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19-2459; Rev 2; 4/03
Dual-Output Remote-Junction
Temperature Switches
General Description
Features
MAX6685/MAX6686 are dual-output temperature switches
that use an external diode-connected transistor as a sens-
ꢀ Pin-Programmed Lower Temperature Threshold
from +40°C to +80°C or +75°C to +115°C
(5°C Increments)
ing element. These devices have two logic outputs (T
HIGH
and T
). T
asserts a logic signal when the remote
LOW
HIGH
ꢀ Preset Upper Threshold: +120°C or +125°C
temperature crosses the factory-programmed, +120°C, or
+125°C upper trip threshold. T is asserted when the
LOW
ꢀ Open-Drain, Active-Low Output for Upper
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.
Temperature Alarm
ꢀ CMOS Push-Pull, Active-High or Open-Drain,
Active-Low Output for Lower Temperature Alarm
ꢀ 1.5°C Accuracy
T
is an open-drain, active-low output for both the
HIGH
ꢀ 3.0V to 5.5V, 200µA Supply
ꢀ 8-Pin µMAX Package
MAX6685 and the MAX6686. T
is a CMOS push-pull,
LOW
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
CPU Temperature
Protection
Multichip Modules
FPGA Temperature
Protection
Pin Configurations appear at end of data sheet.
Fan Control
Ordering Information
T
T
TRIP
T
TRIP
HIGH
LOW
LOW
PART
PIN-PACKAGE
OUTPUT
RANGE (0°C)
+40°C to +80°C
+40°C to +80°C
+75°C to +115°C
+75°C to +115°C
+40°C to +80°C
+40°C to +80°C
+75°C to +115°C
+75°C to +115°C
THRESHOLD (0°C)
MAX6685AU40L
MAX6685AU40H
MAX6685AU75L
MAX6685AU75H
MAX6686AU40L
MAX6686AU40H
MAX6686AU75L
MAX6686AU75H
Push-pull, active high
Push-pull, active high
Push-pull, active high
Push-pull, active high
Open drain, active low
Open drain, active low
Open drain, active low
Open drain, active low
+120°C
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
+125°C
+120°C
+125°C
+120°C
+125°C
+120°C
+125°C
Typical Operating Circuits
3.3V
3.3V
TO SYSTEM
SHUTDOWN
V
V
DD
DD
TO SYSTEM
SHUTDOWN
12V
DXP
DXP
T
T
HIGH
HIGH
CPU
CPU
C
S
C
S
MAX6685
MAX6686
DXN
S1
DXN
S1
TO CLOCK
THROTTLE
CONTROL
T
T
LOW
N
LOW
S2
S2
GND
GND
________________________________________________________________ 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.