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TC623
3V, DUAL TRIP POINT TEMPERATURE SENSOR
FEATURES
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Integrated Temp Sensor and Detector Operate
from a Supply Voltage as Low as 2.7V
Replaces Mechanical Thermostats and Switches
On-Chip Temperature Sense
8-Pin DIP or SOIC for Direct PCB Mounting
2 User-Programmable Temperature Set Points
2 Independent Temperature Limit Outputs
Heat/Cool Regulate Output
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.
2
3
4
5
6
VCC
LOW LIMIT
HIGH LIMIT
CONTROL
APPLICATIONS
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CPU Thermal Management
System Over-or Under-Temperature Shutdown
Advanced Thermal Warning
Fan Speed Control Circuits
Accurate Appliance Temperature Sensing
Environmental Control
ORDERING INFORMATION
Part No.
Package
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
8-Pin Plastic DIP
8-Pin SOIC
Temperature
Range
0°C to +70°C
0°C to +70°C
– 40°C to +85°C
– 40°C to +85°C
– 40°C to +125°C
FUNCTIONAL BLOCK DIAGRAM
TC623CCOA
TC623CCPA
TC623CEOA
TC623CEPA
TC623CVOA
NC
1
8
TEMP
TO
VOLTAGE
CONVERTER
VCC
NOTE:
Latch Q Output, ("C" Option), is a Standard Device. Contact
Factory for Latch Q Output, ("H" Option).
TC623
+
LOW SET
2
VREF
GEN.
PIN CONFIGURATION
(DIP and SOIC)
7
LOW LIMIT
–
NC
LOW SET
1
2
3
4
TC623CCOA
TC623CEOA
TC623CVOA
8
7
6
5
VREF
HIGH SET
+
GND
6
HIGH LIMIT
HIGH SET
3
VREF
GEN.
–
7
NC
LOW SET
1
2
3
4
TC623CCPA
TC623CEPA
8
7
6
5
VCC
LOW LIMIT
HIGH LIMIT
CONTROL
HIGH SET
GND
R
GND
4
S
5
Q
CONTROL
LATCH
RLOW < RHIGH
8
2-25
TC623-5 9/18/96
TELCOM SEMICONDUCTOR, INC.
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
