M
Features
• 5-Pin SOT-23A
• Factory-programmed Thresholds from
-45°C to +125°C in 10°C Increments
• Pin Selectable +2°C or +10°C Hysteresis
• ±0.5°C (Typ) Threshold Accuracy Over Full
Temperature Range
• No External Components Required
• 17 µA Supply Current (Typ)
TC6501/2/3/4
General Description
The TC6501/2/3/4 are SOT-23 temperature switches
that require no external components and are available
with factory-programmed temperature thresholds. A
choice of factory-trimmed temperature trip points are
also available. Pin-selectable hysteresis of +2°C or
+10°C allows flexibility to the design of the application.
These parts typically consume only 17 µA of current
and operate over the entire -55°C to +135°C
temperature range, while offering accuracies of ±0.5°C
(typ).
The TC6501 and TC6503 have an open-drain, active-
low output, which targets microcontroller reset control.
The TC6502 and TC6504 have a CMOS, active-high
output designed to drive the logic level MOSFET that
turns on a fan or heater element.
The TC6501/TC6502 are designed for hot temperature
monitoring (+35°C to +125°C). These devices assert a
logic signal when the temperature goes above the
threshold. The TC6503/TC6504 are optimized for cold
temperature monitoring (-45°C to +15°C) and assert a
logic signal when the temperature goes below the
threshold.
The TC6501/2/3/4 are offered with five standard tem-
perature thresholds. Available in 5-Pin SOT-23A pack-
ages, these parts are ideal for applications requiring
high integration, small size, low power and low installed
cost.
Ultra Small Temperature Switches
with Pin Selectable Hysteresis
Applications
•
•
•
•
•
•
•
Thermal Management in PCs and Servers
Over-temperature Fail-safe Circuits
Simple Fan Controller
Temperature Alarms
Projectors/Printers
Notebook Computers
Network Boxes
Package Types
T
OVER
TC6501
T
OVER
TC6502
GND 1
GND 2
TC6501
TC6502
5
Functional Block Diagram
HYST 3
4 V
CC
100 pF
GND 1
GND 2
TC6503
TC6504
5
T
UNDER
TC6503
T
UNDER
TC6504
V
CC
V
CC
+2.7V to +5.5V
TC6502
T
OVER
GND GNDHYST
PICmicro
®
Microcontroller
INT
GND
HYST 3
4 V
CC
Note:
5-Pin SOT-23A is equivalent to EIAJ SC-74A
2004 Microchip Technology Inc.
DS21451D-page 1
TC6501/2/3/4
1.0
ELECTRICAL
CHARACTERISTICS
*
Notice:
Stresses above those listed under “Maximum
Ratings” may cause permanent damage to the device.
This is a stress rating only and functional operation of
the device at these or any other conditions above those
indicated in the operational sections of the specifica-
tions is not implied. Exposure to maximum rating con-
ditions for extended periods may affect device
reliability.
Absolute Maximum Ratings*
Supply Voltage (V
CC
) .............................. -0.3V to +7V
Input Current (All Pins).......................................20 mA
Output Current (All Pins) ....................................20 mA
Operating Temperature Range.......... - 55°C to +135°C
Storage Temperature Range ............. - 65°C to +165°C
T
OVER
(TC6501)....................................... -0.3V to +7V
T
OVER
(TC6502)......................... -0.3V to (V
CC
+ 0.3V)
T
UNDER
(TC6503)....................................... -0.3V to 7V
T
UNDER
(TC6504)....................... -0.3V to (V
CC
+ 0.3V)
All Other Pins ............................. -0.3V to (V
CC
+ 0.3V)
Maximum Junction Temperature, T
J
.................. 150°C
Power Dissipation (T
A
= +70°C):
(Derate 7.1 mW/°C Above +70°C) ...............570 mW
ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
Unless otherwise noted, V
CC
= +2.7V to +5.5V, R
PULL-UP
= 100 kΩ (TC6501/TC6503 only), 100 pF
decoupling capacitor from V
CC
to GND, T
AMB
= -55°C to +135°C. Typical values are at T
A
= +25°C.
Parameter
Supply Voltage Range
Supply Current
HYST Input Threshold
HYST Input Threshold
Temperature Threshold Accuracy
(Note 1)
Symbol
V
CC
I
CC
V
IH
V
IL
∆T
TH
Min
2.7
—
0.8 x V
CC
—
-6
-4
-4
-6
Temperature Threshold Hysteresis
Output Voltage High
T
HYST
V
OH
—
—
0.8 x V
CC
V
CC
- 1.5
Output Voltage Low
Open-Drain Output Leakage Current
V
OL
—
—
—
Typ
—
17
—
—
±0.5
±0.5
±0.5
±0.5
2.0
10
—
—
—
—
10
Max
5.5
40
—
0.2 x V
CC
6
4
4
6
—
—
—
—
0.3
0.4
—
Unit
V
µA
V
V
°C
°C
°C
°C
°C
°C
V
V
V
V
nA
-45°C to -25°C
-15°C to +15°C
+35°C to +65°C
+75°C to +125°C
HYST = GND
HYST = V
CC
I
SOURCE
= 500 µA, V
CC
> 2.7V
(TC6502/TC6504 Only)
I
SOURCE
= 800 µA, V
CC
> 4.5V
(TC6502/TC6504 Only)
I
SINK
= 1.2 mA, V
CC
> 2.7V
I
SINK
= 3.2 mA, V
CC
> 4.5V
V
CC
= 2.7V, T
UNDER
= 5.5V
(TC6503); T
OVER
= 5.5V
(TC6501)
Test Conditions
Note 1:
The
TC6501/2/3/4
are available with internal, factory-programmed temperature trip thresholds from -45°C to +125°C, in
+10°C increments.
