REV. B

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a

CMOS 66 MHz Monolithic 256 24

Color Palette RAM-DAC

ADV453

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 617/329-4700

Fax: 617/326-8703

FUNCTIONAL BLOCK DIAGRAM

FEATURES

66 MHz Pipelined Operation

Triple 8-Bit D/A Converters

256 24 Color Palette RAM

3 24 Overlay Registers

RS-343A/RS-170 Compatible Outputs

5 V CMOS Monolithic Construction

40-Pin DIP or Small 44-Pin PLCC Package

Power Dissipation: 1000 mW

APPLICATIONS

High Resolution Color Graphics

CAE/CAD/CAM Applications

Image Processing

Instrumentation

Desktop Publishing

AVAILABLE CLOCK RATES

66 MHz

40 MHz

**Macintosh II is a registered trademark of Apple Computer Inc.

PRODUCT HIGHLIGHTS

1. Fast video refresh rate, 66 MHz.

2. Compatible with a wide variety of high resolution color

graphics systems including VGA* and Macintosh II.**

3. Three overlay registers allow for implementation of overlay-

ing cursors, pull down menus and grids.

4. Guaranteed monotonic. Integral and differential nonlineari-

ties guaranteed to be a maximum of

±1 LSB.

5. Low glitch energy, 50 pV secs.

GENERAL DESCRIPTION

The ADV453 is a complete analog video output RAM-DAC on

a single monolithic chip. It is specifically designed for high reso-

lution color graphics systems. The part contains a 256

24

color lookup table, a 3

24 overlay palette as well as triple 8-bit

video D/A converters. The ADV453 is capable of simulta-

neously 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 implementation of overlay-

ing cursors, pull down menus and grids. There is an indepen-

dent, 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-170

video standards, without requiring external buffering.

The ADV453 is fabricated in a +5 V CMOS process. Its mono-

lithic 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.