MAX6687 Datasheet, PDF (1/7 Pages) Maxim Integrated Products – Local/Remote Temperature Switches in a μMAX Package

19-2636; Rev 2; 11/03
Local/Remote Temperature Switches in a
µMAX Package
General Description
The MAX6687/MAX6688 comprise a remote-junction
temperature switch and a local temperature switch in a
single package. The remote-junction switch uses an
external P-N junction (typically a diode-connected tran-
sistor on the die of an external CPU, ASIC, or FPGA) as
a sensing element to measure the remote temperature.
The remote-junction temperature switch has a factory-
programmed trip temperature threshold of either
+120°C or +125°C. The local temperature switch has a
pin-programmable temperature threshold that is set by
connecting pins S1 and S2 to ground, to V_DD, or leav-
ing them floating. Hysteresis for both local and remote
thresholds is 5°C. The MAX6687/MAX6688 do not
assert on transient (single-sample) faults or when
power is first applied.
The MAX6687 has two open-drain active-low outputs
while the MAX6688 has two push-pull active-high out-
puts. T_REMOTE asserts a logic signal when the remote
temperature exceeds the factory-programmed +120°C
or +125°C trip threshold. T_LOCAL is asserted when the
die temperature exceeds the pin-programmed thresh-
old, which is controlled by pins S1 and S2. The local
thresholds are available in two ranges in 5°C incre-
ments. The two ranges are +40°C to +80°C and +75°C
to +115°C.
The MAX6687/MAX6688 operate from a 3.0V to 5.5V
power supply and are available in a space-saving 8-pin
µMAX package.
Applications
CPU Temperature Protection
FPGA Temperature Protection
Fan Control
Temperature Alarms
3.3V
DXP
V_DD
3.3V
MAX6687
C_S
DXN
T_REMOTE
µP
S1
T_LOCAL
S2
GND
TO SYSTEM
SHUTDOWN
Features
o Pin-Programmable Local Temperature Threshold
in 5°C Increments in Two Distinct Ranges: +40°C
to +80°C and +75°C to +115°C
o Factory-Programmed Remote Threshold:
+120°C (L Suffix) or +125°C (H Suffix)
o Open-Drain Active-Low Outputs (MAX6687)
o CMOS Push-Pull, Active-High Outputs (MAX6688)
o ±1.5°C Accuracy
o 2Hz Temperature Sampling Rate
o 215µA Average Supply Current
o 3.0V to 5.5V Power-Supply Voltage
o 8-Pin µMAX Package
PART
MAX6687AU40L
MAX6687AU40H
MAX6687AU75L
MAX6687AU75H
MAX6688AU40L
MAX6688AU40H
MAX6688AU75L
MAX6688AU75H
Ordering Information
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
8 µMAX
Pin Configurations/Functional Diagrams/Selector Guide
appear at end of data sheet.
Typical Operating Circuit
3.3V
TO SYSTEM
SHUTDOWN
DXP
V_DD
T_REMOTE
C_S
MAX6688
12V
DXN
µP
S1
S2
T_LOCAL
N
GND
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