LM66 Datasheet | National Semiconductor

Description The LM66 is a precision low power thermostat. Two stable temperature trip points (VT1 and VT2) are generated by dividing down the LM66 1.250V bandgap voltage reference using a resistors divider network. The LM66 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 LM66 is currently available in an 8-lead small outline package. n Electronic System Protection Features n n n n n Digital outputs support TTL logic levels Internal temperature sensor 2 internal parators with hysteresis Internal voltage reference Currently available in 8-pin SO plastic package Key Specifications n Power Supply Voltage n Power Supply Current n VREF n Hysteresis Temperature n Internal Temperature Sensor Output Voltage (+6.20 m V/˚C x T) +400 m V ± 3˚C (max) n Temperature Trip Point Accuracy n T1 set point +73˚C n T2 set point +82˚C 2.7V to 10V 250 µA (max) 1.250V ± 1.4% (max) 5˚C Applications n n n n n n n Microprocessor Thermal Management Appliances Portable Battery Powered 3.0V or 5V Systems Fan Control Industrial Process Control HVAC Systems Remote Temperature Sensing Simplified Block Diagram and Connection Diagram Ordering Information TABLE 1. Order Number NS Tackage Number Transport Media LM66CIMRLSKB M08A Bulk Rail LM66CIMXRLSKB M08A 2500 Units Tape & Reel DS100854-1 Typical Application DS100854-2 DS100854-3 © 2000 National Semiconductor Corporation DS100854 .national. Absolute Maximum Ratings (Note 1) Input Voltage Input Current at any pin (Note 2) Package Input Current (Note 2) Package Dissipation at TA = 25˚C (Note 3) ESD Susceptibility (Note 4) Human Body Model Machine Model Soldering Information SO Package (Note 5) : 12V 5 m A 20 m A 900 m W 1000V 200V Vapor Phase (60 seconds) Infrared (15 seconds) Storage...