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19-1712; Rev 1; 4/00
Dual Trip SOT Temperature Switches
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 5C increments. The MAX6505/MAX6506 have an ALARM output that asserts when the temperature is above the factory-programmed thresholds (available from -40C to +125C). 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 +5C, +10C, +20C, or +30C. 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 -40C to +125C. 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 0.5C (typ), 5.5C (max). Operating from a +2.5V to +5.5V supply, these low-cost devices typically consume 30A supply current and require no external components for setting trip points. The MAX6505-MAX6508 are available in a 6pin SOT23 package.
Features
o 0.5C (typ) Threshold Accuracy Over Full Temperature Range o No External Components Required o Low Cost o 30A (typ) Supply Current o Factory-Programmed Thresholds from -40C to +125C in 5C Increments o Open-Drain Outputs (MAX6505/MAX6507), Push-Pull Outputs (MAX6506/MAX6508) o Pin Selectable +2C, +10C Hysteresis (MAX6507/MAX6508) o Pin Selectable +5C, +10C, +20C, +30C TALARM - TWARN (MAX6505/MAX6506) o SOT23-6 Package
MAX6505-MAX6508
Ordering Information
PART MAX6505UT_ _ _ _-T* MAX6506UT_ _ _ _-T* MAX6507UT_ _ _ _-T** MAX6508UT_ _ _ _-T** TEMP. RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C PINPACKAGE 6 SOT23-6 6 SOT23-6 6 SOT23-6 6 SOT23-6
________________________Applications
P Temperature Monitoring in High-Speed Computers Temperature Control Temperature Alarms Fan Control
*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 +55C threshold (Table 3). Contact the factory for pricing and availability of temperature versions (minimum order 10,000 pieces). **To complete the suffix information for MAX6507/MAX6508, see Table 4. Selector Guide appears at end of data sheet. Typical Operating Circuits appear at end of data sheet.
Pin Configurations
TOP VIEW
WARN (WARN) 1 6 ALARM (ALARM) OK (OK) 1 6 OVER (OVER)
GND 2
MAX6505 MAX6506
5
S0
GND 2
MAX6507 MAX6508
5
N.C.
S1 3 ( ) ARE FOR MAX6506.
4
VCC
S0 3
4
VCC ( ) ARE FOR MAX6508.
SOT23-6
SOT23-6
________________________________________________________________ Maxim Integrated Products
1
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
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 = +70C) 6-Pin SOT23 (derate 7.1mW/C above +70C)...........571mW Operating Temperature Range (TMIN to TMAX) ..............................................-40C to +125C Thermal Resistance (JA)..............................................115C/W Storage Temperature Range .............................-65C to +150C Maximum Die Temperature..............................................+150C Lead Temperature (soldering, 10s) .................................+300C
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 = 100k (MAX6505/MAX6507 only), TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C and VCC = +5V, unless otherwise noted.) (Note 1)
PARAMETER Supply Voltage Range SYMBOL VCC S0 = S1 = GND Supply Current ICC S0 = GND Temperature Threshold Accuracy (Note 2) -40C to 0 C TTH 0C to +95 C +95C to +125 C S1 = GND, S0 = GND Delta Temperature (TALARM -TWARNING) MAX6505/MAX6506 TAW S1 = GND, S0 = VCC S1 = VCC, S0 = GND S1 = VCC, S0 = VCC ALARM (MAX6505/MAX6506) WARN (MAX6505/MAX6506) THYST OK, OVER (MAX6507/MAX6508) VIH VIL Output Voltage High (MAX6506/MAX6508) ISOURCE = 500A, VCC > 2.5V VOH ISOURCE = 800A,VCC > 4.5V Output Voltage Low VOL ISINK = 3.2mA, VCC > 2.5V ISINK = 5mA, VCC > 4.5V 0.8 x VCC VCC -1.5 0.5 0.5 V TAW = 5C or 10C TAW = 20C or 30C S0 = GND S0 = VCC Logic Input Levels (S1, S0) 0.8 x VCC 0.8 MAX6505/ MAX6506 MAX6507/ MAX6508 -5.5 -3.5 -4 CONDITIONS MIN 2.5 40 30 0.5 0.5 0.5 5 10 20 30 2 5 10 2 10 V C C TYP MAX 5.5 80 A 60 5.5 3.5 4 C UNITS V
