2-25

TELCOM SEMICONDUCTOR, INC.

7

6

5

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3

1

2

8

3V, DUAL TRIP POINT TEMPERATURE SENSOR

TC623

FEATURES

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Integrated Temp Sensor and Detector Operate

from a Supply Voltage as Low as 2.7V

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Replaces Mechanical Thermostats and Switches

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On-Chip Temperature Sense

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8-Pin DIP or SOIC for Direct PCB Mounting

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2 User-Programmable Temperature Set Points

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2 Independent Temperature Limit Outputs

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Heat/Cool Regulate Output

APPLICATIONS

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CPU Thermal Management

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System Over-or Under-Temperature Shutdown

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Advanced Thermal Warning

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Fan Speed Control Circuits

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Accurate Appliance Temperature Sensing

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Environmental Control

GENERAL DESCRIPTION

The TC623 is a 3V solid-state, programmable tempera-

ture sensor designed for use in thermal management appli-

cations. It features dual thermal interrupt outputs (LOW

LIMIT and HIGH LIMIT) each of which program with a single

external resistor. The HIGH LIMIT and LOW LIMIT outputs

are driven active (high) when measured temperature equals

the user-programmed limits. The CONTROL output is driven

active (high) when temperature equals the HIGH LIMIT

setpoint, and turned off when temperature falls below the

LOW LIMIT setpoint. The CONTROL output can be used to

provide simple ON/OFF control to a cooling fan if so desired.

Low voltage operation, easy setpoint programming,

small size and low cost make the TC623 an ideal choice for

many thermal management applications.

ORDERING INFORMATION

Temperature

Part No.

Package

Range

TC623CCOA

8-Pin SOIC

0

°C to +70°C

TC623CCPA

8-Pin Plastic DIP

0

°C to +70°C

TC623CEOA

8-Pin SOIC

– 40

°C to +85°C

TC623CEPA

8-Pin Plastic DIP

– 40

°C to +85°C

TC623CVOA

8-Pin SOIC

– 40

°C to +125°C

FUNCTIONAL BLOCK DIAGRAM

3

HIGH SET

2

LOW SET

1

NC

4

GND

5

CONTROL

6

HIGH LIMIT

VCC

7

LOW LIMIT

8

LATCH

Q

S

R

+

+

–

–

TC623

R

< R

LOW

HIGH

VREF

GEN.

VREF

GEN.

VREF

TEMP

TO

VOLTAGE

CONVERTER

GND

HIGH SET

LOW SET

NC

GND

HIGH SET

LOW SET

NC

VCC

HIGH LIMIT

CONTROL

LOW LIMIT

VCC

HIGH LIMIT

CONTROL

LOW LIMIT

8

7

6

5

1

2

3

4

1

8

2

7

3

6

4

5

TC623CCOA

TC623CEOA

TC623CVOA

TC623CCPA

TC623CEPA

PIN CONFIGURATION (DIP and SOIC)

NOTE: Latch Q Output, ("C" Option), is a Standard Device. Contact

Factory for Latch Q Output, ("H" Option).

TC623-5 9/18/96