ICM7243

Features:

• 14-Segment and 16-Segment Fonts with Decimal Point
• 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, 8 x 6 Static Memory and 64-Character ASCll Font Generator Included On-Chip




Pinout






Specifications

Supply Voltage V_DD - V_SS . . . . . . . . . . . . . . . . . . . . . . . .+6.0V
Input Voltage (Any Terminal) . . . . . . . V_DD +0.3V to V_SS -0.3V
CHARacter Output Current. . . . . . . . .. . . . . . . . . . . . . .300mA
SEGment Output Current . . . . . . . .. . . . . . . . . . . . . . . .30mA




Description

The ICM7243 is an 8-character, alphanumeric display driverand controller which provides all the circuitry required tointerface a microprocessor or digital system to a 14-segmentor 16-segment display. It is primarily intended for use inmicroprocessor systems, where it minimizes hardware andsoftware overhead. Incorporated on-chip are a 64-characterASClI decoder, 8 x 6 memory, high power character andsegment drivers, and the multiplex scan circuitry.6-bit ASCll data to be displayed is written into the memorydirectly from the microprocessor data bus. Data locationdepends upon the selection of either Sequential(MODE = 1) or Random access mode (MODE = 0). In theSequential Access mode the first entry is stored in thelowest location and displayed in the left-most characterposition. Each subsequent entry of the ICM7243 is automatically stored inthe next higher location and displayed to the immediateright of the previous entry. A DISPlay FULL signal is providedafter 8 entries; this signal can be used for cascadingdevices together. A CLeaR pin of the ICM7243  is provided to clear the memoryand reset the location counter. The Random Accessmode allows the processor to select the memory addressand display digit for each input word.The character multiplex scan runs whenever data is notbeing entered. It scans the memory and CHARacter drivers,and ensures that the decoding from memory to display isdone in the proper sequence. Intercharacter blanking isprovided to avoid display ghosting.