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476KP80 / ADV476KP80E / ADV476 / ram-dac ic
476KP80 / ADV476KP80E / ADV476 / ram-dac ic
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The following spec sheet is provided by the manufacturer. It may cover several different components and/or versions. I am only offering the part in the heading and picture.
* Personal System/2* and VGA* Compatible
* Plug-in Replacement for INMOS 171/176
* 66 MHz Pipelined Operation
* Three 6-Bit D/A Converters
* RS-343A/RS-170 Compatible Outputs
* Blank on All Three Channels
* Asynchronous Access to All Internal Registers
* 15 V CMOS Monolithic Construction
* High Resolution Color Graphics
The ADV476 (ADV®) is a pin compatible and software compatible RAM-DAC designed specifically for VGA and Personal System/2 color graphics.
The ADV476 is a complete analog output RAM-DAC on a single monolithic chip. The part contains a 256318 color lookup table, a pixel mask register as well as a triple 6-bit video D/A converter. The ADV476 is capable of simultaneously displaying up to 256 colors, from a total color palette of 262,144 addressable colors.
The on-chip asynchronous MPU bus allows access to the color lookup table without affecting the input video data via the pixel port. The pixel read mask register provides a convenient way of altering the displayed colors without updating the color lookup table. The ADV476 is capable of generating RGB video output signals which are compatible with RS-343A and RS-170 video standards, without requiring external buffering.
The ADV476 is fabricated in a +5 V CMOS process. Its monolithic CMOS construction ensures greater functionality with low power dissipation and small board area. The part is packaged in a 44-pin PLCC.
1. Standard video refresh rates, 35 MHz, 50 MHz and 66 MHz.
2. Fully compatible with VGA and Personal System/2 color graphics.
3. Guaranteed monotonic. Integral and differential linearity guaranteed to be a maximum of ±1 LSB.
4. Low glitch energy, 75 pV secs.
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