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TC54
VOLTAGE DETECTOR
FEATURES
GENERAL DESCRIPTION
■ Precise Detection Thresholds .... Standard ± 2.0%
Custom ± 1.0%
■ Small Packages ........... SOT-23A-3, SOT-89, TO-92
■ Low Current Drain ..................................... Typ. 1µA
■ Wide Detection Range..........................2.1V to 6.0V
■ Wide Operating Voltage Range ............ 1.5V to 10V
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 2.1V to 6.0V,
in 0.1V steps.
The device includes a comparator, low-current high-
precisionreference,laser-trimmeddivider,hysteresiscircuit
andoutputdriver. TheTC54isavailablewitheitheranopen-
drain or complementary output stage.
APPLICATIONS
■ Battery Voltage Monitoring
■ Microprocessor Reset
■ System Brownout Protection
■ Switching Circuit in Battery Backup
■ Level Discriminator
In operation, the TC54's output (VOUT) remains in the
logic HIGH state as long as VIN is greater than the
specified threshold voltage (VD–ET). When VIN falls below
V–DET, the output is driven to a logic LOW. VOUT remains
LOW until VIN rises above V–DET by an amount VHYST
whereupon it resets to a logic HIGH.
,
PIN CONFIGURATIONS
*SOT-23A-3
SOT-89-3
TO-92
V
IN
ORDERING INFORMATION
2
1 2 3
PART CODE TC54 V X XX X X X XX XXX
TC54
Output form:
TC54
N = Nch Open Drain
C = CMOS Output
TC54
3
1
1
2
3
V
V
SS
V
V
V
SS
OUT
OUT
IN
Detected Voltage:
Ex: 21 = 2.1V; 60 = 6.0V
Extra Feature Code: Fixed: 0
*SOT-23A-3 is equivalent to EIAJ (SC-59)
Tolerance:
1 = ± 1.0% (custom)
2 = ± 2.0% (standard)
FUNCTIONAL BLOCK DIAGRAM
Temperature: E: – 40°C to + 85°C
2
TC54VC only
Package Type and Pin Count:
V
IN
CB: SOT-23A-3*, MB: SOT-89-3, ZB: TO-92-3
Taping Direction:
Standard Taping
Reverse Taping
V
OUT
–
+
1
No suffix: TO-92 Bulk
*SOT-23A-3 is equivalent to EIAJ (SC-59).
V
REF
V
SS
3
TC54VN has open-drain output.
TC54VC has complementary output.
TC54-10 11/8/96
TELCOM SEMICONDUCTOR, INC.
4-279