TelCom TC54 Technical data

VOL TAGE DETECTOR

FEATURES

1

TC54

2

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

APPLICATIONS

■ Battery Voltage Monitoring

■ Microprocessor Reset

■ System Brownout Protection

■ Switching Circuit in Battery Backup

■ Level Discriminator

PIN CONFIGURATIONS

*SOT-23A-3 SOT-89-3

V

IN

TC54

V

OUT

*SOT-23A-3 is equivalent to EIAJ (SC-59)

FUNCTIONAL BLOCK DIAGRAM

V

SS

132

V

OUT

TC54

V

V

IN

SS

OUT

V

TO-92

IN

SS

V

V

112332

TC54

The TC54 Series are CMOS voltage detectors, suited
especially for battery-powered applications because of their
extremely low 1µA operating current and small surface­mount 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 high­precision reference, laser-trimmed divider, hysteresis circuit
and output driver. The TC54 is available with either an open­drain or complementary output stage.

In operation, the TC54's output (V
logic HIGH state as long as VIN is greater than the
specified threshold voltage (V

–

V

, the output is driven to a logic LOW. V

DET

LOW until VIN rises above V
whereupon it resets to a logic HIGH.

–

). When VIN falls below

DET
–

by an amount V

DET

) remains in the

OUT

OUT

remains

HYST

ORDERING INFORMATION
PART CODE TC54 V X XX X X X XX XXX

Output form:

N = Nch Open Drain

C = CMOS Output

Detected Voltage:

Ex: 21 = 2.1V; 60 = 6.0V

Extra Feature Code: Fixed: 0
Tolerance:

1 = ± 1.0% (custom)

2 = ± 2.0% (standard)

3

4

,

5

6

2

V

IN

–
+

V

REF

TC54VN has open-drain output.
TC54VC has complementary output.

TELCOM SEMICONDUCTOR, INC.

TC54VC only

V

OUT

1

V

SS

3

Temperature: E: – 40°C to + 85°C
Package Type and Pin Count:

CB: SOT-23A-3*, MB: SOT-89-3, ZB: TO-92-3

Taping Direction:

Standard Taping

Reverse Taping

No suffix: TO-92 Bulk

*SOT-23A-3 is equivalent to EIAJ (SC-59).

7

8

TC54-10 11/8/96

4-279

TC54

VOLT AGE DETECTOR

ABSOLUTE MAXIMUM RATINGS*

Supply Voltage (V

Output Voltage: CMOS ............ (VSS – 0.3) to (VIN + 0.3)

Output Current .........................................................50mA

Power Dissipation: (TA ≤ 70°C)

..................................................................... 12V

IN)

Open Drain................. (VSS – 0.3) to 12V

* Static-sensitive device. Unused devices must be stored in conductive
material. Protect devices from static discharge and static fields. 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 operational sections of the specifications is not implied.
Exposure to Absolute Maximum Rating Conditions for extended periods
may affect device reliability.

SOT-23A-3 .....................................................240mW

SOT-89-3 .......................................................400mW

TO-92 .......................................................440mW

Operating Temperature..........................– 40°C to + 85°C

Storage Temperature ........................... – 65°C to + 150°C

Soldering Temperature ...................... 300°C, 10 seconds

ELECTRICAL CHARACTERISTICS: T

= 25°C, unless otherwise specified.

A

Symbol Parameter Test Conditions Min Typ Max Unit

V
I

SS

V

V

I

OUT

IN

–
DET

HYST

Operating Voltage V
Quiescent Current VIN = 2.1V 1.0 3.0

Threshold Voltage (V

Hysteresis Range (V

Output Current Nch VDS = 0.5 VIN = 2.1V 7.7 mA

–

= 2.1 to 6.0V 1.5 10.0 V

DET

3.0V 1.3 3.4 µA

4.0V 1.6 3.8

5.0V 2.0 4.2

–

)(V

DET

–
DET

x 0.98 x 1.02

–

)(V

DET

–

)(V

DET

–
DET

x 0.02 x 0.05 x 0.08

3.0V 10.1

4.0V 11.5

5.0V 13.0

)V

)V

Pch VDS = 2.1V VIN = 8.0V – 10.0

TC (V

–

) Tempco of (V

DET

–

) – 40°C ≤ TA ≤ 85°C ± 100 ppm/°C

DET

PIN DESCRIPTION

Pin No. Symbol Description

1VINAnalog input. This pin is both the power supply input and the voltage to be monitored.
2V

OUT

Digital output. This output goes low when VIN drops below V
high when VIN rises above V

–
DET

+ V

. (See timing chart).

HYST

3VSSGround terminal.

4-280

TELCOM SEMICONDUCTOR, INC.

–

and returns

DET