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MAX6685AU75L+T

P1-P3P4-P6P7-P7
General Description
MAX6685/MAX6686 are dual-output temperature switches
that use an external diode-connected transistor as a sens-
ing element. These devices have two logic outputs (T
HIGH
and T
LOW
). T
HIGH
asserts a logic signal when the remote
temperature crosses the factory-programmed, +120°C, or
+125°C upper trip threshold. T
LOW
is asserted when the
remote temperature exceeds the lower threshold, which is
controlled by pins S1 and S2. The lower thresholds are
available in two ranges in 5°C increments. The two ranges
are +40°C to +80°C and +75°C to +115°C. Hysteresis for
both outputs to be deasserted is typically 5°C.
T
HIGH
is an open-drain, active-low output for both the
MAX6685 and the MAX6686. T
LOW
is a CMOS push-pull,
active-high output for the MAX6685 and is an open-drain,
active-low output for the MAX6686. They are available in
a space-saving 8-pin µMAX package.
Applications
Features
♦ Pin-Programmed Lower Temperature Threshold
from +40°C to +80°C or +75°C to +115°C
(5°C Increments)
♦ Preset Upper Threshold: +120°C or +125°C
♦ Open-Drain, Active-Low Output for Upper
Temperature Alarm
♦ CMOS Push-Pull, Active-High or Open-Drain,
Active-Low Output for Lower Temperature Alarm
♦ 1.5°C Accuracy
♦ 3.0V to 5.5V, 200µA Supply
♦ 8-Pin µMAX Package
MAX6685/MAX6686
Dual-Output Remote-Junction
Temperature Switches
________________________________________________________________ Maxim Integrated Products 1
Ordering Information
MAX6685
C
S
12V
GND
CPU
S1
DXN
S2
3.3V
TO SYSTEM
SHUTDOWN
N
T
LOW
DXP
V
DD
T
HIGH
MAX6686
C
S
GND
CPU
S1
DXN
S2
3.3V
TO SYSTEM
SHUTDOWN
TO CLOCK
THROTTLE
CONTROL
T
LOW
DXP
V
DD
T
HIGH
Typical Operating Circuits
19-2459; Rev 2; 4/03
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.
PART
T
LOW
OUTPUT
T
LOW
TRIP
RANGE (0°C)
T
HIGH
TRIP
THRESHOLD (0°C)
PIN-PACKAGE
MAX6685AU40L Push-pull, active high +40°C to +80°C +120°C 8 µMAX
MAX6685AU40H Push-pull, active high +40°C to +80°C +125°C 8 µMAX
MAX6685AU75L Push-pull, active high +75°C to +115°C +120°C 8 µMAX
MAX6685AU75H Push-pull, active high +75°C to +115°C +125°C 8 µMAX
MAX6686AU40L Open drain, active low +40°C to +80°C +120°C 8 µMAX
MAX6686AU40H Open drain, active low +40°C to +80°C +125°C 8 µMAX
MAX6686AU75L Open drain, active low +75°C to +115°C +120°C 8 µMAX
MAX6686AU75H Open drain, active low +75°C to +115°C +125°C 8 µMAX
Pin Configurations appear at end of data sheet.
CPU Temperature
Protection
Fan Control
Multichip Modules
FPGA Temperature
Protection
MAX6685/MAX6686
Dual-Output Remote-Junction
Temperature Switches
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
DD
= 3.0V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at V
DD
= 3.3V and T
A
= +25°C.) (Note 1)
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.
Voltages Referenced to GND
V
DD,
T
LOW
, T
HIGH
.....................................................-0.3V to +6V
DXN .......................................................................-0.3V to +0.8V
All Other Pins..............................................-0.3V to (V
DD
+ 0.3V)
