ON Semiconductor MC623 Technical data
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MC623
3.0 V, Dual Trip Point
Temperature Sensor
The MC623 is a 3.0 V solid-state, programmable temperature
sensor designed for use in thermal management applications. 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 exceeds the user-programmed limits. The
CONTROL output is driven active (high) when temperature exceeds
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 MC623 an ideal choice for many thermal
management applications.
Features
• Integrated Temperature Sensor and Detector Operate from a Supply
Voltage as Low as 2.7 V
• Replaces Mechanical Thermostats and Switches
• On-Chip Temperature Sense
• 8-Pin SOIC for Direct PCB Mounting
• 2 User-Programmable Temperature Set Points
• 2 Independent Temperature Limit Outputs
• Heat/Cool Regulate Output
• Operating Temperature Range: -40°C to +85°C
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SO-8
D SUFFIX
PRELIMINARY INFORMATION
LOW SET
HIGH SET
CASE TBD
PIN CONFIGURATION
NC
GND
1
2
MC623D
3
4
(Top View)
8
7
6
5
V
CC
LOW LIMIT
HIGH LIMIT
CONTROL
T ypical Applications
• CPU Thermal Management
• System Over-or Under-Temperature Shutdown
• Advanced Thermal Warning
• Fan Speed Control Circuits
• Accurate Appliance Temperature Sensing
• Environmental Control
ORDERING INFORMATION
Device Package Shipping
MC623DR2 8-Pin SOIC 2500 Tape/Reel
Semiconductor Components Industries, LLC, 2003
February, 2003 - Rev. 3
1 Publication Order Number:
MC623/D
FUNCTIONAL BLOCK DIAGRAM
MC623
NC
LOW
SET
HIGH
SET
1
2
3
Voltage
Converter
V
Gen.
ref
V
ref
V
Gen.
ref
+
−
+
−
MC623
V
CC
8
LOW
7
LIMIT
HIGH
6
LIMIT
RS
Temp to
GND
Q
4
R
LOW
< R
HIGH
Latch
5
CONTROL
MAXIMUM RATINGS*
Rating Value Unit
Package Power Dissipation (TA ≤ 70°C) 470 mW
Derating Factors 6.0 mW/°C
Supply Voltage 5.5 V
Input Voltage, Any Input (GND - 0.3) to (VDD + 0.3) V
Operating Temperature Range -40 to +125 °C
Maximum Chip Temperature 150 °C
Storage Temperature Range -65 to +150 °C
Lead Temperature (Soldering, 10 Seconds) +300 °C
* Maximum Ratings are those values beyond which damage to the device may occur.
ELECTRICAL CHARACTERISTICS (Over Operating Temperature Range, V
Characteristic Symbol Min Typ
Supply Voltage Range V
Supply Current (2.7V ≤ VDD ≤ 4.5V) I
= 2.7V to 4.5V, unless otherwise noted.)
DD
DD
DD
2.7 - 4.5 V
- 150 250 µA
1
Max Unit
Absolute Accuracy
T = Programmed Temperature
IOH = 250µA
= 500µA
I
OH
IOL = 500µA
I
= 1.0mA
OL
V
OH
V
OL
T-3 T±1 T+3
0.9 x V
0.8 x V
-
-
DD
DD
-
-
-
-
-
-
0.1 x V
0.2 x V
DD
DD
Hysteresis (Falling Temperature) HYST - - -2.0 °C
1. Measured at 25°C.
°C
V
V
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