19-1617; Rev 1b; 9/00
Resistor-Programmable
SOT Temperature Switches
________________General Description
The MAX6509/MAX6510 are fully integrated, resistor-
programmable temperature switches with thresholds
set by an external resistor. They require only one exter-
nal resistor to set the temperature threshold within a
wide -40°C to +125°C temperature range. The MAX6509
provides an open-drain output. The MAX6510 features
three selectable output options: active-low, active-high,
and open drain with an internal pull-up resistor.
These switches operate with a +2.7V to +5.5V single
supply while providing a temperature threshold accura-
cy of ±0.5°C (typ) or ±4.7°C (max). They typically con-
sume 32µA supply current. Hysteresis is pin selectable
to 2°C or 10°C.
The MAX6509/MAX6510 are available in 5-pin and 6-pin
SOT23 packages, respectively.
____________________________Features
♦
±0.5°C Threshold Accuracy
♦
±4.7°C (max) Threshold Accuracy (-40°C to +125°C)
♦
Temperature Threshold Set by a 1% External
Resistor
♦
Set-Hot or Set-Cold Option
♦
Low 32µA Supply Current
♦
Open-Drain, Push-Pull Outputs;
Open-Drain with Internal Pull-Up Resistor
♦
Pin-Selectable 2°C or 10°C Hysteresis
♦
SOT23 Packages
MAX6509/MAX6510
________________________Applications
µP Temperature Monitoring in High-Speed
Computers
Temperature Control
Temperature Alarms
Fan Control
Automotive
PART*
†MAX6509CAUK-T
MAX6509HAUK-T
MAX6510CAUT-T**
†MAX6510HAUT-T**
Ordering Information
TEMP. RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
TOP
MARK
ADNT
ADNU
AAHA
AAHB
*A
minimum order of 2500 pc. is required for SOT packages.
**See
Table 1 for selectable output options.
†Contact
factory for availability.
Typical Operating Circuit
+2.7V TO +5.5V
0.1µF
V
CC
SET
R
SET
V
CC
INT
µP
GND
2
GND
GND
OUT
3
4
HYST
SET
1
5
V
CC
Pin Configurations
TOP VIEW
SET
1
6
V
CC
MAX6509
OUT
MAX6510
(OUT)
(OUTSET)
GND HYST
MAX6509
GND
2
MAX6510
5
OUTSET
OUT, OUT
3
4
HYST
SOT23-5
( ) ARE FOR MAX6510.
SOT23-6
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Resistor-Programmable
SOT Temperature Switches
MAX6509/MAX6510
ABSOLUTE MAXIMUM RATINGS
Reference to GND Supply Voltage (V
CC
).................-0.3V to +6V
OUT
(MAX6509) ....................................................-0.3V to +6V
OUT,
OUT (MAX6510).............................-0.3V to (V
CC
+ 0.3V)
SET, HYST, OUTSET ..................................-0.3V to (V
CC
+ 0.3V)
Output Current (all pins) .....................................................20mA
Input Current (all pins) ........................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C).............571mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +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
(V
CC
= +2.7V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage Range
Supply Current
Temperature Threshold
Accuracy
Temperature Threshold
Hysteresis
HYST Input Leakage
HYST Input Threshold
OUT Impedance to V
CC
Output Voltage High
Output Voltage Low
Open-Drain Output Leakage
Current
OUTSET Voltage
V
OH
V
OL
I
OUT
V
IH
V
IL
OUTSET = unconnected (MAX6510)
I
OUT
= 5mA, OUTSET = GND or V
CC
I
OUT
= 5mA
V
OUT
= V
CC
(MAX6509)
OUT, active low
V
OUTSET
MAX6510
OUT, active high
OUT, open drain
V
OUTSET
= GND
OUTSET Current
I
OUTSET
MAX6510
V
OUTSET
= V
CC
OUTSET = unconnected
Note 1:
100% production tested at T
A
= +25°C. Specifications over temperature limits are guaranteed by design.
