LM66 National Semiconductor, LM66 Datasheet

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LM66

Manufacturer Part Number
LM66
Description
Dual Output Internally Preset Thermostat
Manufacturer
National Semiconductor
Datasheet

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© 2000 National Semiconductor Corporation
LM66
Dual Output Internally Preset Thermostat
General Description
The LM66 is a precision low power thermostat. Two stable
temperature trip points (V
ing down the LM66 1.250V bandgap voltage reference using
a resistors divider network. The LM66 has two digital out-
puts. OUT1 goes LOW when the temperature exceeds T1
and goes HIGH when the the temperature goes below
(T1–T
ture exceeds T2 and goes HIGH when the temperature goes
below (T2–T
teresis.
The LM66 is currently available in an 8-lead small outline
package.
Applications
n Microprocessor Thermal Management
n Appliances
n Portable Battery Powered 3.0V or 5V Systems
n Fan Control
n Industrial Process Control
n HVAC Systems
n Remote Temperature Sensing
Simplified Block Diagram and
Connection Diagram
HYST
). Similarly, OUT2 goes LOW when the tempera-
HYST
). T
HYST
T1
is an internally set 5˚C typical hys-
and V
T2
) are generated by divid-
DS100854-1
DS100854
DS100854-2
n Electronic System Protection
Features
n Digital outputs support TTL logic levels
n Internal temperature sensor
n 2 internal comparators with hysteresis
n Internal voltage reference
n Currently available in 8-pin SO plastic package
Key Specifications
n Temperature Trip Point Accuracy
n T1 set point
n T2 set point
Ordering Information
Typical Application
n Power Supply Voltage
n Power Supply Current
n V
n Hysteresis Temperature
n Internal Temperature Sensor
NS Tackage
Number
Transport Media
Order Number
Output Voltage
REF
LM66CIM-
TABLE 1.
Bulk Rail
RLSKB
M08A
(+6.20 mV/˚C x T) +400 mV
1.250V
DS100854-3
2500 Units Tape
LM66CIMX-
RLSKB
& Reel
250 µA (max)
M08A
±
www.national.com
2.7V to 10V
1.4% (max)
±
April 2000
3˚C (max)
+73˚C
+82˚C
5˚C

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LM66 Summary of contents

Page 1

... T2 and goes HIGH when the temperature goes below (T2– internally set 5˚C typical hys- HYST HYST teresis. The LM66 is currently available in an 8-lead small outline package. Applications n Microprocessor Thermal Management n Appliances n Portable Battery Powered 3. Systems n Fan Control ...

Page 2

... Input Current at any pin (Note 2) Package Input Current (Note 2) Package Dissipation 25˚C A (Note 3) ESD Susceptibility (Note 4) Human Body Model Machine Model Soldering Information SO Package (Note 5) : LM66 Electrical Characteristics The following specifications apply for V its apply for MIN MAX Symbol ...

Page 3

... LM66 Electrical Characteristics The following specifications apply for V its apply for MIN MAX Symbol Parameter + V Power Supply I Supply Current S Digital Output(s) I Logical “1” Output Leakage OUT(“1”) Current V Logical “0” Output Voltage OUT(“0”) Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur ...

Page 4

... The place holders xy describe the set point shown in the following table. z=0 (Other assignments are reserved.) For example the part number LM66CIM-RLSKB has 73˚ 82˚C, OUT1 and OUT2 set as active-low open-collector outputs with OUT1 mapped to pin 7 and OUT2 mapped to pin 6. ...

Page 5

... National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. inches (millimeters) unless otherwise noted Order Number LM66CIM or LM66CIMX NS Package Number M08A 2 ...

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