TC7126/A
TABLE 1-1: TC7126/A ELECTRICAL SPECIFICATIONS (CONTINUED)
Electrical Characteristics: VS = +9V, fCLK – 16kHz, and TA = +25°C, unless otherwise noted.
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
VC
Analog Common Voltage
LCD Drive
2.7
3.05
3.35
V
250kΩ Between Common and V+
VSD LCD Segment Drive Voltage
VBD LCD Backplane Drive Voltage
Power Supply
4
5
6
VP-P
V+ to V- = 9V
4
5
6
VP-P
V+ to V- = 9V
IS Power Supply Current
—
55
100
μA
VIN = 0V, V+ to V- = 9V (Note 6)
Note 1: Input voltages may exceed the supply voltages, provided the input current is limited to ±100μA.
2: Dissipation rating assumes device is mounted with all leads soldered to printed circuit board.
3: Refer to “Differential Input” discussion.
4: Backplane drive is in phase with segment drive for “OFF” segment, 180° out of phase for “ON” segment. Frequency is
20 times conversion rate. Average DC component is less than 50mV.
5: See “Typical Application”.
6: During Auto-Zero phase, current is 10-20μA higher. A 48kHz ocillator increases current by 8μA (Typical). Common
current is not included.
DS21458C-page 6
© 2006 Microchip Technology Inc.