TC7129

DS21459D-page 4

© 2006 Microchip Technology Inc.

Power

Common Voltage

2.8

3.2

3.5

V

V+ to pin 28

Common Sink Current

—

0.6

—

mA

ΔCommon = +0.1V

Common Source Current

—

10

—

μA

ΔCommon = -0.1V

DGND

Digital Ground Voltage

4.5

5.3

5.8

V

V+ to pin 36, V+ to V– = 9V

Sink Current

—

1.2

—

mA

ΔDGND = +0.5V

Supply Voltage Range

6

9

12

V

V+ to V–

Supply Current Excluding

Common Current

—

0.8

1.3

mA

V+ to V– = 9V

Clock Frequency

—

120

360

kHz

—

50

—

k

Ω

Low Battery Flag Activation

Voltage

6.3

7.2

7.7

V

V+ to V–

Digital

Continuity Comparator Threshold

Voltages

100

200

—

mV

—

200

400

mV

Pull-down Current

—

2

10

μA

Pins 37, 38, 39

“Weak Output” Current

Sink/Source

—

3/3

—

μA

Pins 20, 21 sink/source

—

3/9

—

μA

Pin 27 sink/source

Pin 22 Source Current

—

40

—

μA

Pin 22 Sink Current

—

3

—

μA

TC7129 ELECTRICAL SPECIFICATIONS (CONTINUED)

Pin numbers refer to 40-pin DIP.

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Note 1:

Input voltages may exceed supply voltages, provided input current is limited to ±400

μA. Currents above

this value may result in invalid display readings, but will not destroy the device if limited to ±1 mA.

Dissipation ratings assume device is mounted with all leads soldered to printed circuit board.