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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX6685 Datasheet

(MAX6685 / MAX6686) Dual-Output Remote-Junction Temperature Switches

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MAX6685 pdf
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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 (THIGH
and TLOW). THIGH asserts a logic signal when the remote
temperature crosses the factory-programmed, +120°C, or
+125°C upper trip threshold. TLOW 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.
THIGH is an open-drain, active-low output for both the
MAX6685 and the MAX6686. TLOW 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
TLOW
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
TLOW 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
THIGH 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
VDD
DXP THIGH
12V
CPU
3.3V
VDD
DXP THIGH
TO SYSTEM
SHUTDOWN
CS MAX6685
DXN
S1
S2 TLOW
GND
N
CS MAX6686
DXN
S1
S2 TLOW
GND
TO CLOCK
THROTTLE
CONTROL
________________________________________________________________ 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

MAX6685 Datasheet

(MAX6685 / MAX6686) Dual-Output Remote-Junction Temperature Switches

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MAX6685 pdf
Dual-Output Remote-Junction
Temperature Switches
ABSOLUTE MAXIMUM RATINGS
Voltages Referenced to GND
VDD, TLOW, THIGH.....................................................-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 = 3.0V 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
SYMBOL
CONDITION
MIN TYP MAX UNITS
Power-Supply Range
Average Supply Current
Supply Current During
Conversion
VDD
IDD
3.0 5.5
200 500
400 800
V
µA
µA
Power-On Reset Threshold
POR Threshold Hysteresis
POR VDD falling edge
1.0 1.5 2.0
V
50 mV
Temperature Threshold
Accuracy
Temperature Threshold
Hysteresis
TTH
THYST
VDD = 3.3V, TA = +25°C, TRJ = 0°C to +125°C
(Note 2)
TA = 0°C to +100°C, TRJ = 0°C to +125°C
-1.5
+1.5
2.0
5.0
°C
°C
Supply Sensitivity of Temperature
Threshold
TA = +25°C, TRJ = 0°C to +125°C,
VDD = 3.0V to 5.5V
0.6 °C/V
Output Voltage High
VOH ISOURCE = 1mA, MAX6685 TLOW only
VDD -
0.2
V
Output Voltage Low
Logic-Low Input Voltage
Logic-High Input Voltage
Input Current
VOL ISINK = 1mA
VIL S1, S2
VIH S1, S2
S1, S2
0.2 V
0.4 V
1.8 V
10 µA
Open-Drain Output Leakage
Current
VOUT = 5.5V, TLOW and THIGH
1 µA
Conversion Time
0.09 0.11 0.13
s
Sample Period
0.35 0.45 0.55
s
Current Sourcing for External
Diode
High level
Low level
80 100 120
µA
8 10 12
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: TRJ is the temperature of the remote-sensing diode junction.
2 _______________________________________________________________________________________


Part Number MAX6685
Description (MAX6685 / MAX6686) Dual-Output Remote-Junction Temperature Switches
Maker Maxim Integrated Products
Total Page 7 Pages
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