9-19

August 1997

ICM7231, ICM7232

Numeric/Alphanumeric Triplexed

LCD Display Drivers

Features

• ICM7231 Drives 8 Digits of 7 Segments with Two

Independent Annunciators Per Digit Address and Data

Input in Parallel Format

• ICM7232 Drives 10 Digits of 7 Segments with Two

Independent Annunciators Per Digit Address and Data

Input in Serial Format

• All Signals Required to Drive Rows and Columns of

Triplexed LCD Display are Provided

• Display Voltage Independent of Power Supply

• On-Chip Oscillator Provides All Display Timing

• Total Power Consumption Typically 200

µW, Maximum

500

µW at 5V

• Low-Power Shutdown Mode Retains Data With 5

µW

Typical Power Consumption at 5V, 1

µW at 2V

• Direct Interface to High-Speed Microprocessors

Description

The ICM7231 and ICM7232 family of integrated circuits are

designed to generate the voltage levels and switching wave-

forms required to drive triplexed liquid-crystal displays.

These chips also include input buffer and digit address

decoding circuitry allowing six bits of input data to be

decoded into 64 independent combinations of the output

segments of the selected digit.

The family is designed to interface to modern high-

performance microprocessors and microcomputers and

ease system requirements for ROM space and CPU time

needed to service a display.

Ordering Information

PART NUMBER

PACKAGE

NUMBER OF DIGITS

INPUT FORMAT

PKG. NO.

ICM7231BFIJL

-25 to 85

40 Ld CERDIP

8 Digit

Parallel

F40.6

ICM7231BFIPL

-25 to 85

40 Ld PDIP

8 Digit

Parallel

E40.6

ICM7232BFIPL

-25 to 85

40 Ld PDIP

10 Digit

Serial

E40.6

ICM7232CRIPL

-25 to 85

40 Ld PDIP

10 Digit

Serial

E40.6

NOTE:

All versions intended for triplexed LCD displays.

File Number

3161.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

http://www.intersil.com or 407-727-9207