19-1280; Rev 2; 11/99 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 ____________________________Features ♦ ±0.5°C (typical) Threshold Accuracy Over Full Temperature Range The MAX6501/MAX6503 have an active-low, open-drain output intended to interface with a microprocessor (µP) 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 (+35°C to +115°C), asserting when the temperature is above the threshold. The MAX6503/MAX6504 are offered with cold-temperature thresholds (-45°C to +15°C), 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 5-pin SOT23 and 7-pin TO-220 packages. ♦ SOT23-5 and TO220-7 Packages Typical Operating Circuit VCC MAX6502 TOVER GND GND HYST INT ♦ Low Cost ♦ 30µA Supply Current ♦ Factory-Programmed Thresholds from -45°C to +115°C in 10°C Increments ♦ Open-Drain Output (MAX6501/MAX6503) Push-Pull Output (MAX6502/MAX6504) ♦ Pin-Selectable +2°C or +10°C Hysteresis Ordering Information PART* TEMP. RANGE PIN-PACKAGE MAX6501UK_ _ _ _-T -55°C to +125°C 5 SOT23-5 MAX6501CM_ _ _ _-T -55°C to +125°C 7 TO-220-7 MAX6502UK_ _ _ _-T -55°C to +125°C 5 SOT23-5 MAX6502CM_ _ _ _-T -55°C to +125°C 7 TO-220-7 MAX6503UK_ _ _ _-T -55°C to +125°C 5 SOT23-5 MAX6503CM_ _ _ _-T -55°C to +125°C 7 TO-220-7 MAX6504UK_ _ _ _-T -55°C to +125°C 5 SOT23-5 MAX6504CM_ _ _ _-T -55°C to +125°C 7 TO-220-7 *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 SOT23-5 package with a +65°C threshold. Contact the factory for pricing and availability of nonstandard temperature versions (minimum order 10,000 pieces). +2.7V TO +5.5V VCC ♦ No External Components Required µP GND ________________________Applications µP Temperature Monitoring in High-Speed Computers Temperature Control Selector Guide and Pin Configurations appear at end of data sheet. †Patents Temperature Alarms Fan Control Pending ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX6501–MAX6504 † ________________General Description 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 -45°C to +115°C in 10°C increments, and are accurate to ±0.5°C (typ) or ±6°C (max). These devices require no external components and typically consume 30µA supply current. Hysteresis is pin-selectable at +2°C or +10°C. MAX6501–MAX6504 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 ABSOLUTE MAXIMUM RATINGS Supply Voltage (VCC) ...............................................-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 = +70°C) 5-Pin SOT23-5 (derate 7.1mW/°C above +70°C) .........571mW Operating Temperature Range .........................-55°C to +125°C Storage Temperature Range .............................-65°C to +165°C Lead Temperature (soldering, 10sec) .............................+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 = +2.7V to +5.5V, RPULL-UP = 100kΩ (MAX6501/MAX6503 only), TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.) (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 µA -6 ±0.5 6 -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 HYST = GND 2 HYST = VCC 10 VOL 0.2 x VCC 0.8 x VCC ISOURCE = 800µA, 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 = 500µA, VCC > 2.7V (MAX6502/MAX6504 only) UNITS 5.5 -45°C to -25°C VIH VOH MAX 10 V nA Note 1: 100% production tested at TA = +25°C. Specifications over temperature limits are guaranteed by design. Note 2: The MAX6501–MAX6504 are available with internal, factory-programmed temperature trip thresholds from -45°C to +115°C in +10°C increments (see Selector Guide). Note 3: Guaranteed by design. 2 _______________________________________________________________________________________ Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501–MAX6504 __________________________________________Typical Operating Characteristics (VCC = +5V, RPULL-UP = 100kΩ (MAX6501/MAX6503), TA = +25°C, unless otherwise noted.) 