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Bt451 Datasheet Monolithic CMOS 256-color Palette Ramdac

Manufacturer: Brooktree

Overview: Bt451 Bt457 125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC Bt458 The Bt457 and Bt458 are pin and software-patible RAMDACs designed specifically for high-performance, high-resolution color graphics. The architecture enables the display of 1280 x 1024 bit-mapped color graphics (up to 8 bits per pixel plus up to 2 bits of overlay information), minimizing the use of costly ECL interfacing, as most of the high-speed (pixel clock) logic is contained on chip. The multiple pixel ports and internal multiplexing enable TTL-patible interface (up to 32 MHz) to the frame buffer, while maintaining the 165 MHz video data rates required for sophisticated color graphics. The Bt457 is a single-channel version of the Bt458 and has a 256 x 8 color lookup table with a single 8-bit video D/A converter. It includes a PLL output to enable subpixel synchronization of multiple Bt457s.

Datasheet Details

Part number Bt451
Manufacturer Brooktree
File Size 639.59 KB
Description Monolithic CMOS 256-Color Palette RAMDAC
Datasheet Bt451-Brooktree.pdf

Key Features

  • include programmable blink rates, bit plane masking and blinking, color overlay capability, and a dual-port color palette RAM. Functional Block Diagram CLOCK.
  • CLOCK VAA GND.

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