0.85
·
V
CC
0.72
·
V
CC
-5.5
5.5
±0.1
µA
0.55
·
V
CC
60
100
V
CC
- 0.4
0.3
10
0.2
·
V
CC
V
SYMBOL
V
CC
MAX6509
I
CC
OUTSET = GND or V
CC
(MAX6510)
OUTSET = unconnected,
OUT
= low
∆T
TH
T
HYST
T
A
= 0°C to +125°C
T
A
= -40°C to 0°C
HYST = GND
HYST = V
CC
CONDITIONS
MIN
2.7
32
47
97
±0.5
±0.5
2
10
1
V
CC
- 0.4
0.4
160
TYP
MAX
5.5
50
80
165
±4.7
±3.7
µA
µA
°C
°C
µA
V
kΩ
V
V
µA
UNITS
V
2
_______________________________________________________________________________________
Resistor-Programmable
SOT Temperature Switches
__________________________________________Typical Operating Characteristics
(V
CC
= +5V, R
PULL-UP
= 10kΩ (MAX6509 only), T
A
= +25°C, unless otherwise noted.)
R
SET
vs. TEMPERATURE
(T
A
= -40°C TO 0°C)
MAX6509/10 toc01
MAX6509/MAX6510
SUPPLY CURRENT vs. TEMPERATURE
50
45
SUPPLY CURRENT (µA)
40
35
30
V
CC
= +2.7V
25
20
15
10
R
SET
= 0
OUTSET = GND (MAX6510)
-50
-25
0
25
50
75
100
125
TEMPERATURE (°C)
V
CC
= +3.3V
R
SET
(kΩ)
V
CC
= +5V
160
150
140
130
120
110
100
90
-40
-35
-30
-25
-20
-15
-10
-5
0
TEMPERATURE (°C)
R
SET
vs. TEMPERATURE
(T
A
= 0°C TO +125°C)
MAX6509/10 toc03
TRIP THRESHOLD OFFSET vs.
TEMPERATURE
0.15
SET POINT OFFSET (°C)
90
80
70
R
SET
(kΩ)
60
50
40
30
20
10
0
0
20
40
60
80
100
120
V
CC
= +2.7V
0.10
0.05
0
-0.05
-0.10
-0.15
-0.20
V
CC
= +2.7V
-50
-25
0
25
50
75
100
V
CC
= +3.3V
V
CC
= +3.3V
V
CC
= +5V
140
125
TEMPERATURE (°C)
TEMPERATURE (°C)
TRIP POINT ERROR vs.
SET TEMPERATURE
0.9
0.8
0.7
ERROR
(°C)
0.6
0.5
0.4
0.3
0.2
0.1
0
-40 -25
0
25
50
75
100
125
TEMPERATURE (°C)
50ppm
0
-40
R
SET
200ppm
100ppm
V
CC
= +5V
1% R
SET
SET RESISTOR TEMPCO
MAX6509/10 toc05
HYSTERESIS vs. TEMPERATURE
MAX6509/10 toc06
1.0
12
10
HYSTERESIS (°C)
8
6
4
HYST = GND
2
HYST = V
CC
-25
0
25
50
75
100
125
TEMPERATURE (°C)
_______________________________________________________________________________________
MAX6509/10 toc04
100
0.20
MAX6509/10 toc02
3
Resistor-Programmable
SOT Temperature Switches
MAX6509/MAX6510
Pin Description
PIN
NAME
MAX6509
1
2
3
—
4
5
MAX6510
1
2
—
3
4
6
SET
GND
OUT
OUT,
OUT
HYST
V
CC
OUTSET
Temperature Set Point. Connect an external 1% resistor from SET to GND to set trip point.
Ground
Open-Drain Output. Reset to high impedance during power-on.
Open-Drain with Internal Pull-Up Resistor, Active-High, or Active-Low Output.
