MICROCHIP TC54 Technical data
M
OUT
SS
C54
3
TC54
Voltage Detector
Features
• 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
Applications
• Battery Voltage Monitoring
• Microprocessor Reset
• System Brown-out Protection
• Switching Circuit in Battery Backup
• Level Discriminator
Device Selection Table
Part Number Package Temp. Range
TC54-xxxxxxxxxxx 3-Pin SOT-23A -40°C to +85°C
TC54-xxxxxxxxxxx 3-Pin SOT-89 -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.
Package Type
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 highprecision 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
logic HIGH state as long as V
specified threshold voltage (V
below V
- the output is driven to a logic LOW. V
DET
remains LOW until VIN rises above V
amount V
, whereupon it resets to a logic HIGH.
HYST
) remains in the
OUT
is greater than the
IN
-). When VIN falls
DET
- by an
DET
OUT
Functional Block Diagram
2
V
IN
–
+
TC54VC only
V
OUT
1
3-Pin SOT-23A 3-Pin SOT-89
V
REF
T
132
V
OUT
5-Pin SOT-23A
NC
5
1
V
OUTVINVSS
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. DS21434C-page 1
TC54
2
NC
4
3
TC54
V
V
IN
SS
TC54VN has open-drain output.
TC54VC has complementary output.
V
SS
3
TC54
1.0 ELECTRICAL CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage ........................................................+12V
Output Current .................................................... 50mA
Output Voltage: CMOS..... (V
Open Drain ..........(V
Power Dissipation (T
≤ 70°C):
A
– 0.3V) to (VIN + 0.3V)
SS
– 0.3V) to 12V
SS
*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.
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
TC54 ELECTRICAL SPECIFICATIONS
Electrical Characteristics: TA = 25°C, unless otherwise specified.
Symbol Parameter Min Typ Max Units Test Conditions
V
IN
I
SS
- Threshold Voltage V
V
DET
V
HYST
I
OUT
(V
T
C
DET
Operating Voltage 0.7 — 10.0 V (V
Quiescent Current —
Hysteresis Voltage V
Output Current —
-) Tempco of (V
1.0
—
—
—
- x 0.98 — V
DET
- x 0.02 V
DET
1.3
1.6
2.0
- x 0.05 V
DET
7.7
—
—
—
—
-) — ±100 — ppm/°C -40°C ≤ T
DET
10.1
11.5
13.0
-10.0
3.0
3.4
3.8
4.2
- x 1.02 V
DET
- x 0.08 V
DET
—
—
—
—
—
µAV
mA VOL = 0.5V, VIN = 2.1V
-) = 0.8 to 6.0V
DET
= 2.1V
IN
V
= 3.0V
IN
V
= 4.0V
IN
V
= 5.0V
IN
V
= 3.0V
IN
V
= 4.0V
IN
V
= 5.0V
≤ 85°C
A
IN
TC54VC Only;
V
= VIN – 2.1V, VIN = 8.0V
OH
DS21434C-page 2 2002 Microchip Technology Inc.
2.0 PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1: PIN FUNCTION TABLE
Pin No.
(3-Pin SOT-23A)
(3-Pin SOT-89)
1V
2V
3V
Symbol Description
OUT
IN
SS
Digital output. This output goes low when VIN drops below V
rises above V
Analog input. This pin is both the power supply input and the voltage to be monitored.
Ground terminal.
DET
- + V
. (See Figure 3-1, Timing Diagram.)
HYST
TC54
- and returns high when VIN
DET
Pin No.
(5-Pin SOT-23A)
1V
2V
3V
4 NC Not connected.
5 NC Not connected.
Symbol Description
OUT
IN
SS
Digital output. This output goes low when VIN drops below V
rises above V
Analog input. This pin is both the power supply input and the voltage to be monitored.
Ground terminal.
DET
- + V
. (See Figure 3-1, Timing Diagram.)
HYST
- and returns high when VIN
DET
2002 Microchip Technology Inc. DS21434C-page 3
TC54
g
ge
ST
ge
ge
ge
OUT
3.0 DETAILED DESCRIPTION
In normal steady-state operation, when VIN > V
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
pull down (Logic 0) to V
down to within 0.5V of V
. Generally, V
SS
at rated output current and
SS
-, the output will
DET
input voltage. (See Section 1.0, Electrical
Characteristics).
FIGURE 3-1: TIMING DIAGRAM
Detect Voltage V
Minimum Operatin
Volta
Ground Level
OUT
DET
can pull
The output, V
falls below the minimum operating voltage, V
-,
0.7V. Below this minimum operating voltage, the output
is undefined. During power-up or anytime V
below V
above V
valid. V
V
IN
< V
IN
IN
OUT
DET
the input rises above V
, will stay valid until the input voltage
OUT
has fallen
, V
will remain undefined until VIN rises
OUT
MIN
, at which time the output will become
MIN
IN
will be in its active low state while V
+. (V
DET
+ = V
- + V
DET
+, the output will assume its
DET
HYST
). If and when
, of
IN
MIN
<
IN
MIN
inactive state. (High for TC54VC, open-drain for
TC54VN).
Release Volta
HY
or RESET Volta
Output Volta
Ground Level
4.0 APPLICATIONS INFORMATION
Refer to Microchip Technology Application Note #779,
Using the TC54 Voltage Detector.
DS21434C-page 4 2002 Microchip Technology Inc.
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