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MAX6505UTP065-MAX6505UTP085+-MAX6505UTP085+T
Dual Trip SOT Temperature Switches
General DescriptionThe MAX6505–MAX6508 temperature switches have dual
logic outputs that assert when the die temperature cross-
es their trip thresholds. Trip thresholds are factory pro-
grammed to convenient temperatures in 5°C increments.
The MAX6505/MAX6506 have an ALARM output that
asserts when the temperature is above the factory-pro-
grammed 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 thresh-
old. 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 6-
pin SOT23 package.
________________________ApplicationsµP Temperature Monitoring in High-Speed
Computers
Temperature Control
Temperature Alarms
Fan Control
Features±0.5°C (typ) Threshold Accuracy Over Full
Temperature RangeNo External Components RequiredLow Cost30µA (typ) Supply CurrentFactory-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 *To complete the suffix information for the MAX6505/
MAX6506, add P or N for positive or negative trip tempera-
ture, 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).
**To complete the suffix information for MAX6507/MAX6508,
see Table 4.
MAX6505–MAX6508
Dual Trip SOT Temperature Switches
Pin Configurations19-1712; Rev 1; 4/00
Ordering Information
Selector Guide appears at end of data sheet.
Typical Operating Circuits appear at end of data sheet.
MAX6505–MAX6508
Dual Trip SOT Temperature Switches
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +2.5V to +5.5V, RPULLUP= 100kΩ(MAX6505/MAX6507 only), TA= -40°C to +125°C, unless otherwise noted. Typical values
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.
Supply Voltage (VCCto 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
(TMINto 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
MAX6505–MAX6508
Dual Trip SOT Temperature SwitchesSUPPLY CURRENT
vs. TEMPERATURE
MAX6505/8-01
TEMPERATURE (°C)
SUPPLY CURRENT (µA)
HYSTERESIS vs. TRIP TEMPERATURE
MAX6505/8-02
TEMPERATURE (°C)
HYSTERESIS (
TRIP-POINT ERROR (%)
vs. SUPPLY VOLTAGE
MAX6505/8-03
SUPPLY VOLTAGE (V)
TRIP-POINT ERROR (%)
MAX6505
STARTUP AND POWER-DOWN
(T < TTH)MAX6505/8-04
A: VCC PULSE
B: ALARM VOLTAGE, RPULLUP = 100kΩ
100µs/div
2V/div
MAX6505
STARTUP DELAY
(T > TTH)MAX6505/8-05
A: VCC PULSE
B: ALARM VOLTAGE, RPULLUP = 100kΩ
100µs/div
2V/div
Typical Operating Characteristics(VCC = +5V, unless otherwise noted.)
ELECTRICAL CHARACTERISTICS (continued)(VCC= +2.5V to +5.5V, RPULLUP= 100kΩ(MAX6505/MAX6507 only), TA= -40°C to +125°C, unless otherwise noted. Typical values
Note 2:TALARM, TUNDER, and TOVERare factory-programmed temperature trip thresholds from -40°C to +125°C in 5°Cincrements.
Note 3:Temperature threshold hysteresis is defined as the difference from positive-going temperature thresholds minus the nega-
tive-going temperature thresholds.
MAX6505–MAX6508
Dual Trip SOT Temperature Switches
Pin Description
MAX6505–MAX6508
Dual Trip SOT Temperature Switches
_______________Detailed DescriptionThe MAX6505–MAX6508 fully integrated temperature
switches incorporate two temperature-dependent refer-
ences and a comparator. One reference exhibits a pos-
itive temperature coefficient and the other a negative
temperature coefficient. The temperature at which the
two reference voltages are equal determines the tem-
perature 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 differ-
ence between the two trip points (∆TAW) is pin selec-
table 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.
The MAX6507/MAX6508 have two factory-programmed
threshold temperatures (TOVERand TUNDER) and two
outputs (OK and OVER). One output (OK) asserts
when the temperature is between TOVERand TUNDER.
The other output (OVER) asserts when the temperature
is above TOVER. Table 4 shows the hex codes to deter-
mine the part numbers associated with specific values
of TOVERand 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 TUN-
DER= -10°C and TOVER= +75°C will have the part
number MAX6508UTA04B (Table 4 and Figure 2).
MAX6507 has open-drain outputs; MAX6508 has push-
pull outputs.
Hysteresis SelectionThe 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
∆TAWis 5°C or 10°C (set by S0 and S1), WARN hys-
teresis is 5°C. If ∆TAWis 20°C or 30°C, WARN hystere-
sis is 10°C. MAX6507 and MAX6508 have pin-selectable
hysteresis of 2°C or 10°C for both OVER and OK out-
puts (Table 2).
Applications Information
Thermal ConsiderationsThe 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 monitor-
ing is good thermal contact between the MAX6505–
MAX6508 package and the device being monitored. In
some applications, the SOT23-6 packages may be
small enough to fit underneath a socketed micro-
processor (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 ther-
mal 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 PDISSIPATIONis the power dissipated by the
MAX6505–MAX6508, and θJAis the package’s thermal
resistance. The typical thermal resistance is +115°C/W
for the SOT23-6 package. To limit the effects of self-heat-
ing, 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
Table 1. MAX6505/MAX6506 ∆TAW
MAX6505–MAX6508
Dual Trip SOT Temperature Switchespower is dissipated within the IC. This corresponds to a
+0.288°C shift in the die temperature in the SOT23-6.
Power Supply and BypassingThe MAX6505 and MAX6508 operate from a single-
supply voltage in the +2.5V to +5.5V range. Connect a
0.1µF capacitor on the supply voltage line close to the
VCCpin for bypassing.
Low-Cost, Fail-Safe Temperature MonitorThe 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 condi-
tions, 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).
The high-level integration, low cost, and small size of the
MAX6505–MAX6508 facilitate the use of multiple temper-
ature monitors to increase system reliability.