35 40 30 20 OUTPUT SOURCE RESISTANCE (Ω) 50 800 MAX6501 TOC01 MAX6501 TOC-A 40 SUPPLY CURRENT (µA) PERCENTAGE OF PARTS SAMPLED (%) SAMPLE SIZE = 300 30 25 20 15 10 10 5 0 -3 -2 -1 0 1 2 3 4 5 VCC = 2.7V 700 600 500 400 VCC = 3.3V 300 VCC = 5.0V 200 100 0 -5 -4 0 -55 -25 5 35 65 95 125 -55 -25 5 35 65 95 125 ACCURACY (°C) TEMPERATURE (°C) TEMPERATURE (°C) OUTPUT SINK RESISTANCE vs. TEMPERATURE SOT23 THERMAL STEP RESPONSE IN PERFLUORINATED FLUID SOT23 THERMAL STEP RESPONSE IN STILL AIR MAX6501 TOC4 MAX6501 TOC03 160 VCC = 2.7V 140 MAX6501 TOC02 TRIP THRESHOLD ACCURACY 60 OUTPUT SINK RESISTANCE (Ω) MAX6502/MAX6504 OUTPUT SOURCE RESISTANCE vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE MAX6501 TOC5 +100°C +100°C 120 100 VCC = 3.3V 80 +12.5°C/div +15°C/div VCC = 5.0V 60 MOUNTED ON 0.75in2 OF 2 oz. COPPER 40 20 MOUNTED ON 0.75in2 OF 2 oz. COPPER +25°C +25°C 0 -55 -25 5 35 65 95 125 5sec/div 20sec/div TEMPERATURE (°C) MAX6501 START-UP AND POWER-DOWN (T < TTH) HYSTERESIS vs. TRIP TEMPERATURE MAX6503 MAX6504 HYST = VCC 14 12 MAX6501 TOC07A MAX6501 TOC8 16 HYSTERESIS (°C) MAX6501 START-UP DELAY (T > TTH) MAX6501 TOC07 MAX6501 MAX6502 HYST = VCC A A 10 8 6 MAX6501 MAX6502 HYST = GND MAX6503 MAX6504 HYST = GND 4 2 B B 0 -45 -25 -5 15 35 55 75 TRIP TEMPERATURE (°C) 95 115 TRACE A: TOVER VOLTAGE, RPULL-UP = 100kΩ TRACE B: VCC PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT TRACE A: TOVER VOLTAGE, RPULL-UP = 100kΩ TRACE B: VCC PULSE DRIVEN FROM 3.3V CMOS LOGIC OUTPUT _______________________________________________________________________________________ 3 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 MAX6501–MAX6504 Pin Description PIN NAME FUNCTION 1, 2 GND Ground. Not internally connected. Tie both ground 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 VCC for +10°C hysteresis. 4 4 VCC MAX6501 MAX6502 MAX6503 MAX6504 1, 2 1, 2 1, 2 3 3 4 4 5 — — — TOVER Open-Drain, Active-Low Output. TOVER goes low when the die temperature exceeds the factory-programmed temperature threshold. Connect to a 100kΩ pull-up 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. — — 5 — TUNDER Open-Drain, Active-Low Output. TUNDER goes low when the die temperature goes below the factory-programmed temperature threshold. Connect to a 100kΩ pull-up 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 +2°C or +10°C hysteresis keeps the output from oscillating when the die temperature approaches the threshold temperature. The MAX6501/MAX6503 have an activelow, open-drain 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 = +25°C state at start-up for 50µs. The MAX6501–MAX6504 are available with factorypreset temperature thresholds from -45°C to +115°C in 10°C increments. Table 1 lists the available temperature threshold ranges. The MAX6501/MAX6503 outputs are intended to interface with a microprocessor (µP) reset input (Figure 2). The MAX6502/MAX6504 outputs are intended for applications such as driving a fan control (Figure 3). 4 Supply Input (+2.7V to +5.5V) Table 1. Factory-Programmed Threshold Range PART THRESHOLD (TTH) RANGE MAX6501 +35°C < TTH < +115°C MAX6502 +35°C < TTH < +115°C MAX6503 -45°C < TTH < +15°C MAX6504 -45°C < TTH < +15°C Hysteresis Input The HYST pin is a CMOS-compatible input that selects hysteresis at either a high level (+10°C for HYST = VCC) or a low level (+2°C for HYST = GND). Hysteresis prevents the output from oscillating when the temperature approaches the trip point. The HYST pin should not float. 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 graphs.) _______________________________________________________________________________________ Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 V TOVER MAX6501–MAX6504 TOVER MAX6501 WITH 100kΩ PULL-UP POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD +25°C TTH HOT TEMP MAX6501 MAX6502 V TOVER TOVER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD +25°C TTH HOT TEMP MAX6502 TUNDER MAX6503 WITH 100kΩ PULL-UP V TUNDER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD TTH +25°C HOT TEMP MAX6503 V TUNDER MAX6504 TUNDER POSITIVE TEMPCO REFERENCE NEGATIVE TEMPCO REFERENCE HYST NETWORK HYST COLD TTH +25°C HOT