9-17

August 1997

ICM7228

8-Digit, Microprocessor-

Compatible, LED Display Decoder Driver

Features

• Improved 2nd Source to Maxim ICM7218

• Fast Write Access Time of 200ns

• 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

• Common Anode and Common Cathode LED Versions

• Low Power CMOS Architecture

• Single 5V Supply

Applications

• Instrumentation

• Test Equipment

• Hand Held Instruments

• Bargraph Displays

• Numeric and Non-Numeric Panel Displays

• High and Low Temperature Environments where LCD

Display Integrity is Compromised

Description

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.

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.

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.

Ordering Information

PART NUMBER

DATA ENTRY PROTOCOL

DISPLAY TYPE

PACKAGE

PKG. NO.

ICM7228AIPI

Sequential

Common Anode

-40 to 85

28 Ld PDIP

E28.6

ICM7228BIPI

Sequential

Common Cathode

-40 to 85

28 Ld PDIP

E28.6

ICM7228CIPI

Random

Common Anode

-40 to 85

28 Ld PDIP

E28.6

ICM7228DIPI

Random

Common Cathode

-40 to 85

28 Ld PDIP

E28.6

ICM7228AIJI

Sequential

Common Anode

-40 to 85

28 Ld CERDIP

F28.6

ICM7228BIJI

Sequential

Common Cathode

-40 to 85

28 Ld CERDIP

F28.6

ICM7228CIJI

Random

Common Anode

-40 to 85

28 Ld CERDIP

F28.6

ICM7228DIJI

Random

Common Cathode

-40 to 85

28 Ld CERDIP

F28.6

ICM7228AIBI

Sequential

Common Anode

-40 to 85

28 Ld SOIC

M28.3

ICM7228BIBI

Sequential

Common Cathode

-40 to 85

28 Ld SOlC

M28.3

ICM7228CIBI

Random

Common Anode

-40 to 85

28 Ld SOlC

M28.3

ICM7228DIBI

Random

Common Cathode

-40 to 85

28 Ld SOlC

M28.3

ICM7228AMJI883B

Sequential

Common Anode

-55 to 125

28 Ld CERDIP

F28.6

ICM7228BMJI883B

Sequential

Common Cathode

-55 to 125

28 Ld CERDIP

F28.6

ICM7228CMJI883B

Random

Common Anode

-55 to 125

28 Ld CERDIP

F28.6

ICM7228DMJI883B

Random

Common Cathode

-55 to 125

28 Ld CERDIP

F28.6

File Number

3160.1

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

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