LM66 Dual Output Internally Preset Thermostat General Description n Electronic System Protection 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. Features 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 2.7V to 10V n Power Supply Current 250 µA (max) 1.250V ± 1.4% (max) n VREF Applications n n n n n n n n n n n n n Hysteresis Temperature Microprocessor Thermal Management Appliances Portable Battery Powered 3.0V or 5V Systems Fan Control Industrial Process Control HVAC Systems Remote Temperature Sensing 5˚C 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 Simplified Block Diagram and Connection Diagram Ordering Information TABLE 1. Order Number NS Tackage Number Transport Media DS100854-1 DS100854 LM66CIMXRLSKB M08A M08A Bulk Rail 2500 Units Tape & Reel Typical Application DS100854-2 © 2000 National Semiconductor Corporation LM66CIMRLSKB DS100854-3 www.national.com LM66 Dual Output Internally Preset Thermostat April 2000 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) : Vapor Phase (60 seconds) Infrared (15 seconds) Storage Temperature 12V 5 mA 20 mA 215˚C 220˚C −65˚C to + 150˚C Operating Ratings (Note 1) 900 mW TMIN ≤ TA ≤ TMAX −40˚C ≤ TA ≤ +125˚C +2.7V to +10V +10V Operating Temperature Range LM66CIM Positive Supply Voltage (V+) Maximum VOUT1 and VOUT2 1000V 200V 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. Symbol Parameter Conditions Typical LM66CIM Units (Note 6) Limits (Limits) (Note 7) Temperature Sensor Trip Point Accuracy (Includes VREF, Comparator Offset, and +25˚C ≤ TA ≤ +85˚C ±3 ˚C (max) Temperature Sensitivity errors) Trip Point Hysteresis TA = +73˚C TA = +82˚C Internal Temperature Sensitivity 6 6 4.5 ˚C (min) 7.5 ˚C (max) 4.5 ˚C (min) 7.5 ˚C (max) ˚C (max) +6.20 +25˚C ≤ TA ≤ +85˚C mV/˚C −40˚C ≤ TA ≤ −25˚C ±3 ±4 ±5 Output Impedance −1 µA ≤ IL ≤ +40 µA 1500 Ω (max) Line Regulation +3.0V ≤ V+ ≤ +10V, +25˚C ≤ TA ≤ +85˚C ± 0.36 mV/V (max) +3.0V ≤ V+ ≤ +10V, −40˚C ≤ TA < 25˚C ± 0.61 mV/V (max) +2.7V ≤ V+ ≤ +3.3V ± 2.3 mV (max) ± 1.4 ± 17.5 % (max) mV (max) Temperature Sensitivity Error −25˚C ≤ TA ≤ +125˚C ˚C (max) ˚C (max) VREF Output VREF VREF Nominal 1.250V VREF Error ∆VREF/∆V+ www.national.com Line Regulation V +3.0V ≤ V+ ≤ +10V 0.13 0.21 mV/V (max) +2.7V ≤ V+ ≤ +3.3V 0.15 1.5 mV (max) 2 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 Parameter Conditions Typical Limits Units (Note 6) (Note 7) (Limits) V+ = +10V 250 µA (max) V+ = +2.7V 250 µA (max) 1 µA (max) 0.4 V (max) V+ Power Supply IS Supply Current Digital Output(s) IOUT(“1”) Logical “1” Output Leakage Current V+ = +5.0V VOUT(“0”) Logical “0” Output Voltage IOUT = +50 µA Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test conditions. Note 2: When the input voltage (VI) at any pin exceeds the power supply (VI < GND or VI > V+), the current at that pin should be limited to 5 mA. The 20 mA maximum package input current rating limits the number of pins that can safely exceed the power supplies with an input current of 5 mA to four. Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJmax (maximum junction temperature), θJA (junction to ambient thermal resistance) and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD = (TJmax–TA)/θJA or the number given in the Absolute Maximum Ratings, whichever is lower. For this device, TJmax = 125˚C. For this device the typical thermal resistance (θJA) of the different package types when board mounted follow: Package Type θJA M08A 110˚C/W Note 4: The human body model is a 100 pF capacitor discharge through a 1.5 kΩ resistor into each pin. The machine model is a 200 pF capacitor discharged directly into each pin. Note 5: See AN450 “Surface Mounting Methods and Their Effects on Product Reliability” or the section titled “Surface Mount” found in any post 1986 National Semiconductor Linear Data Book for other methods of soldering surface mount devices. Note 6: Typicals are at TJ = TA = 25˚C and represent most likely parametric norm. Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level). 3 www.national.com LM66 LM66 Electrical Characteristics LM66 Part Number Template The series of digits labled vw xy z in the part number LM66CIM-vw xy z, describe the set points and the function of OUT1 and OUT2 as follows: The place holders v w describe the set point of T1 as shown in the following table. The place holders xy describe the set point of T2 as shown in the following table. z=0 (Other assignments are reserved.) For example the part number LM66CIM-RLSKB has: T1 = 73˚C, T2 = 82˚C, OUT1 and OUT2 set as active-low open-collector outputs with OUT1 mapped to pin 7 and OUT2 mapped to pin 6. Temperature (˚C) v, w, x and y Temperature (˚C) −5 P 5 C −4 Q 6 D −3 R 7 8 v, w, x and y B F −2 S G −1 T 9 H −0 V 10 1 X 11 2 Y 12 L 3 Z 13 N 4 J K The value of z describes the assignment/function of OUT1 and OUT2 as shown in the following table: Active Low//High Open Collector/ Totem Pole Mapping Value of z 0 0 0 B Active-Low, Open-Collector, OUT1 mapped to pin 7, OUT2 mapped to pin 6 0 0 1 C Active-Low, Open-Collector, OUT1 mapped to pin 6, OUT2 mapped to pin 7 0 1 0 D Active-Low, Totem Pole, OUT1 mapped to pin 7, OUT2 mapped to pin 6 0 1 1 F Active-Low, Totem Pole, OUT1 mapped to pin 6, OUT2 mapped to pin 7 1 0 0 G Active-High, Open-Collector, OUT1 mapped to pin 7, OUT2 mapped to pin 6 1 0 1 H Active-High, Open-Collector, OUT1 mapped to pin 6, OUT2 mapped to pin 7 1 1 0 J Active-High, Totem Pole, OUT1 mapped to pin 7, OUT2 mapped to pin 6 1 1 1 K Active-High, Totem Pole, OUT1 mapped to pin 6, OUT2 mapped to pin 7 www.national.com Function of OUT1 and OUT2 4 LM66 Dual Output Internally Preset Thermostat Physical Dimensions inches (millimeters) unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC Order Number LM66CIM or LM66CIMX NS Package Number M08A LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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