ADV453

The ADV453 is a complete analog video output RAM-DAC on a single monolithic chip. It is specifically designed for high resolution color graphics systems. The part contains a 256x24 color lookup table, a 3x24 overlay palette as well as triple 8-bit video D/A converters. The ADV453 is capable of simultaneously displaying up to 259 colors, 256 from the lookup table and three from the overlay registers, out of a total color palette of 16.8 million addressable colors.

The three overlay registers allow for the implementation of overlaying cursors, pull down menus and grids. There is an independent, asynchronous MPU bus which allows access to the color lookup table without affecting the input of video data via the pixel port. The ADV453 is capable of generating RGB video output signals which are compatible with RS-343A and RS-17 video standards, without requiring external buffering.

The ADV453 is fabricated in a +5V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation. The part is packaged in both a 0.6", 40-pin DIP and a 44-pin plastic leaded (J-lead) chip carrier, PLCC.