The ICM7218 series of universal LED driver systems
provide, in a single package, all the circuitry necessary to
interface most common microprocessors or digital systems
to an LED display. Included on chip are an 8-byte static
display memory, two types of 7-segment decoders, multiplex
scan circuitry, and high current digit and segment drivers for
either common-cathode or common-anode displays.
The lCM7218A and 1CM7218B feature two control lines
(WRITE and MODE) which write either 4 bits of control
information (DATA COMING, SHUTDOWN, DECODE, and
HEXA/CODE B) or 8 bits of display input data. Display data
is automatically sequenced into the 8-byte internal memory
on successive positive going WRITE pulses. Data may be
displayed either directly or decoded in Hexadecimal or Code
B formats.
The ICM7218C and lCM7218D feature two control lines
(WRITE and HEXA/CODE B/SHUTDOWN), 4 separate
display data input lines, and 3 digit address lines. Display
data is written into the internal memory by setting up a digit
address and strobing the WRITE line low. Only Hexadecimal
and Code B formats are available for display outputs.

Features
• Microprocessor Compatible
• Total Circuit Integration On Chip Includes:
- Digit and Segment Drivers
- All Multiplex Scan Circuitry
- 8-Byte Static Display Memory
- 7-Segment Hexadecimal and Code B Decoders
• Output Drive Suitable for LED Displays Directly
• Common Anode and Common Cathode Versions
• Single 5V Supply Required
• Data Retention to 2V Supply
• Shutdown Feature - Turns Off Display and Puts Chip Into
Low Power Dissipation Mode
• Sequential and Random Access Versions
• Decimal Point Drive On Each Digit