See Table 1. Reset to deassert during power-on.
Hysteresis Selection. Hysteresis is 10°C for HYST = V
CC
, 2°C for HYST = GND.
Power-Supply Input
Trilevel Control Input:
OUTSET = V
CC
sets OUT to active high.
OUTSET = GND sets OUT to active low.
OUTSET = Unconnected sets OUT to open drain with internal pull-up resistor.
FUNCTION
—
5
Detailed Description
The MAX6509/MAX6510 fully integrated temperature
switches incorporate two temperature-dependent refer-
ences and one comparator. One reference exhibits a
positive temperature coefficient, and the other has a
negative temperature coefficient. 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
temperature is close to the threshold. The MAX6509
has an active-low, open-drain output structure that can
only sink current. The MAX6510 has three different out-
put options from which to choose (Table 1).
The MAX6509/MAX6510 are programmable for a wide
range of temperature thresholds from -40°C to +125°C.
The temperature threshold is set by an external resistor
between SET and GND. The MAX6509 output easily
interfaces with a microprocessor (µP) reset input
(Figure 2). The MAX6510 output is intended for applica-
tions such as driving a fan control switch (Figure 3).
Hysteresis Input
The HYST pin is a CMOS-compatible input that selects
hysteresis at either a high level (10°C for HYST = V
CC
)
or a low level (2°C for HYST = GND). Hysteresis pre-
vents the output from oscillating when the temperature
is near the trip point.
Do not leave HYST unconnected.
Connect HYST to GND or V
CC
. Other input voltages
cause increased supply current.
Choose the set-hot temperature (H) or set-cold temper-
ature (C) option to ensure that the trip point is accurate
and the hysteresis is in the right direction. A MAX6509
or MAX6510 with the H suffix will first trip at the correct
point when temperature is increasing. For example, a
MAX6509HAUK-T or MAX6510HAUT-T with its trip point
set to 100°C will assert when its temperature rises
above +100°C, and will not deassert until its tempera-
ture drops below +100°C minus the selected hysteresis
value (e.g., +98°C if 2°C hysteresis is chosen). Con-
versely, if the trip temperature of a MAX6509CAUK-T or
MAX6510CAUT-T is -40°C, the output asserts at
-40°C as temperature falls, and deasserts when tem-
perature rises above -40°C plus the hysteresis value
(e.g., -38°C if 2°C hysteresis is chosen) as shown in
Figure 4.
Table 1. OUTSET-Selectable Outputs
OUTSET
Connected to V
CC
Connected to GND
Unconnected
OUT
Active high
Active low
Open drain with internal
pull-up resistor
Output Selection
The MAX6509 provides an open-drain output. The
MAX6510 features three output options selectable by
OUTSET (Table 1).
4
_______________________________________________________________________________________
Resistor-Programmable
SOT Temperature Switches
MAX6509/MAX6510
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
HYST
NETWORK
V
OUT
MAX6509
WITH A PULL-UP RESISTOR
HYST
T
TH
HYSTERESIS*
TEMP
MAX6509HAUK-T
V
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
OUTSET = V
CC
HYST
NETWORK
OUT
MAX6510
HYST
T
TH
HYSTERESIS*
TEMP
MAX6510HAUT-T
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
HYST
NETWORK
V
OUT
MAX6509
WITH A PULL-UP RESISTOR
HYST
T
TH
HYSTERESIS*
TEMP
MAX6509CAUK-T
MAX6510
OUT
NEGATIVE
TEMPCO
REFERENCE
POSITIVE
TEMPCO
REFERENCE
OUTSET = V
CC
HYST
NETWORK
OUT
HYST
T
TH
HYSTERESIS*
TEMP
MAX6510CAUT-T
*HYSTERESIS IS 10°C FOR HYST = V
CC
AND 2°C FOR HYST = GND.
Figure 1. Block and Functional Diagrams
_______________________________________________________________________________________
5
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