LM66 datasheet(1/5 Pages) NSC

Teilenummer	LM66

Bauteilbeschribung	Dual Output Internally Preset Thermostat

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Hersteller	NSC [National Semiconductor (TI)]

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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 divid-

ing down the LM66 1.250V bandgap voltage reference using

a resistors divider network. The LM66 has two digital out-

puts. 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 tempera-

ture exceeds T2 and goes HIGH when the temperature goes

below (T2–T

HYST). THYST 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

Transport Media

Bulk Rail

2500 Units Tape

& Reel

Typical Application

DS100854-1

DS100854-2

DS100854-3

April 2000

DS100854

www.national.com

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