M
Features
Applications
•
•
•
•
•
Battery Voltage Monitoring
Microprocessor Reset
System Brown-out Protection
Switching Circuit in Battery Backup
Level Discriminator
TC54
Voltage Detector
General Description
The TC54 Series are CMOS voltage detectors, suited
especially for battery-powered applications because of
their extremely low 1µA operating current and small
surface-mount packaging. Each part is laser trimmed to
the desired threshold voltage which can be specified
from 1.1V to 6.0V and 7.7V, for a 2% and 1.5V to 6.0V
for a 1% tolerance.
The device includes a comparator, low-current high-
precision reference, laser-trimmed divider, hysteresis
circuit and output driver. The TC54 is available with
either an open-drain or complementary output stage.
In operation, the TC54's 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
, whereupon it resets to a logic HIGH.
Temp. Range
-40°C to +85°C
• Precise Detection Thresholds: Standard ±2.0%,
Custom ±1.0%
• Small Packages: 3-Pin SOT-23A, 3-Pin SOT-89,
5-Pin SOT-23A (7.7V only)
• Low Current Drain: Typ. 1µA
• Wide Detection Range: 1.1V to 6.0V and 7.7V
• Wide Operating Voltage Range: 0.7V to 10V
Device Selection Table
Part Number
TC54-xxxxxxxxxxx
Package
3-Pin SOT-89
Functional Block Diagram
2
V
IN
TC54VC only
TC54-xxxxxxxxxxx 3-Pin SOT-23A -40°C to +85°C
TC54-xxxxxxxxxxx 5-Pin SOT-23A -40°C to +85°C
Other output voltages are available. Please contact Microchip
Technology Inc. for details.
–
+
V
OUT
1
Package Type
3-Pin SOT-23A
V
IN
2
3-Pin SOT-89
V
REF
V
SS
3
TC54
1
V
OUT
3
V
SS
1
V
OUT
2
V
IN
TC54
3
V
SS
TC54VN has open-drain output.
TC54VC has complementary output.
5-Pin SOT-23A
NC
5
NC
4
TC54
1
V
OUT
2
V
IN
3
V
SS
NOTE:
3-Pin SOT-23A is equivalent to the EIAJ SC-59.
5-Pin SOT-23A is equivalent to the EIAJ SC-74A.
2002 Microchip Technology Inc.
DS21434B-page 1
TC54
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage ........................................................+12V
Output Current ....................................................50mA
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 ...........................................240mW
3-Pin SOT-89 .............................................400mW
5-Pin SOT-23A ...........................................240mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-65°C to +150°C
*Stresses above those listed under "Absolute Maximum
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.
TC54 ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
T
A
= 25°C, unless otherwise specified.
Symbol
V
IN
I
SS
Parameter
Operating Voltage
Quiescent Current
Min
0.7
—
—
—
—
V
DET
- x 0.98
V
DET
- x 0.02
—
—
—
—
—
T
C
(V
DET
-)
Tempco of (V
DET
-)
—
Typ
—
1.0
1.3
1.6
2.0
—
V
DET
- x 0.05
7.7
10.1
11.5
13.0
-10.0
±100
Max
10.0
3.0
3.4
3.8
4.2
V
DET
- x 1.02
V
DET
- x 0.08
—
—
—
—
—
—
Units
V
µ
A
Test Conditions
(V
DET
-) = 0.8 to 6.0V
V
IN
= 2.1V
V
IN
= 3.0V
V
IN
= 4.0V
V
IN
= 5.0V
V
DET
-
V
HYST
I
OUT
Threshold Voltage
Hysteresis Voltage
Output Current
V
V
mA
V
OL
= 0.5V, V
IN
= 2.1V
V
IN
= 3.0V
V
IN
= 4.0V
V
IN
= 5.0V
TC54VC Only;
V
OH
= V
IN
– 2.1V, V
IN
= 8.0V
ppm/°C -40°C
≤
T
A
≤
85°C
DS21434B-page 2
2002 Microchip Technology Inc.
TC54
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No.
(3-Pin SOT-23A)
(3-Pin SOT-89)
1
2
3
PIN FUNCTION TABLE
Symbol
V
OUT
V
IN
V
SS
Description
Digital output. This output 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, Timing Diagram.)
Analog input. This pin is both the power supply input and the voltage to be monitored.
Ground terminal.
Pin No.
(5-Pin SOT-23A)
1
2
3
4
5
Symbol
V
OUT
V
IN
V
SS
NC
NC
Description
Digital output. This output 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, Timing Diagram.)
Analog input. This pin is both the power supply input and the voltage to be monitored.
Ground terminal.
Not connected.
Not connected.
2002 Microchip Technology Inc.
DS21434B-page 3
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 TC54V, this is an open-drain condition. If
and when 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
IN
MIN
, of
0.7V. Below this minimum operating voltage, the output
is undefined. During power-up or anytime V
IN
has fallen
below V
IN
MIN
, V
OUT
will remain undefined until V
IN
rises
above V
IN
MIN
, at which time the output will become
valid. V
OUT
will be in its active low state while V
IN
MIN
<
V
IN
< V
DET
+. (V
DET
+ = V
DET
- + V
HYST
). If and when
the input rises above V
DET
+, the output will assume its
inactive state. (High for TC54VC, open-drain for
TC54VN).
FIGURE 3-1:
TIMING DIAGRAM
V
IN
V
DET
+
V
HYST
Detect Voltage V
DET
-
Minimum Operating
Voltage
Ground Level
Release Voltage
or RESET Voltage
V
OUT
Output Voltage
Ground Level
4.0
APPLICATIONS INFORMATION
Refer to Microchip Technology Application Note #779,
Using the TC54 Voltage Detector.
DS21434B-page 4
2002 Microchip Technology Inc.
TC54
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
3
1
represents output configuration (CMOS or Nch)
and first integer of voltage
Ex: CMOS 3.x =
Symbol
B
C
D
E
F
H
Symbol
L
M
N
P
R
S
T
D
1
represents output configuration and first integer
of voltage
Symbol
Output
Nch
Voltage
7.
Output
CMOS
CMOS
CMOS
CMOS
CMOS
CMOS
Output
Nch
Nch
Nch
Nch
Nch
Nch
Nch
Voltage
1.
2.
3.
4.
5.
6.
Voltage
1.
2.
3.
4.
5.
6.
7.
2
T
represents first decimal of output voltage
Symbol
0
1
2
3
4
5
6
7
8
9
Voltage
.0
.1
.2
.3
.4
.5
.6
.7
.8
.9
3
&
4
represents assembly lot code
2
represents first decimal of output voltage (0-9)
Ex: CMOS 3.x =
D 4
3
&
4
represents assembly lot code
2002 Microchip Technology Inc.
DS21434B-page 5
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