Input Current .........................................................................5mA
Output Current ....................................................................20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin µMAX (derate 4.1mW/°C above +70°C) .............330mW
Operating Temperature Range .........................-40°C to +125°C
Junction Temperature......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
Power-Supply Range V
DD
3.0 5.5 V
Average Supply Current I
DD
200 500 µA
Supply Current During
Conversion
400 800 µA
Power-On Reset Threshold POR V
DD
falling edge 1.0 1.5 2.0 V
POR Threshold Hysteresis 50 mV
V
DD
= 3.3V, T
A
= +25°C, T
RJ
= 0°C to +125°C
(Note 2)
-1.5 +1.5
Temperature Threshold
Accuracy
∆T
TH
T
A
= 0°C to +100°C, T
RJ
= 0°C to +125°C 2.0
°C
Temperature Threshold
Hysteresis
T
HYST
5.0 °C
Supply Sensitivity of Temperature
Threshold
T
A
= +25°C, T
RJ
= 0°C to +125°C,
V
DD
= 3.0V to 5.5V
0.6 °C/V
Output Voltage High V
OH
I
SOURCE
= 1mA, MAX6685 T
LOW
only
V
DD
-
0.2
V
Output Voltage Low V
OL
I
SINK
= 1mA 0.2 V
Logic-Low Input Voltage V
IL
S1, S2 0.4 V
Logic-High Input Voltage V
IH
S1, S2 1.8 V
Input Current S1, S2 10 µA
Open-Drain Output Leakage
Current
V
OUT
= 5.5V, T
LOW
and T
HIGH
1µA
Conversion Time 0.09 0.11 0.13 s
Sample Period 0.35 0.45 0.55 s
High level 80 100 120
Current Sourcing for External
Diode
Low level 8 10 12
µA
Note 1: All parameters are tested at +25°C. Temperature specifications over a range of -40°C to +125°C are guaranteed by design.
Note 2: T
RJ
is the temperature of the remote-sensing diode junction.
MAX6685/MAX6686
Dual-Output Remote-Junction
Temperature Switches
_______________________________________________________________________________________ 3
AVERAGE SUPPLY CURRENT
vs. AMBIENT TEMPERATURE
MAX6685 toc01
AMBIENT TEMPERATURE (°C)
AVERAGE SUPPLY CURRENT (µA)
1007550250-25
120
140
160
180
200
100
-50 125
AVERAGE SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6685 toc02
SUPPLY VOLTAGE (V)
AVERAGE SUPPLY CURRENT (µA)
5.04.54.03.5
50
100
150
200
250
0
3.0 5.5
TEMPERATURE TRIP THRESHOLD ERROR
vs. C
S
CAPACITANCE
MAX6685 toc03
C
S
CAPACITANCE (nF)
TEMPERATURE TRIP THRESHOLD ERROR (°C)
5040302010
2
4
6
8
10
0
060
MAX6685U40H
S1 = S2 = GND
UPPER TEMPERATURE TRIP THRESHOLD
ERROR vs. AMBIENT TEMPERATURE
MAX6685 toc04
AMBIENT TEMPERATURE (°C)
UPPER TRIP THRESHOLD ERROR (°C)
1007525 500-25
-1.6
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
1.6
2.0
-2.0
-50 125
MAX6685U40H
T
HIGH
TRIP = +125°C
LOWER TEMPERATURE TRIP THRESHOLD
ERROR vs. AMBIENT TEMPERATURE
MAX6685 toc05
AMBIENT TEMPERATURE (°C)
LOWER TRIP THRESHOLD ERROR (°C)
1007525 500-25
-1.6
-1.2
-0.8
-0.4
0
0.4
0.8
1.2
1.6
2.0
-2.0
-50 125
MAX6685U40H
S1 = S2 = V
DD
Typical Operating Characteristics
(V
DD
= 3.3V, C
S
= 2200pF, T
A
= +25°C, unless otherwise noted. See Typical Operating Circuits.)
P1-P3P4-P6P7-P7

MAX6685AU75L+T

Mfr. #:
Buy MAX6685AU75L+T
Manufacturer:
Maxim Integrated
Description:
Board Mount Temperature Sensors Remote-Junction Temperature Switch
Lifecycle:
New from this manufacturer.
Delivery:
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