ICM7228
8-Digit, Microprocessor-
Compatible, LED Display Decoder Driver
August 1997
Features
Description
• Improved 2nd Source to Maxim ICM7218
• Fast Write Access Time of 200ns
The Intersil ICM7228 display driver interfaces microproces-
sors to an 8-digit, 7-segment, numeric LED display. Included
on chip are two types of 7-segment decoder, multiplex scan
circuitry, LED display segment drivers, LED display digit
drivers and an 8-byte static memory as display RAM.
• Multiple Microprocessor Compatible Versions
• Hexadecimal, Code B and No Decode Modes
• Individual Segment Control with “No Decode” Feature
• Digit and Segment Drivers On-Chip
• Non-Overlapping Digits Drive
Data can be written to the ICM7228A and ICM7228B’s display
RAM in sequential 8-digit update or in single-digit update for-
mat. Data is written to the ICM7228C and ICM7228D display
RAM in parallel random access format. The ICM7228A and
ICM7228C drive common anode displays. The ICM7228B and
ICM7228D drive common cathode displays. All versions can
display the RAM data as either Hexadecimal or Code B format.
The ICM7228A and ICM7228B incorporate a No Decode mode
allowing each bit of each digit's RAM word to drive individual
display segments resulting in independent control of all display
segments. As a result, bargraph and other irregular display
segments and formats can be driven directly by this chip.
• Common Anode and Common Cathode LED Versions
• Low Power CMOS Architecture
• Single 5V Supply
Applications
• Instrumentation
• Test Equipment
• Hand Held Instruments
• Bargraph Displays
The Intersil ICM7228 is an alternative to both the Maxim
ICM7218 and the Intersil ICM7218 display drivers. Notice that
the ICM7228A/B has an additional single digit access mode.
This could make the Intersil ICM7218A/B software incompatible
with ICM7228A/B operation.
• Numeric and Non-Numeric Panel Displays
• High and Low Temperature Environments where LCD
Display Integrity is Compromised
Ordering Information
o
PART NUMBER
ICM7228AIPI
DATA ENTRY PROTOCOL
Sequential
Sequential
Random
DISPLAY TYPE
Common Anode
Common Cathode
Common Anode
Common Cathode
Common Anode
Common Cathode
Common Anode
Common Cathode
Common Anode
Common Cathode
Common Anode
Common Cathode
Common Anode
Common Cathode
Common Anode
Common Cathode
TEMP. RANGE ( C)
PACKAGE
28 Ld PDIP
PKG. NO.
E28.6
-40 to 85
ICM7228BIPI
-40 to 85
28 Ld PDIP
E28.6
E28.6
E28.6
F28.6
F28.6
F28.6
F28.6
M28.3
M28.3
M28.3
M28.3
F28.6
F28.6
F28.6
F28.6
ICM7228CIPI
-40 to 85
28 Ld PDIP
ICM7228DIPI
Random
-40 to 85
28 Ld PDIP
ICM7228AIJI
Sequential
Sequential
Random
-40 to 85
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
28 Ld SOIC
ICM7228BIJI
-40 to 85
ICM7228CIJI
-40 to 85
ICM7228DIJI
Random
-40 to 85
ICM7228AIBI
Sequential
Sequential
Random
-40 to 85
ICM7228BIBI
-40 to 85
28 Ld SOlC
ICM7228CIBI
-40 to 85
28 Ld SOlC
ICM7228DIBI
Random
-40 to 85
28 Ld SOlC
ICM7228AMJI883B
ICM7228BMJI883B
ICM7228CMJI883B
ICM7228DMJI883B
Sequential
Sequential
Random
-55 to 125
-55 to 125
-55 to 125
-55 to 125
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
28 Ld CERDIP
Random
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
File Number 3160.1
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