TC7136/TC7136A

DS21461B-page 6

© 2002 Microchip Technology Inc.

Analog Common

Analog Common Temperature

Coefficient

250k

Ω between Common and V+

TC7136A

—

35

75

ppm/°C

0°C

TC7136

—

70

150

ppm/°C

"C" Commercial Temp. Range Devices

TC7136A

—

35

100

ppm/°C

-25°C

≤ T

TC7136

—

70

150

ppm/°C

"I" Industrial Temp. Range Devices

Analog Common Voltage

2.7

3.05

3.35

V

250k

Ω Between Common and V+

LCD Drive

LCD Segment Drive Voltage

4

5

6

V+ to V- = 9V

LCD Backplane Drive Voltage

4

5

6

V+ to V- = 9V

Power Supply

Power Supply Current

—

70

100

TC7136 AND TC7136A ELECTRICAL SPECIFICATIONS (CONTINUED)

Symbol

Parameter

Min

Typ

Max

Unit

Test Conditions

Note

1:

Input voltages may exceed supply voltages when input current is limited to 100

µA.

2:

Dissipation rating assumes device is mounted with all leads soldered to PC board.

3:

Refer to "Differential Input" discussion.

4:

Backplane drive is in phase with segment drive for "OFF" segment and 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:

A 48kHz oscillator increases current by 20

µA (typical). Common current not included.