TC7129(2002) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC7129
(Rev.:2002)

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 = 120kHz, unless otherwise indicated.

Pin numbers refer to 40-pin DIP.

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

fCLK

Clock Frequency

—

VDISP Resistance

—

Low Battery Flag Activation Voltage

6.3

120

360

kHz

50

—

kΩ

VDISP to V+

7.2

7.7

V

V+ to V-

Digital

Continuity Comparator Threshold

Voltages

Pull-down Current

100

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 ±400µA. Currents above this value may

result in invalid display readings, but will not destroy the device if limited to ±1mA. Dissipation ratings assume device is

mounted with all leads soldered to printed circuit board.

DS21459B-page 4

© 2002 Microchip Technology Inc.

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