Temperature Threshold Hysteresis (Note 3)
V
2
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Dual Trip SOT Temperature Switches
ELECTRICAL CHARACTERISTICS (continued)
(VCC = +2.5V to +5.5V, RPULLUP = 100k (MAX6505/MAX6507 only), TA = -40C to +125C, unless otherwise noted. Typical values are at TA = +25C and VCC = +5V, unless otherwise noted.) (Note 1)
PARAMETER Open-Drain Output Leakage Current SYMBOL CONDITIONS VCC = 5.5V, VALARM = 5.5V, VWARN = 5.5V (MAX6505) VCC = 5.5V, VOK = 5.5V, VOVER = 5.5V (MAX6507) MIN TYP MAX 1 A 1 UNITS
MAX6505-MAX6508
Note 1: Note 2: Note 3:
100% production tested at TA = +25C. Specifications over temperature limits are guaranteed by design. TALARM, TUNDER, and TOVER are factory-programmed temperature trip thresholds from -40C to +125C in 5C 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
VCC = +5V RPULLUP = 100k
MAX6505/8-01
HYSTERESIS vs. TRIP TEMPERATURE
VCC = +5V RPULLUP = 100k
MAX6505/8-02
TRIP-POINT ERROR (%) vs. SUPPLY VOLTAGE
0 TRIP-POINT ERROR (%) -0.1 -0.2 -0.3 -0.4 -0.5 -0.6 -0.7 NORMALIZED TO TRIP-POINT TEMPERATURE AT VCC = +5V 2.5 3.0 3.5 4.0 4.5 5.0 5.5
MAX6505/8-03
50 45 SUPPLY CURRENT (A) 40 35 30 25 20
2.5
0.1
2.0 HYSTERESIS (C)
1.5
1.0
0.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C) -40 -25 -10 5 20 35 50 65 80 95 110 125 TEMPERATURE (C)
-0.8
SUPPLY VOLTAGE (V)
MAX6505 STARTUP AND POWER-DOWN (T < TTH)
MAX6505/8-04
MAX6505 STARTUP DELAY (T > TTH)
MAX6505/8-05
A 2V/div
A 2V/div
B
B
100s/div A: VCC PULSE B: ALARM VOLTAGE, RPULLUP = 100k
100s/div A: VCC PULSE B: ALARM VOLTAGE, RPULLUP = 100k
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
Pin Description
PIN MAX6505 MAX6506 MAX6507 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. 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 10C hysteresis. Connect to GND for 2C hysteresis. Supply Voltage Input. Bypass VCC to GND with a 0.1F ceramic capacitor. No Connection. Not internally connected. 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. 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. 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. Open-Drain Active-Low Alarm Output. ALARM goes low when the die temperature exceeds the factory-set value of TALARM. Push-Pull Active-High Alarm Output. ALARM goes high when the die temperature exceeds the factory-set value of TALARM. NAME FUNCTION
1
---
---
--- 2 3, 5
1 2 3, 5
--- 2 ---
--- 2 ---
WARN GND S1, S0
--- 4 --- ---
--- 4 --- ---
3 4 5 6
3 4 5 ---
S0 VCC N.C. OVER
---
---
_
6
OVER
---
---
1
---
OK
---
---
---
1
OK
6
---
---
---
ALARM
---
6
---
---
ALARM
4
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Dual Trip SOT Temperature Switches
_______________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 +5C, +10C, +20C, or +30C 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. 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 = -10C and TOVER = +75C will have the part number MAX6508UTA04B (Table 4 and Figure 2). MAX6507 has open-drain outputs; MAX6508 has pushpull outputs.
Table 1. MAX6505/MAX6506 TAW Selection Table
CONTROL PINS S0 GND GND VCC VCC S1 GND VCC GND VCC DESCRIPTION TAW =TALARM - TWARN (C) 5 10 20 30
MAX6505-MAX6508
HYSTERESIS 2C 65C
55C HYSTERESIS 5C
WARN
ALARM
Figure 1. Temperature Response--MAX6505UTP065 Outputs, TAW = 10C, and WARN Hysteresis 5C
Hysteresis Selection
The temperature threshold hysteresis for the ALARM output of the MAX6505/MAX6506 is 2C. The hysteresis for the WARN output depends on the value of TAW. If TAW is 5C or 10C (set by S0 and S1), WARN hysteresis is 5C. If TAW is 20C or 30C, WARN hysteresis is 10C. MAX6507 and MAX6508 have pin-selectable hysteresis of 2C or 10C for both OVER and OK outputs (Table 2).
