TC7129

DS21459B-page 4

© 2002 Microchip Technology Inc.

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

Pin22SinkCurrent

—

3

—

µA

TC7129 ELECTRICAL SPECIFICATIONS (CONTINUED)

Pinnumbers refer to40-pinDIP.

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 ±1mA. Dissipation ratings assume device is

mounted with all leads soldered to printed circuit board.