Maxim MAX6501UKP095 Low-cost, 2.7v to 5.5v, micropower temperature switches in sot23 and to-220 Datasheet

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.
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