The ICM7244 is an 8-character, alphanumeric display driver

and controller which provides all the circuitry required to

interface a microprocessor or digital system to a 16-segment

display with internal pull-up resistors. It is primarily intended

for use in microprocessor systems, where it minimizes

hardware and software overhead. Incorporated on-chip are a

64-character ASClI decoder, 8x6 memory, high power

character and segment drivers, and the multiplex scan

circuitry.

6-bit ASCll data to be displayed is written into the memory

directly from the microprocessor data bus. Data location

depends upon the selection of either Sequential

(MODE = 1) or Random access mode (MODE = 0). In the

Sequential Access mode the first entry is stored in the

lowest location and displayed in the “l(fā)eft-most” character

position. Each subsequent entry is automatically stored in

the next higher location and displayed to the immediate

“right” of the previous entry. A DISPlay FULL signal is

provided after 8 entries; this signal can be used for

cascading devices together. A CLR pin is provided to clear

the memory and reset the location counter. The Random

Access mode allows the processor to select the memory

address and display digit for each input word.

The character multiplex scan runs whenever data is not

being entered. It scans the memory and CHARacter drivers,

and ensures that the decoding from memory to display is

done in the proper sequence. Intercharacter blanking is

provided to avoid display ghosting.

Features

? 6-Segment Fonts with Decimal Point

? Has Internal Pull-Up Resistors of 617Ω Typ.

? Mask Programmable for Other Font-Sets Up to 64

Characters

? Microprocessor Compatible

? Directly Drives LED Common Cathode Displays

? Cascadable Without Additional Hardware

? Standby Feature Turns Display Off; Puts Chip in Low

Power Mode

? Sequential Entry or Random Entry of Data Into Display

? Single +5V Operation

? Character and Segment Drivers, All MUX Scan Circuitry,

8x6 Static Memory and 64-Character ASCll Font

Generator Included On-Chip

? Pb-Free (RoHS Compliant)