DS21451D-page 2
2004 Microchip Technology Inc.
TC6501/2/3/4
2.0
Note:
TYPICAL PERFORMANCE CURVES
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
Unless otherwise noted, V
CC
= 5.0V, R
PULL-UP
= 100 kΩ (TC6501/TC6503 only), 100 pF decoupling
capacitor from V
CC
to GND, T
AMB
= +25°C.
60
40
Note:
.
50
35
Frequency
40
30
20
10
0
Supply Current (µA)
30
25
20
15
10
5
-5 -4 -3 -2 -1 0 1 2
Accuracy (˚C)
3 4 5
0
-60 -40 -20 0 20 40 60 80 100 120 140
Temperature (˚C)
FIGURE 2-1:
80
70
Output Resistance (Ω)
Trip Threshold Accuracy.
FIGURE 2-4:
Temperature.
12
10
Hysteresis (˚C)
Supply Current vs.
V
CC
= 4.0V
V
CC
= 2.7V
60
50
40
30
20
10
0
V
CC
= 5.0V
HYST = V
CC
TC6503/04
TC6501/02
8
6
4
HYS = GND
2
TC6503/04
TC6501/02
0 10 20 30 40 50 60 70 80 90 100
Temperature (˚C)
FIGURE 2-2:
Temperature.
Output Sink Resistance vs.
0
-45 -25 -5 15 35 55 75 95 115
Trip Temperature (˚C)
FIGURE 2-5:
Temperature.
Hysteresis vs. Trip
+100˚C
+100˚C
+15˚C/div
+12.5 C/div
Mounted On 0.75 in2
of 2 oz. Copper
+25˚C
Mounted On 0.75 in2
of 2 oz. Copper
+25˚C
5sec/div
20sec/div
FIGURE 2-3:
Thermal Step Response in
Perfluorinated Fluid (SOT-23).
2004 Microchip Technology Inc.
FIGURE 2-6:
Still Air (SOT-23).
Thermal Step Response in
DS21451D-page 3
TC6501/2/3/4
Note:
Unless otherwise noted, V
CC
= 5.0V, R
PULL-UP
= 100 kΩ (TC6501/TC6503 only), 100 pF decoupling
capacitor from V
CC
to GND, T
AMB
= +25°C.
180
Output Source Resistance (Ω)
160
140
120
100
80
60
180
40
20
0
VCC = 2.7V
VCC = 4.0V
VCC = 5.0V
20 40
60 80 100 120 140
Temperature (˚C)
FIGURE 2-7:
Output Source Resistance
vs. Temperature (TC6502).
DS21451D-page 4
2004 Microchip Technology Inc.
TC6501/2/3/4
3.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
TC6501
1, 2
3
4
5
—
—
—
1, 2
3
4
—
5
—
—
PIN FUNCTION TABLE
TC6503
1, 2
3
4
—
—
5
—
TC6504
1, 2
3
4
—
—
—
5
Symbol
GND
HYST
V
CC
T
OVER
T
OVER
T
UNDER
T
UNDER
Ground
Hysteresis Input
Supply Input (+2.7V to +5.5V)
Open-Drain, Active-Low Output
Push/Pull Active-High Output
Open-Drain, Active-Low Output
Push/Pull Active-High Output
Description
TC6502
3.1
Ground
3.5
Connect the device ground pins directly to the PCB
ground and minimize the length of the connection. The
thermal resistance to the die is at a minimum at Pin 2.
Push/Pull Active-High Output
(TC6502) (T
OVER
)
3.2
Hysteresis Input (HYST)
The voltage at T
OVER
is equal to a logic-high level if the
sensor detects a temperature greater than the factory-
programmed threshold temperature.
Either 2°C (GND) or 10°C (V
CC
) of hysteresis is
selected by connecting HYST to GND or V
CC
.
3.6
Open-Drain, Active-Low Output
(TC6503) (T
UNDER
)
3.3
Supply Input (V
CC
)
A 100 pF or greater decoupling capacitor from V
CC
to
GND is recommended.
3.4
Open-Drain, Active-Low Output
(TC6501) (T
OVER
)
The voltage at the T
UNDER
pin is equal to a logic-low
level if the sensor detects a temperature that is less
than the factory-programmed threshold temperature.
Because this is an open-drain output, an external pull-
up resistor is required (a 100 kΩ pull-up resistor is
recommended). The voltage on this pin can be higher
than V
CC
, though the voltage must not exceed the
absolute maximum input voltage of 7.0V
The voltage at the T
OVER
pin is equal to a logic-low
level if the sensor detects a temperature that is greater
than the factory-programmed threshold temperature.
Because this is an open-drain output, an external pull-
up resistor is required (a 100 kΩ pull-up resistor is
recommended). The voltage on this pin can be higher
than V
CC
, though the voltage must not exceed the
absolute maximum input voltage of 7.0V.
3.7
Push/Pull Active-High Output
(TC6504) (T
UNDER
)
The voltage at T
UNDER
is equal to a logic-high level if
the sensor detects a temperature less than the factory-
programmed threshold temperature.
2004 Microchip Technology Inc.
DS21451D-page 5
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