TC54 Datasheet, PDF (1/12 Pages) TelCom Semiconductor, Inc – VOLTAGE DETECTOR

M
Voltage Detector
TC54
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
3-Pin SOT-23A
V_IN
2
3-Pin SOT-89
TC54
1
3
V_OUT
V_SS
TC54
1
2
3
V_OUT V_IN V_SS
5-Pin SOT-23A
NC
NC
5
4
TC54
1
2
3
V_OUT V_IN 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.
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.
Functional Block Diagram
2
TC54VC only
V_IN
–
V_OUT
1
+
V_REF
V_SS
3
TC54VN has open-drain output.
TC54VC has complementary output.
 2002 Microchip Technology Inc.
DS21434C-page 1