Datasheet

TC7129
DS21459E-page 4  2002-2012 Microchip Technology Inc.
Power
V
COM
Common Voltage 2.8 3.2 3.5 V V+ to pin 28
Common Sink Current — 0.6 — mA Common = +0.1V
Common Source Current — 10 — A Common = -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 DGND = +0.5V
Supply Voltage Range 6 9 12 V V+ to V–
I
S
Supply Current Excluding
Common Current
— 0.8 1.3 mA V+ to V– = 9V
f
CLK
Clock Frequency — 120 360 kHz
V
DISP
Resistance — 50 — k V
DISP
to V+
Low Battery Flag Activation
Voltage
6.3 7.2 7.7 V V+ to V–
Digital
Continuity Comparator Threshold
Voltages
100 200 — mV V
OUT
pin 27 = High
— 200 400 mV V
OUT
pin 27 = Low
Pull-down Current — 2 10 A Pins 37, 38, 39
“Weak Output” Current
Sink/Source
— 3/3— A Pins 20, 21 sink/source
— 3/9— A Pin 27 sink/source
Pin 22 Source Current — 40 — A
Pin 22 Sink Current — 3 — A
TC7129 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: V+ to V– = 9V, V
REF
= 1V, T
A
= +25°C, f
CLK
= 120 kHz, unless otherwise indicated.
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 A. 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.