT Temperature Switches The MAX6507/MAX6508 have two factory-programmed threshold temperatures (TOVER and TUNDER) and two outputs (OK and OVER). One output (OK) asserts when the temperature is between TOVER and TUNDER. The other output (OVER) asserts when the temperature is above TOVER. Table 4 shows the hex codes to determine the part numbers associated with specific values of TOVER and TUNDER. The first hex code indicates the lower trip point (TUNDER) and the second indicates the higher trip point (TOVER). For example, a part with TUNDER = -10°C and TOVER = +75°C will have the part number MAX6508UTA04B (Table 4 and Figure 2). MAX6507 has open-drain outputs; MAX6508 has pushpull outputs. Hysteresis Selection The temperature threshold hysteresis for the ALARM output of the MAX6505/MAX6506 is 2°C. The hysteresis for the WARN output depends on the value of ∆TAW. If ∆TAW is 5°C or 10°C (set by S0 and S1), WARN hysteresis is 5°C. If ∆TAW is 20°C or 30°C, WARN hysteresis is 10°C. MAX6507 and MAX6508 have pin-selectable hysteresis of 2°C or 10°C for both OVER and OK outputs (Table 2). Applications Information Thermal Considerations The MAX6505–MAX6508 supply current is typically 30µA. 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 MAX6505– MAX6508 package and the device being monitored. In Table 1. MAX6505/MAX6506 ∆TAW Selection Table CONTROL PINS DESCRIPTION S0 S1 ∆TAW =TALARM – TWARN (°C) GND GND 5 GND VCC 10 VCC GND 20 VCC VCC 30 HYSTERESIS ≈ 2°C 65°C 55°C HYSTERESIS ≈ 5°C WARN ALARM Figure 1. Temperature Response—MAX6505UTP065 Outputs, ∆TAW = 10°C, and WARN Hysteresis ≈ 5°C some applications, the SOT23-6 packages may be small enough to fit underneath a socketed microprocessor (µP), allowing the device to monitor the µP’s temperature directly. Use the monitor’s output to reset the µP, assert an interrupt, or trigger an external alarm. Accurate temperature monitoring depends on the thermal resistance between the device being monitored and the MAX6505–MAX6508 die. The rise in die temperature due to self-heating is given by the following formula: ∆TJ = PDISSIPATION ✕ θJA where P DISSIPATION is the power dissipated by the MAX6505–MAX6508, and θJA is the package’s thermal resistance. The typical thermal resistance is +115°C/W for the SOT23-6 package. To limit the effects of self-heating, minimize the output currents. For example, if the MAX6505 sinks 5mA, the output voltage is guaranteed to be less than 0.5V. Therefore, an additional 2.5mW of _______________________________________________________________________________________ 5 MAX6505–MAX6508 _______________Detailed Description The MAX6505–MAX6508 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. The temperature at which the two reference voltages are equal determines the temperature trip point. There are two versions, each of which has two logic outputs. The MAX6505/MAX6506 have a main trip point (TALARM) and a lower, “warning” trip point (TWARN). When the die temperature rises above these trip points, the ALARM and WARN outputs are asserted (Figure 1). The difference between the two trip points (∆TAW) is pin selectable to +5°C, +10°C, +20°C, or +30°C by connecting the two control pins (S0 and S1) high or low (Table 1). MAX6505 has open-drain active-low outputs; MAX6506 has push-pull active-high outputs. MAX6505–MAX6508 Dual Trip SOT Temperature Switches Table 2. Hysteresis Selection PART MAX6505 MAX6506 MAX6507 MAX6508 +75°C TEMPERATURE -10°C TYPICAL THRESHOLD HYSTERESIS WARN CONDITIONS ALARM CONDITIONS 2°C — 5°C ∆TWA = 5°C or 10°C — — 10°C -— — — ∆TWA = 20°C or 30°C — 2°C S0 = GND -— — — — 10°C S0 = VCC — +2.5V TO +5.5V HYSTERESIS ≈ 2°C -10°C HYSFERESIS ≈ 2°C VCC * S1 S0 OVER OK, OVER ALARM MAX6506 WARN SYSTEM SHUTDOWN FAN CONTROL GND OK *∆TAW = TALARM - TWARN IS SET TO +30°C. Figure 2. Temperature Response—MAX6507A04B Outputs with 2°C Hysteresis Figure 3. Low-Power, High-Reliability, Fail-Safe Temperature Monitor power is dissipated within the IC. This corresponds to a +0.288°C shift in the die temperature in the SOT23-6. The high-level integration, low cost, and small size of the MAX6505–MAX6508 facilitate the use of multiple temperature monitors to increase system reliability. Power Supply and Bypassing The MAX6505 and MAX6508 operate from a singlesupply voltage in the +2.5V to +5.5V range. Connect a 0.1µF capacitor on the supply voltage line close to the VCC pin for bypassing. Low-Cost, Fail-Safe Temperature Monitor The MAX6505/MAX6506 provide two outputs that can be used for fail-safe temperature applications (Figure 3). For example, the first output can activate a fan when the die temperature exceeds a certain preset temperature. The second output asserts at a higher temperature that could be caused by a wide variety of destructive fault conditions, including latchup, short circuit, and cooling system failure. This output can be used to initiate such actions as shutdown of the entire system (see Typical Operating Circuits). 