TC54
Voltage Detector
Features
• ±2.0% Detection Thresholds
• Small Packages: 3-Pin SOT-23A, SOT-89, and
TO-92
• Low Current Drain: 1 µA, typical
• Wide Detection Range: 1.1V to 6.0V
• Wide Operating Voltage Range: 0.7V to 10V
General Description
The TC54 series are CMOS voltage detectors that are
especially well suited for battery-powered applications
because of their extremely low 1 µA operating current
and small surface-mount packaging. Each part is laser-
trimmed to the desired threshold voltage, which can be
specified from 1.4V to 6.0V with a 2% tolerance.
The TC54 is available with either an open-drain or com-
plementary output stage. During operation, the output
(V
OUT
) remains in the logic-high state as long as V
IN
is
greater than the specified threshold voltage (V
DET
–).
When V
IN
falls below V
DET
–, the output is driven to a
logic-low. V
OUT
remains low until V
IN
rises above
V
DET
– by an amount V
HYST
, when it resets to a logic-
high state.
Applications
•
•
•
•
•
Battery Voltage Monitoring
Microprocessor Reset
System Brown-Out Protection
Switching Circuit in Battery Backup
Level Discriminator
Package Types
3-Pin SOT-23A
V
IN
3
3-Pin SOT-89
V
IN
Functional Block Diagram
TC54VC
only
V
IN
V
OUT
1
V
OUT
TC54
TC54
–
+
2
V
SS
2
3
V
OUT
V
IN
V
SS
3-Pin TO-92
1
V
REF
V
SS
123
TC54VN
has open-drain output.
TC54VC
has complementary (push-pull) output.
V
OUT
V
IN
V
SS
Note:
3-Pin SOT-23A is equivalent to the
EIAJ SC-59.
Device Features
Output
Device
Type
TC54VN
TC54VC
Note 1:
Open-Drain
Push-Pull
State
Active Low
Active Low
No
No
1.4V, 2.1V, 2.7V, 2.9V
3.0V, 4.2V, 4.3V
Reset Delay
Std. Trip Points
(1)
(typical)
Custom Trip Points available. Minimum order requirement. Information available upon request.
2001-2011 Microchip Technology Inc.
DS21434J-page 1
TC54
1.0
ELECTRICAL
CHARACTERISTICS
† Notice:
Stresses above those listed under "Absolute Maxi-
mum Ratings" may cause permanent damage to the device.
These are stress ratings only and functional operation of the
device at these or any other conditions above those indicated
in the operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
Absolute Maximum Ratings †
Input Voltage ...................................................................+12V
Output Current ..............................................................50 mA
Output Voltage: CMOS................(V
SS
– 0.3V) to (V
IN
+ 0.3V)
Open-Drain.....................(V
SS
– 0.3V) to 12V
Power Dissipation (T
A
70°C):
3-Pin SOT-23A .......................................................240 mW
3-Pin SOT-89..........................................................500 mW
3-Pin TO-92 ............................................................300 mW
Operating Temperature Range........................-40°C to +85°C
Storage Temperature Range .........................-65°C to +150°C
DC CHARACTERISTICS
Electrical Specifications:
Unless otherwise noted, T
A
= +25°C.
Parameter
Operating Voltage
Quiescent Current
Sym
V
IN
I
SS
Min
0.7
0.7
—
—
—
—
Threshold Voltage
(Note
1)
V
DET
–
1.37
2.06
2.65
2.84
2.94
4.12
4.21
Hysteresis Voltage
V
HYST
28
42
54
58
60
84
86
Output Current
I
OUT
3.0
5.0
6.0
7.0
—
Tempco of (V
DET
–)
Delay Time
Note 1:
T
C
(V
DET
–)
t
DLY
—
—
Typ
—
—
0.8
0.9
1.0
1.1
1.4
2.1
2.7
2.9
3.0
4.2
4.3
70
105
135
145
150
210
215
7.7
10.1
11.5
13.0
-10.0
±100
—
Max
10.0
6.0
2.7
3.0
3.2
3.6
1.43
2.14
2.75
2.96
3.06
4.28
4.39
112
168
216
232
240
336
344
—
—
—
—
-2.0
—
0.2
mA
mV
V
Units
V
V
µA
Test Conditions
(V
DET
–)
1.6V
(V
DET
–) < 1.6V
V
IN
= 2.0V
V
IN
= 3.0V
V
IN
= 4.0V
V
IN
= 5.0V
TC54VX14
TC54VX21
TC54VX27
TC54VX29
TC54VX30
TC54VX42
TC54VX43
V
DET
= 1.4V (typical)
V
DET
= 2.1V (typical)
V
DET
= 2.7V (typical)
V
DET
= 2.9V (typical)
V
DET
= 3.0V (typical)
V
DET
= 4.2V (typical)
V
DET
= 4.3V (typical)
V
OL
= 0.5V, V
IN
= 2.0V
V
OL
= 0.5V, V
IN
= 3.0V
V
OL
= 0.5V, V
IN
= 4.0V
V
OL
= 0.5V, V
IN
= 5.0V
TC54VC Only:
V
OH
= V
IN
– 2.1V, V
IN
= 8.0V
ppm/°C -40°C
T
A
85°C
ms
V
DET
–
V
OUT
inversion
For other voltage options, please contact your regional Microchip sales office.
