TC54
Voltage Detector
Features
General Description
• ±2.0% Detection Thresholds
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.
• 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
The TC54 is available with either an open-drain or com-
plementary output stage. During operation, the output
(VOUT) remains in the logic-high state as long as VIN is
Applications
–
greater than the specified threshold voltage (VDET ).
• Battery Voltage Monitoring
• Microprocessor Reset
–
When VIN falls below VDET , the output is driven to a
logic-low. VOUT remains low until VIN rises above
VDET by an amount VHYST, when it resets to a logic-
• System Brown-Out Protection
• Switching Circuit in Battery Backup
• Level Discriminator
–
high state.
Package Types
Functional Block Diagram
3-Pin SOT-23A
3-Pin SOT-89
VIN
VIN
TC54VC only
3
VIN
TC54
TC54
VOUT
1
2
1
2
3
–
VOUT
VSS
VOUT VIN
VSS
+
3-Pin TO-92
1 2 3
VREF
VSS
TC54VN has open-drain output.
TC54VC has complementary (push-pull) output.
VOUT VIN VSS
Note:
3-Pin SOT-23A is equivalent to the
EIAJ SC-59.
Device Features
Output
Device
Reset Delay
Std. Trip Points(1) (typical)
Type
State
TC54VN
TC54VC
Open-Drain
Push-Pull
Active Low
Active Low
No
No
1.4V, 2.1V, 2.7V, 2.9V
3.0V, 4.2V, 4.3V
Note 1: Custom Trip Points available. Minimum order requirement. Information available upon request.
2001-2011 Microchip Technology Inc.
DS21434J-page 1