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TC7129CPL

4-1/2 Digit Analog-to-Digital Converters with On-Chip LCD Drivers

Microchip Technology 

TC7129

TC7129 ELECTRICAL SPECIFICATIONS (CONTINUED)

Electrical Characteristics: V+ to V– = 9V, VREF = 1V, TA = +25°C, fCLK = 120 kHz, unless otherwise indicated.

Pin numbers refer to 40-pin DIP.

Symbol

Parameter

Min

Typ Max Unit

Test Conditions

Power

VCOM

DGND

IS

fCLK

Common Voltage

Common Sink Current

Common Source Current

Digital Ground Voltage

Sink Current

Supply Voltage Range

Supply Current Excluding

Common Current

Clock Frequency

VDISP Resistance

Low Battery Flag Activation

Voltage

2.8

3.2

3.5

V V+ to pin 28

—

0.6

—

mA ΔCommon = +0.1V

—

10

—

μA ΔCommon = -0.1V

4.5

5.3

5.8

V V+ to pin 36, V+ to V– = 9V

—

1.2

—

mA ΔDGND = +0.5V

6

9

12

V V+ to V–

—

0.8

1.3

mA V+ to V– = 9V

—

120 360 kHz

—

50

—

kΩ VDISP to V+

6.3

7.2

7.7

V V+ to V–

Digital

Continuity Comparator Threshold 100

Voltages

—

Pull-down Current

—

200

—

mV VOUT pin 27 = High

200

400

mV VOUT pin 27 = Low

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

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.

DS21459D-page 4

© 2006 Microchip Technology Inc.

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