TC7129
TC7129 ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics:
V+ to V- = 9V, V
REF
= 1V, T
A
= +25°C, f
CLK
= 120kHz, unless otherwise indicated.
Pin numbers refer to 40-pin DIP.
Symbol
f
CLK
Parameter
Clock Frequency
V
DISP
Resistance
Low Battery Flag Activation Voltage
Digital
Continuity Comparator Threshold
Voltages
Pull-down Current
"Weak Output" Current
Sink/Source
Pin 22 Source Current
Pin 22 Sink Current
100
—
—
—
—
—
—
200
200
2
3/3
3/9
40
3
—
400
10
—
—
—
—
mV
mV
µA
µA
µA
µA
µA
V
OUT
Pin 27 = High
V
OUT
Pin 27 = Low
Pins 37, 38, 39
Pins 20, 21 Sink/Source
Pin 27 Sink/Source
Min
—
—
6.3
Typ
120
50
7.2
Max
360
—
7.7
Unit
kHz
kΩ
V
V
DISP
to V+
V+ to V-
Test Conditions
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.
MICROCHIP [ MICROCHIP TECHNOLOGY ]
