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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 5C 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 3C (max) n Temperature Trip Point Accuracy n T1 set point +73C n T2 set point +82C 2.7V to 10V 250 A (max) 1.250V 1.4% (max) 5C
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
(c) 2000 National Semiconductor Corporation
DS100854
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LM66
Absolute Maximum Ratings (Note 1)
Input Voltage Input Current at any pin (Note 2) Package Input Current (Note 2) Package Dissipation at TA = 25C (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
215C 220C -65C to + 150C
Operating Ratings (Note 1)
Operating Temperature Range LM66CIM Positive Supply Voltage (V+) Maximum VOUT1 and VOUT2 TMIN TA TMAX -40C TA +125C +2.7V to +10V +10V
LM66 Electrical Characteristics
The following specifications apply for V+ = 2.7 VDC, and VREF load current = 0 A unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C unless otherwise specified. Typical Symbol Temperature Sensor Trip Point Accuracy (Includes VREF, Comparator Offset, and Temperature Sensitivity errors) Trip Point Hysteresis TA = +73C TA = +82C Internal Temperature Sensitivity Temperature Sensitivity Error +25C TA +85C -25C TA +125C -40C TA -25C Output Impedance Line Regulation -1 A IL +40 A +3.0V V+ +10V, +25C TA +85C +3.0V V+ +10V, -40C TA < 25C +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) (max) mV/V (max) mV/V (max) mV (max) +25C TA +85C 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)
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LM66
LM66 Electrical Characteristics
The following specifications apply for V+ = 2.7 VDC, and VREF load current = 50 A unless otherwise specified. Boldface limits apply for TA = TJ = TMIN to TMAX; all other limits TA = TJ = 25C unless otherwise specified. Symbol V+ Power Supply IS Digital Output(s) IOUT("1") VOUT("0") Logical "1" Output Leakage Current Logical "0" Output Voltage V+ = +5.0V IOUT = +50 A 1 0.4 A (max) V (max) Supply Current V+ = +10V V+ = +2.7V 250 250 A (max) A (max) Parameter Conditions Typical (Note 6) Limits (Note 7) Units (Limits)
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), JA (junction to ambient thermal resistance) and TA (ambient temperature). The maximum allowable power dissipation at any temperature is PD = (TJmax-TA)/JA or the number given in the Absolute Maximum Ratings, whichever is lower. For this device, TJmax = 125C. For this device the typical thermal resistance (JA) of the different package types when board mounted follow:
Package Type M08A
JA 110C/W
Note 4: The human body model is a 100 pF capacitor discharge through a 1.5 k 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 = 25C and represent most likely parametric norm. Note 7: Limits are guaranteed to National's AOQL (Average Outgoing Quality Level).
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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 = 73C, T2 = 82C, OUT1 and OUT2 set as active-low open-collector outputs with OUT1 mapped to pin 7 and OUT2 mapped to pin 6. v, w, x and y B C D F G H J K L N Temperature (C) -5 -4 -3 -2 -1 -0 1 2 3 4 v, w, x and y P Q R S T V X Y Z Temperature (C) 5 6 7 8 9 10 11 12 13
The value of z describes the assignment/function of OUT1 and OUT2 as shown in the following table: Active Low//High 0 0 0 0 1 1 1 1 Open Collector/ Totem Pole 0 0 1 1 0 0 1 1 Mapping Value of z Function of OUT1 and OUT2
0 1 0 1 0 1 0 1
B C D F G H J K
Active-Low, Open-Collector, OUT1 mapped to pin 7, OUT2 mapped to pin 6 Active-Low, Open-Collector, OUT1 mapped to pin 6, OUT2 mapped to pin 7 Active-Low, Totem Pole, OUT1 mapped to pin 7, OUT2 mapped to pin 6 Active-Low, Totem Pole, OUT1 mapped to pin 6, OUT2 mapped to pin 7 Active-High, Open-Collector, OUT1 mapped to pin 7, OUT2 mapped to pin 6 Active-High, Open-Collector, OUT1 mapped to pin 6, OUT2 mapped to pin 7 Active-High, Totem Pole, OUT1 mapped to pin 7, OUT2 mapped to pin 6 Active-High, Totem Pole, OUT1 mapped to pin 6, OUT2 mapped to pin 7
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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. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the user.
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2. A critical component is any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness.
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National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications.

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