TEMP MAX6504 Figure 1. Block and Functional Diagrams _______________________________________________________________________________________ 5 MAX6501–MAX6504 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 +3.3V +5V RPULL-UP 100k VCC µP VCC VCC µP MAX6501 INT SHUTDOWN OR RESET TOVER HEAT HYST HEAT HYST MAX6502 FAN GND GND TOVER GND GND Figure 2. Microprocessor Alarm/Reset Applications Information Thermal Considerations The MAX6501–MAX6504 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 MAX6501– MAX6504 package and the device being monitored. In some applications, the SOT23-5 package may be small enough to fit underneath a socketed µP, allowing the device to monitor the µP’s temperature directly. The TO-220 package can monitor the temperature of a heat sink directly, and presents the lower thermal resistance of the two packages. 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 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 θJA where P DISSIPATION is the power dissipated by the MAX6501–MAX6504, and θJA is the package’s thermal resistance. The typical thermal resistance is 140°C/W for the SOT23-5 package and 75°C/W for the TO-220 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 6 VCC Figure 3. Overtemperature Fan Control power is dissipated within the IC. This corresponds to a 0.042°C shift in the die temperature in the SOT23-5. 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 -5°C to +75°C 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 +45°C. The second MAX6502 triggers a system shutdown if the die temperature reaches +75°C. 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 and TO-220 MAX6501–MAX6504 +5V +5V VCC VCC MAX6502_ _P075 GND GND HEAT OVERTEMP HYST MAX6502_ _P075 GND TOVER OUT OF RANGE GND HYST TEMPERATURE FAULT TOVER µP VCC TUNDER UNDERTEMP FAN CONTROL MAX6504_ _N005 HEAT HYST GND VCC TOVER HYST GND MAX6502_ _P045 GND +5V RPULL-UP 100k VCC OUT OF RANGE VCC TOVER Figure 5. Low-Power, High-Reliability, Fail-Safe Temperature Monitor TUNDER MAX6501_ _P075 GND MAX6503_ _N005 GND GND GND HYST GND HYST Figure 4. Temperature-Window Alarms Table 2. Device Marking Codes for SOT23-5 Package DEVICE MAX6501UKP035 MAX6501UKP045 MAX6501UKP055 MAX6501UKP065 MAX6501UKP075 MAX6501UKP085 MAX6501UKP095 MAX6501UKP105 MAX6501UKP115 MAX6502UKP035 MAX6502UKP045 MAX6502UKP055 MAX6502UKP065 MAX6502UKP075 MAX6502UKP085 MAX6502UKP095 CODE MINIMUM ORDER ABZF ABZR ACFW ABZS ACFV ACDP ABZT ACFU ACAG ABZG ABZU ACGC ABZV ACGB ACGA ABZW 10k 2.5k 2.5k 2.5k 2.5k 2.5k 2.5k 10k 2.5k 10k 2.5k 2.5k 2.5k 2.5k 2.5k 2.5k DEVICE CODE MINIMUM ORDER MAX6502UKP105 ACFZ 10k MAX6502UKP115 ACFY 2.5k MAX6503UKN045 ADIZ 10k MAX6503UKN035 MAX6503UKN025 MAX6503UKN015 MAX6503UKN005 MAX6503UKP005 MAX6503UKP015 MAX6504UKN045 ACAQ ACAP ACFX ACAN ABZX ACAM ACAX 10k 10k 2.5k 10k 2.5k 10k 10k MAX6504UKN035 MAX6504UKN025 MAX6504UKN015 MAX6504UKN005 MAX6504UKP005 MAX6504UKP015 ACAW ACAV ACGD ACAT ABZY ADKE 10k 10k 2.5k 10k 2.5k 10k _______________________________________________________________________________________ 7 Selector Guide PART Pin Configurations MAX6501 MAX6502 MAX6503 MAX6504 OUTPUT STAGE OpenDrain TRIP TEMP THRESHOLD Hot STANDARD TEMPERATURE THRESHOLDS (°C) MAX6501–MAX6504 Low-Cost, +2.7V to +5.5V, Micropower Temperature Switches in SOT23 and TO-220 Push-Pull OpenDrain Push-Pull Hot Cold Cold -45 ✓ ✓ -35 ✓ ✓ -25 ✓ ✓ -15 ✓ ✓ -5 ✓ ✓ +5 ✓ ✓ +15 ✓ ✓ +35 ✓ ✓ +45 ✓ ✓ +55 ✓ ✓ +65 ✓ ✓ +75 ✓ ✓ +85 ✓ ✓ +95 ✓ ✓ +105 ✓ ✓ +115 ✓ ✓ TOP VIEW GND 1 GND 2 5 TOVER GND 1 (TOVER) MAX6501 MAX6502 MAX6503 MAX6504 GND 2 4 VCC HYST 3 5 TUNDER (TUNDER) 4 VCC HYST 3 SOT23-5 SOT23-5 TO-220-7 TO-220-7 MAX6501 MAX6502 MAX6503 MAX6504 1 2 3 4 5 6 7 HYST GND GND TOVER VCC (TOVER) ( ) ARE FOR MAX6502. 1 2 3 4 5 6 7 HYST GND GND TUNDER VCC (TUNDER) ( ) ARE FOR MAX6504. Chip Information TRANSISTOR COUNT: 237 SUBSTRATE CONNECTED TO GND 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1999 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.