MAX6685 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Dual-Output Remote-Junction Temperature Switches

19-2459; Rev 2; 4/03
Dual-Output Remote-Junction
Temperature Switches
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
CPU Temperature
Protection
Fan Control
Multichip Modules
FPGA Temperature
Protection
Features
o Pin-Programmed Lower Temperature Threshold
from +40°C to +80°C or +75°C to +115°C
(5°C Increments)
o Preset Upper Threshold: +120°C or +125°C
o Open-Drain, Active-Low Output for Upper
Temperature Alarm
o CMOS Push-Pull, Active-High or Open-Drain,
Active-Low Output for Lower Temperature Alarm
o 1.5°C Accuracy
o 3.0V to 5.5V, 200µA Supply
o 8-Pin µMAX Package
Pin Configurations appear at end of data sheet.
Ordering Information
PART
MAX6685AU40L
MAX6685AU40H
MAX6685AU75L
MAX6685AU75H
MAX6686AU40L
MAX6686AU40H
MAX6686AU75L
MAX6686AU75H
T_LOW
OUTPUT
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
T_LOW TRIP
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
T_HIGH TRIP
THRESHOLD (0°C)
+120°C
+125°C
+120°C
+125°C
+120°C
+125°C
+120°C
+125°C
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
Typical Operating Circuits
3 3V
TO SYSTEM
SHUTDOWN
CPU
V_DD
DXP
T_{H GH}
12V
CPU
3.3V
V_DD
DXP
T_{H GH}
TO SYSTEM
SHUTDOWN
C_{S MAX6685}
DXN
S1
S2
T_LOW
N
GND
C_S
MAX6686
DXN
S1
S2
T_LOW
GND
TO CLOCK
THROTTLE
CONTROL
________________________________________________________________ Maxim Integrated Products 1
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