Datasheet LM66CIM-RLSKB Datasheet (NSC)

LM66
Dual Output Internally Preset Thermostat

General Description

The LM66 is a precision low power thermostat. Two stable
temperature trip points (V

T1

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–T

HYST

). Similarly, OUT2 goes LOW when the tempera­ture exceeds T2 and goes HIGH when the temperature goes
below (T2–T

HYST

). T

HYST

is an internally set 5˚C typical hys-

teresis.
The LM66 is currently available in an 8-lead small outline

package.

Applications

n Microprocessor Thermal Management
n Appliances
n Portable Battery Powered 3.0V or 5V Systems
n Fan Control
n Industrial Process Control
n HVAC Systems
n Remote Temperature Sensing

n Electronic System Protection

Features

n Digital outputs support TTL logic levels
n Internal temperature sensor
n 2 internal comparators with hysteresis
n Internal voltage reference
n 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)
n V

REF

1.250V±1.4% (max)

n Hysteresis Temperature 5˚C
n Internal Temperature Sensor

Output Voltage (+6.20 mV/˚C x T) +400 mV

n Temperature Trip Point Accuracy

±

3˚C (max)

n T1 set point +73˚C
n T2 set point +82˚C

Simplified Block Diagram and
Connection Diagram

Ordering Information

TABLE 1.

Order Number LM66CIM-

RLSKB

LM66CIMX-

RLSKB

NS Tackage
Number

M08A M08A

Transport Media Bulk Rail 2500 Units Tape

& Reel

Typical Application

DS100854-1

DS100854-2

DS100854-3

April 2000

LM66 Dual Output Internally Preset Thermostat

© 2000 National Semiconductor Corporation DS100854 www.national.com

Absolute Maximum Ratings (Note 1)

Input Voltage 12V
Input Current at any pin (Note 2) 5 mA
Package Input Current (Note 2) 20 mA
Package Dissipation at T

A

= 25˚C

(Note 3) 900 mW

ESD Susceptibility (Note 4)

Human Body Model 1000V
Machine Model 200V

Soldering Information

SO Package (Note 5) :

Vapor Phase (60 seconds) 215˚C
Infrared (15 seconds) 220˚C

Storage Temperature −65˚C to + 150˚C

Operating Ratings (Note 1)

Operating Temperature Range T

MIN

≤ TA≤ T

MAX

LM66CIM −40˚C ≤ TA≤ +125˚C
Positive Supply Voltage (V

+

) +2.7V to +10V

Maximum V

OUT1

and V

OUT2

+10V

LM66 Electrical Characteristics

The following specifications apply for V+= 2.7 VDC, and V

REF

load current = 0 µA unless otherwise specified. Boldface lim-

its apply for TA=TJ=T

MIN

to T

MAX

; all other limits TA=TJ= 25˚C unless otherwise specified.

Typical LM66CIM Units

Symbol Parameter Conditions (Note 6) Limits (Limits)

(Note 7)

Temperature Sensor

Trip Point Accuracy (Includes
V

REF

, Comparator Offset, and +25˚C ≤ TA≤ +85˚C

±

3 ˚C (max)
Temperature Sensitivity errors)
Trip Point Hysteresis T

A

= +73˚C 6 4.5 ˚C (min)

7.5 ˚C (max)

T

A

= +82˚C 6 4.5 ˚C (min)

7.5 ˚C (max)
Internal Temperature Sensitivity +6.20 mV/˚C
Temperature Sensitivity Error +25˚C ≤ T

A

≤ +85˚C

±

3 ˚C (max)

−25˚C ≤ T

A

≤ +125˚C

±

4 ˚C (max)

−40˚C ≤ T

A

≤ −25˚C

±

5 ˚C (max)

Output Impedance −1 µA ≤ I

L

≤ +40 µA 1500 Ω (max)

Line Regulation +3.0V ≤ V

+

≤ +10V,

+25˚C ≤ T

A

≤ +85˚C

±

0.36 mV/V (max)

+3.0V ≤ V

+

≤ +10V,

−40˚C ≤ T

A

<

25˚C

±

0.61 mV/V (max)

+2.7V ≤ V

+

≤ +3.3V

±

2.3 mV (max)

V

REF

Output

V

REF

V

REF

Nominal 1.250V V

V

REF

Error

±

1.4 % (max)

±

17.5 mV (max)

∆V

REF

/∆V

+

Line Regulation +3.0V ≤ V+≤ +10V 0.13 0.21 mV/V (max)

+2.7V ≤ V

+

≤ +3.3V 0.15 1.5 mV (max)

LM66

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LM66 Electrical Characteristics

The following specifications apply for V+= 2.7 VDC, and V

REF

load current = 50 µA unless otherwise specified. Boldface lim-

its apply for TA=TJ=T

MIN

to T

MAX

; all other limits TA=TJ= 25˚C unless otherwise specified.

Symbol Parameter Conditions Typical Limits Units

(Note 6) (Note 7) (Limits)

V

+

Power Supply

I

S

Supply Current V+= +10V 250 µA (max)

V

+

= +2.7V 250 µA (max)

Digital Output(s)

I

OUT(“1”)

Logical “1” Output Leakage
Current

V+= +5.0V

1 µA (max)

V

OUT(“0”)

Logical “0” Output Voltage I

OUT

= +50 µA 0.4 V (max)

Note 1: Absolute MaximumRatings indicate limitsbeyond which damageto the devicemay occur.Operating Ratingsindicate conditions forwhich the deviceis func­tional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteedspeci­fications 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(V

I

) at anypin exceeds the power supply (V

I

<

GND or V

I

>

V+), the currentat that pin should be limitedto 5 mA. The 20mA maxi-

mum 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 temperaturesand is dictated by T

Jmax

(maximum junction temperature), θJA(junction to am-

bient thermal resistance) andT

A

(ambient temperature). Themaximum allowable power dissipation at any temperatureis PD=(T

Jmax–TA

)/θJAor the number given

in the Absolute Maximum Ratings, whichever is lower. For this device, T

Jmax

= 125˚C. For this device the typical thermal resistance (θJA) of the different package

types when board mounted follow:

Package Type θ

JA

M08A 110˚C/W

Note 4: The humanbody model isa 100 pFcapacitor discharge througha 1.5 kΩresistor into each pin. Themachine model isa 200 pFcapacitor dischargeddirectly
into each pin.

Note 5: See AN450“Surface Mounting Methods andTheir Effects onProduct Reliability” or thesection titled “Surface Mount”found in any post1986 National Semi­conductor Linear Data Book for other methods of soldering surface mount devices.

Note 6: Typicals are at T

J=TA

= 25˚C and represent most likely parametric norm.

Note 7: Limits are guaranteed to National’s AOQL(Average Outgoing Quality Level).

LM66

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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.

v, w, x and y Temperature (˚C)

B−5
C−4
D−3
F−2
G−1
H−0

J1
K2
L3
N4

v, w, x and y Temperature (˚C)

P5
Q6
R7
S8
T9
V10
X11
Y12
Z13

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 Function of OUT1 and OUT2

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

LM66

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Physical Dimensions inches (millimeters) unless otherwise noted

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.

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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www.national.com

8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC

Order Number LM66CIM or LM66CIMX

NS Package Number M08A

LM66 Dual Output Internally Preset Thermostat

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.