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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
μ
W, Maximum
500
μ
W at 5V
Low-Power Shutdown Mode Retains Data With 5
μ
W
Typical Power Consumption at 5V, 1
μ
W 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
TEMP. RANGE (
o
C)
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
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Copyright
Intersil Corporation 1999