DS21434J-page 2
2001-2011 Microchip Technology Inc.
TC54
TEMPERATURE SPECIFICATIONS
Electrical Characteristics:
Unless otherwise indicated, all limits are specified for: V
DD
=+1.8V to +5.5V, V
SS
=GND.
Parameters
Temperature Ranges
Operating Temperature Range
Storage Temperature Range
Thermal Package Resistances
Thermal Resistance, 3L-SOT-23A
Thermal Resistance, 3L-SOT-89
Thermal Resistance, 3L-TO-92
JA
JA
JA
—
—
—
308
131.7
146
—
—
—
°C/W
°C/W
°C/W
T
A
T
A
-40
-65
—
—
+85
+150
°C
°C
Sym
Min
Typ
Max
Units
Conditions
V
DET –
+V
HYST
V
DET
V
DD
t
DLY
V
OH
OUTPUT
FIGURE 1-1:
Timing Diagram.
2001-2011 Microchip Technology Inc.
DS21434J-page 3
TC54
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in
Table 2-1.
TABLE 2-1:
PIN FUNCTION TABLE
TC54
Symbol
Description
Digital Output
Analog Input
Ground Terminal
Analog Input
SOT-23A
1
3
2
—
SOT-89
1
2
3
Tab
TO-92
1
2
3
—
V
OUT
V
IN
V
SS
V
IN
2.1
Digital Output (V
OUT
)
2.3
Ground Terminal (V
SS
)
V
OUT
goes low when V
IN
drops below V
DET
– and
returns high when V
IN
rises above V
DET
– + V
HYST
.
(See
Figure 3-1).
V
SS
provides the negative reference for the analog
input voltage. Typically, the circuit ground is used.
2.2
Analog Input (V
IN
)
V
IN
can be used for power supply monitoring or a
voltage level that requires monitoring.
DS21434J-page 4
2001-2011 Microchip Technology Inc.
TC54
3.0
DETAILED DESCRIPTION
In normal steady-state operation when V
IN
> V
DET
–,
the output will be at a logic-high (see
Figure 3-1).
In the
case of the TC54VN, this is an open-drain condition. If
the input falls below V
DET
–, the output will pull down
(Logic
0)
to V
SS
. Generally, V
OUT
can pull down to
within 0.5V of V
SS
at rated output current and input
voltage.
(See
Section 1.0
“Electrical
Characteristics”).
The output (V
OUT
) will stay valid until the input voltage
falls below the minimum operating voltage (V
INMIN
) of
0.7V. Below this minimum operating voltage, the output
is undefined. During power-up (or anytime V
IN
has
fallen below V
INMIN
), V
OUT
will remain undefined until
V
IN
rises above V
INMIN
. When this occurs, the output
will become valid. V
OUT
will be in its Active-low state,
while V
INMIN
< V
IN
< V
DET
+ (therefore, V
DET
+ = V
DET
–
+ V
HYST
). If the input rises above V
DET
+, the output will
assume its Inactive state (high for TC54VC, open-drain
for TC54VN).
V
IN
V
DET
+
V
HYST
Release Voltage
or RESET Voltage
Detect Voltage V
DET
–
Minimum Operating
Voltage
Ground Level
V
OUT
Output Voltage
Ground Level
FIGURE 3-1:
Timing Diagram.
2001-2011 Microchip Technology Inc.
DS21434J-page 5
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