Maker : National Semiconductor
Part No. : M08A

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Product Information

LM66 Dual Output Internally Preset Thermostat April 2000 LM66 Dual Output Internally Preset Thermostat General 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 comparators 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 mV/˚C x T) +400 mV ± 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 www.national.com LM66 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 mA 20 mA 900 mW 1000V 200V Vapor Phase (60 seconds) Infrared (15 seconds) Storage Temperature 215˚C 220˚C −65˚C to + 150˚C Operating Ratings (Note 1) Operating Temperature Range LM66CIM Positive Supply Voltage (V+) Maximum VOUT1 and VOUT2 TMIN ≤ TA ≤ TMAX −40˚C ≤ TA ≤ +125˚C +2.7V to +10V +10V LM66 Electrical Characteristics The following specifications apply for V+ = 2.7 VDC, and VREF load current = 0 µA unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C unless otherwise specified. Typical Symbol Temperature Sensor Trip Point Accuracy (Includes VREF, Comparator Offset, and Temperature Sensitivity errors) Trip Point Hysteresis TA = +73˚C TA = +82˚C Internal Temperature Sensitivity Temperature Sensitivity Error +25˚C ≤ TA ≤ +85˚C −25˚C ≤ TA ≤ +125˚C −40˚C ≤ TA ≤ −25˚C Output Impedance Line Regulation −1 µA ≤ IL ≤ +40 µA +3.0V ≤ V+ ≤ +10V, +25˚C ≤ TA ≤ +85˚C +3.0V ≤ V+ ≤ +10V, −40˚C ≤ TA < 25˚C +2.7V ≤ V+ ≤ +3.3V VREF Output VREF VREF Nominal VREF Error ∆VREF/∆V+ Line Regulation +3.0V ≤ V+ ≤ +10V +2.7V ≤ V+ ≤ +3.3V 0.13 0.15 1.250V V 6 6 +6.20 4.5 7.5 4.5 7.5 ˚C (min) ˚C (max) ˚C (min) ˚C (max) mV/˚C ˚C (max) ˚C (max) ˚C (max) Ω (max) mV/V (max) mV/V (max) mV (max) +25˚C ≤ TA ≤ +85˚C Parameter Conditions (Note 6) LM66CIM Limits (Note 7) Units (Limits) ±3 ˚C (max) ±3 ±4 ±5 1500 ± 0.36 ± 0.61 ± 2.3 ± 1.4 ± 17.5 0.21 1.5 % (max) mV (max) mV/V (max) mV (max) www.national.com 2 LM66 LM66 Electrical Characteristics The following specifications apply for V+ = 2.7 VDC, and VREF load current = 50 µA unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25˚C unless otherwise specified. Symbol V+ Power Supply IS Digital Output(s) IOUT(“1”) VOUT(“0”) Logical “1” Output Leakage Cur...

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