6 _______________________________________________________________________________________ Dual Trip SOT Temperature Switches PART SUFFIX TRIP POINT (°C) TOP MARK AAKK MAX6506 UTN035 -35 AALR -30 AAKL MAX6506 UTN030 -30 AALS -25 AAKM MAX6506 UTN025 -25 AALT UTN020 -20 AAKN MAX6506 UTN020 -20 AALU MAX6505 UTN015 -15 AAKO MAX6506 UTN015 -15 AALV MAX6505 UTN010 -10 AAKP MAX6506 UTN010 -10 AALW MAX6505 UTN005 -5 AAKQ MAX6506 UTN005 -5 AALX MAX6505 UTP000 0 AAKR MAX6506 UTP000 0 AALY MAX6505 UTP005 5 AAKS MAX6506 UTP005 5 AALZ MAX6505 UTP010 10 AAKT MAX6506 UTP010 10 AAMA MAX6505 UTP015 15 AAKU MAX6506 UTP015 15 AAMB MAX6505 UTP020 20 AAKV MAX6506 UTP020 20 AAMC MAX6505 UTP025 25 AAKW MAX6506 UTP025 25 AAMD MAX6505 UTP030 30 AAKX MAX6506 UTP030 30 AAME MAX6505 UTP035 35 AAKY MAX6506 UTP035 35 AAMF MAX6505 UTP040 40 AAKZ MAX6506 UTP040 40 AAMG MAX6505 UTP045 45 AALA MAX6506 UTP045 45 AAMH MAX6505 UTP050 50 AALB MAX6506 UTP050 50 AAMI MAX6505 UTP055 55 AALC MAX6506 UTP055 55 AAMJ MAX6505 UTP060 60 AALD MAX6506 UTP060 60 AAMK MAX6505 UTP065 65 AALE MAX6506 UTP065 65 AAML MAX6505 UTP070 70 AALF MAX6506 UTP070 70 AAMM MAX6505 UTP075 75 AALG MAX6506 UTP075 75 AAMN MAX6505 UTP080 80 AALH MAX6506 UTP080 80 AAMO MAX6505 UTP085 85 AALI MAX6506 UTP085 85 AAMP MAX6505 UTP090 90 AALJ MAX6506 UTP090 90 AAMQ PART SUFFIX TRIP POINT (°C) TOP MARK MAX6505 UTN035 -35 MAX6505 UTN030 MAX6505 UTN025 MAX6505 MAX6505 UTP095 95 AALK MAX6506 UTP095 95 AAMR MAX6505 UTP100 100 AALL MAX6506 UTP100 100 AAMS MAX6505 UTP105 105 AALM MAX6506 UTP105 105 AAMT MAX6505 UTP110 110 AALN MAX6506 UTP110 110 AAMU MAX6505 UTP115 115 AALO MAX6506 UTP115 115 AAMV MAX6505 UTP120 120 AALP MAX6506 UTP120 120 AAMW MAX6505 UTP125 125 AALQ MAX6506 UTP125 125 AAMX _______________________________________________________________________________________ 7 MAX6505–MAX6508 Table 3. MAX6505/MAX6506 Suffix and Top Mark Codes MAX6505–MAX6508 Dual Trip SOT Temperature Switches Table 4. MAX6507/MAX6508 Trip Temperature Code TRIP TEMPERATURE (°C) -40 -35 -30 -25 -20 -15 -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 HEX CODE* 82 87 8C 91 96 9B A0 A5 00 05 0A 0F 14 19 1E 23 28 2D 32 37 3C 41 46 4B 50 55 5A 5F 64 69 6E 73 78 125 7D Temperature-Window Alarm The MAX6507 and MAX6508 have an output (OK, OK) that indicates the die temperature is within the selected temperature window. This output is asserted when within the window, and deasserted when outside the window. Additionally, a second digital output indicates when the die temperature is above the upper set point. This is useful in systems where operation is optimized over a predetermined temperature range. The thermal overrange signal can be used to assert a thermal shutdown, power-up, recalibration, or other temperaturedependent function (Figure 4 and Typical Operating Circuits). +2.5V TO +5.5V VCC S0 OK MAX6508 OVER SHUTDOWN GND Figure 4. Temperature-Window Alarms Chip Information TRANSISTOR COUNT: 796 PROCESS: BiCMOS *Two hex codes are used in the suffix. The first indicates the the low trip temperature and the second indicates the high trip temperature. For example, the MAX6507UT8255-T has a lower trip point of -40 °C and an upper trip point of +85 °C. 8 OUT OF RANGE _______________________________________________________________________________________ Dual Trip SOT Temperature Switches VCC +2.5V TO +5.5V FAN +2.5V TO +5.5V R1 VCC S0 WARN MAX6505 S1 R2 VCC VCC S0 INT µP S1 SHDN ALARM GND GND WARN MAX6506 ALARM GND VCC INT VCC µP GND FAN +2.5V TO +5.5V VCC OVER VCC S0 MAX6508 INT OK GND µP GND Selector Guide TEMPERATURE THRESHOLD RANGE PART OUTPUT LOGIC OUTPUT STAGE MAX6505 ALARM, WARN Open Drain -40°C to +125°C MAX6506 ALARM, WARN Push-Pull -40°C to +125°C MAX6507 OVER, OK Open Drain -40°C to +125°C MAX6508 OVER, OK Push-Pull -40°C to +125°C _______________________________________________________________________________________ 9 MAX6505–MAX6508 Typical Operating Circuits Dual Trip SOT Temperature Switches 6LSOT.EPS MAX6505–MAX6508 Package Information 10 ______________________________________________________________________________________ Dual Trip SOT Temperature Switches MAX6505–MAX6508 NOTES ______________________________________________________________________________________ 11 MAX6505–MAX6508 Dual Trip SOT Temperature Switches NOTES 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. 12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.