LM56 National Semiconductor, LM56 Datasheet
LM56
Manufacturer Part Number
LM56
Description
Dual Output Low Power Thermostat
Manufacturer
National Semiconductor
Datasheet
1.LM56.pdf
(13 pages)
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© 2000 National Semiconductor Corporation
LM56
Dual Output Low Power Thermostat
General Description
The LM56 is a precision low power thermostat. Two stable
temperature trip points (V
ing down the LM56 1.250V bandgap voltage reference using
3 external resistors. The LM56 has two digital outputs. OUT1
goes LOW when the temperature exceeds T1 and goes
HIGH when the the temperature goes below (T1–T
Similarly, OUT2 goes LOW when the temperature exceeds
T2 and goes HIGH when the temperature goes below
(T2–T
The LM56 is available in an 8-lead Mini-SO8 surface mount
package and 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
n Electronic System Protection
Simplified Block Diagram and Connection Diagram
NS
Package
Number
Transport
Media
Package
Number
Marking
Order
HYST
). T
HYST
LM56BIM LM56BIMX
LM56BIM
SOP-8
M08A
Rail
is an internally set 5˚C typical hysteresis.
T1
2500 Units
and V
LM56BIM
Tape &
SOP-8
M08A
Reel
T2
) are generated by divid-
DS012893
LM56CIM LM56CIMX
LM56CIM
DS012893-1
SOP-8
M08A
Rail
2500 Units
HYST
LM56CIM
Tape &
SOP-8
M08A
Reel
).
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
n Future availability in the 8-pin Mini-SO8 package
Key Specifications
n Temperature Trip Point Accuracy:
n Power Supply Voltage
n Power Supply Current
n V
n Hysteresis Temperature
n Internal Temperature Sensor
+25˚C
+25˚C to +85˚C
−40˚C to +125˚C
LM56BIMM LM56BIMMX
Output Voltage
MUA08A
MSOP-8
REF
T02B
Rail
Tape & Reel
3500 Units
MUA08A
MSOP-8
T02B
±
±
±
2˚C (max)
2˚C (max)
3˚C (max)
LM56BIM
(+6.20 mV/˚C x T) +395 mV
LM56CIMM LM56CIMMX
MUA08A
MSOP-8
T02C
Rail
1.250V
±
±
±
230 µA (max)
DS012893-2
LM56CIM
www.national.com
3˚C (max)
3˚C (max)
4˚C (max)
Tape & Reel
±
3500 Units
2.7V–10V
1% (max)
MUA08A
MSOP-8
April 2000
T02C
5˚C
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