some applications, the SOT23-6 packages may be small enough to fit underneath a socketed microprocessor (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 MAX6505-MAX6508 die. The rise in die temperature due to self-heating is given by the following formula: TJ = PDISSIPATION JA where P DISSIPATION is the power dissipated by the MAX6505-MAX6508, and JA is the package's thermal resistance. The typical thermal resistance is +115C/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
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Applications Information
Thermal Considerations
The MAX6505-MAX6508 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 MAX6505- MAX6508 package and the device being monitored. In
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
Table 2. Hysteresis Selection
PART MAX6505 MAX6506 MAX6507 MAX6508 ALARM 2C -- --- --- CONDITIONS -- -- -- -- TYPICAL THRESHOLD HYSTERESIS WARN CONDITIONS 5C 10C -- -- TWA = 5C or 10C TWA = 20C or 30C -- -- 2C 10C OK, OVER -- S0 = GND S0 = VCC
+75C TEMPERATURE -10C
HYSTERESIS 2C -10C HYSFERESIS 2C
+2.5V TO +5.5V
VCC
*
OVER
S1 S0
ALARM
SYSTEM SHUTDOWN FAN CONTROL
MAX6506
WARN
GND
OK *TAW = TALARM - TWARN IS SET TO +30C.
Figure 2. Temperature Response--MAX6507A04B Outputs with 2C Hysteresis
Figure 3. Low-Power, High-Reliability, Fail-Safe Temperature Monitor
power is dissipated within the IC. This corresponds to a +0.288C shift in the die temperature in the SOT23-6.
Power Supply and Bypassing
The MAX6505 and MAX6508 operate from a singlesupply voltage in the +2.5V to +5.5V range. Connect a 0.1F capacitor on the supply voltage line close to the VCC pin for bypassing.
The high-level integration, low cost, and small size of the MAX6505-MAX6508 facilitate the use of multiple temperature monitors to increase system reliability.
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).
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
Table 3. MAX6505/MAX6506 Suffix and Top Mark Codes
PART MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 MAX6505 SUFFIX UTN035 UTN030 UTN025 UTN020 UTN015 UTN010 UTN005 UTP000 UTP005 UTP010 UTP015 UTP020 UTP025 UTP030 UTP035 UTP040 UTP045 UTP050 UTP055 UTP060 UTP065 UTP070 UTP075 UTP080 UTP085 UTP090 UTP095 UTP100 UTP105 UTP110 UTP115 UTP120 UTP125 TRIP POINT (C) -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 95 100 105 110 115 120 125 TOP MARK AAKK AAKL AAKM AAKN AAKO AAKP AAKQ AAKR AAKS AAKT AAKU AAKV AAKW AAKX AAKY AAKZ AALA AALB AALC AALD AALE AALF AALG AALH AALI AALJ AALK AALL AALM AALN AALO AALP AALQ PART MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 MAX6506 SUFFIX UTN035 UTN030 UTN025 UTN020 UTN015 UTN010 UTN005 UTP000 UTP005 UTP010 UTP015 UTP020 UTP025 UTP030 UTP035 UTP040 UTP045 UTP050 UTP055 UTP060 UTP065 UTP070 UTP075 UTP080 UTP085 UTP090 UTP095 UTP100 UTP105 UTP110 UTP115 UTP120 UTP125 TRIP POINT (C) -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 95 100 105 110 115 120 125 TOP MARK AALR AALS AALT AALU AALV AALW AALX AALY AALZ AAMA AAMB AAMC AAMD AAME AAMF AAMG AAMH AAMI AAMJ AAMK AAML AAMM AAMN AAMO AAMP AAMQ AAMR AAMS AAMT AAMU AAMV AAMW AAMX
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
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 95 100 105 110 115 120 125 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 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 OUT OF RANGE SHUTDOWN
MAX6508
OVER
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.
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Dual Trip SOT Temperature Switches
Typical Operating Circuits
+2.5V TO +5.5V VCC
MAX6505-MAX6508
FAN +2.5V TO +5.5V VCC S0 S1
MAX6505
R1 WARN ALARM
R2 INT SHDN
VCC S0 P GND S1
VCC WARN
MAX6506
ALARM VCC INT P GND
GND
GND
VCC
+2.5V TO +5.5V
FAN
VCC OVER VCC S0
MAX6508
OK
INT
GND
P GND
Selector Guide
PART MAX6505 MAX6506 MAX6507 MAX6508 OUTPUT LOGIC ALARM, WARN ALARM, WARN OVER, OK OVER, OK OUTPUT STAGE Open Drain Push-Pull Open Drain Push-Pull TEMPERATURE THRESHOLD RANGE -40C to +125C -40C to +125C -40C to +125C -40C to +125C
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
Package Information
6LSOT.EPS
10
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
NOTES
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Dual Trip SOT Temperature Switches MAX6505-MAX6508
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 (c) 2000 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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