ADV471

a CMOS 80 MHz Monolithic 256 ؋ 24(18) Color Palette RAM-DACs ADV478/ADV471 FEATURES Personal System/2* Compatible FUNCTIONAL BLOCK DIAGRAM 80 MHz Pipelined Operation Triple 8-Bit (6-Bit) D/A Converters 256 ؋ 24(18) Color Palette RAM 15 ؋ 24(18) Overlay Registers RS-343A/RS-170 Compatible Outputs Sync on All Three Channels Programmable Pedestal (0 or 7.5 IRE) External Voltage or Current Reference Standard MPU Interface +5 V CMOS Monolithic Construction 44-Pin PLCC Package Power Dissipation: 800 mW OAPPLICATIONS BHigh Resolution Color Graphics SCAE/CAD/CAM Applications Image Processing OInstrumentation Desktop Publishing LAVAILABLE CLOCK RATES E80 MHz T66 MHz E50 MHz 35 MHz GENERAL DESCRIPTION The ADV478 (ADV®) and ADV471 are pin compatible and software compatible RAM-DACs designed specifically for Personal System/2 compatible color graphics. The ADV478 has a 256 × 24 color lookup table with triple 8-bit video D/A converters. It may be configured for either 6 bits or 8 bits per color operation. The ADV471 has a 256 × 18 color lookup table with triple 6-bit video D/A converters. Options on both parts include a programmable pedestal (0 or 7.5 IRE) and use of an external voltage or current reference. ADV is a registered trademark of Analog Devices, Inc. *Personal System/2 is a trademark of International Business Machines Corp. Fifteen overlay registers provide for overlaying cursors, grids, menus, EGA emulation, etc. Also supported is a pixel read mask register and sy...