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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6687 Datasheet

Local/Remote Temperature Switches

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MAX6687 pdf
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 VDD, 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. TREMOTE asserts a logic signal when the remote
temperature exceeds the factory-programmed +120°C
or +125°C trip threshold. TLOCAL 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 VDD
3.3V
MAX6687
CS
DXN TREMOTE
µP S1
TLOCAL
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 VDD
TREMOTE
CS MAX6688
DXN
12V
µP S1
S2
TLOCAL
GND
N
________________________________________________________________ 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.


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6687 Datasheet

Local/Remote Temperature Switches

No Preview Available !

MAX6687 pdf
Local/Remote Temperature Switches in a
µMAX Package
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND
VDD, TLOCAL, TREMOTE ............................................-0.3V to +6V
DXN .......................................................................-0.3V to +0.8V
All Other Pins..............................................-0.3V to (VDD + 0.3V)
Input Current .........................................................................5mA
Output Current ....................................................................20mA
Continuous Power Dissipation (TA = +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
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
(VDD = 3V to 5.5V, TA = -40°C to +125°C, unless otherwise noted. Typical values are at VDD = 3.3V and TA = +25°C.) (Note 1)
PARAMETER
Power-Supply Range
Average Supply Current
Supply Current During
Conversion
Power-On Reset (POR) Threshold
POR Threshold Hysteresis
Remote-Diode Temperature
Threshold Accuracy, Rising
Temperature
Internal Temperature Threshold
Accuracy, Rising Temperature
SYMBOL
VDD
IDD
CONDITION
POR VDD falling edge
TTH
TTH
TA = +25°C, VDD = 3.3V
TA = 0°C to +85°C, VDD = 3.3V
TA = -40°C to +125°C, VDD = 3.3V
Temperature trip thresholds from +40°C to
+105°C, VDD = 3.3V
Temperature trip thresholds +110°C and
+115°C, VDD = 3.3V
MIN TYP MAX UNITS
3 5.5 V
215 500
µA
400 800
µA
1 1.5 2.0 V
50 mV
-1.5 +1.5
-3.0
+3.0
°C
-5.0 +5.0
-3.0 +3.0
°C
-3.5 +3.5
Temperature Threshold
Hysteresis
THYST
5.0 °C
Temperature Threshold Supply
Sensitivity
Output Voltage High
Output Voltage Low
Logic Input Low Voltage
(S1, S2)
VOH
VOL
VIL
ISOURCE = 1mA, MAX6688
ISINK = 1mA
VDD - 0.2
0.6 °C/V
V
0.2 V
0.4 V
Logic Input High Voltage
(S1, S2)
VIH
1.8 V
Input Current (S1, S2)
Open-Drain Output Leakage
Current
VOUT = 5.5V, MAX6687
10 µA
1 µA
2 _______________________________________________________________________________________


Part Number MAX6687
Description Local/Remote Temperature Switches
Maker Maxim
Total Page 7 Pages
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