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FEATURES

? Digital Outputs Support TTL Logic Levels

? Internal Temperature Sensor

? 2 Internal Comparators with Hysteresis

? Internal Voltage Reference

? Available in 8-pin SOIC and VSSOP Packages

APPLICATIONS

? Microprocessor Thermal Management

? Appliances

? Portable Battery Powered 3.0V or 5V Systems

? Fan Control

? Industrial Process Control

? HVAC Systems

? Remote Temperature Sensing

? Electronic System Protection

DESCRIPTION

The LM56 is a precision low power thermostat. Two

stable temperature trip points (VT1 and VT2) are

generated by dividing 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–THYST).

Similarly, OUT2 goes LOW when the temperature

exceeds T2 and goes HIGH when the temperature

goes below (T2–THYST). THYST is an internally set 5°C

typical hysteresis.

The LM56 is available in an 8-lead VSSOP surface

mount package and an 8-lead SOIC.