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Bt451 Bt457
125 MHz/135 MHz/165 MHz Monolithic CMOS 256 Color Palette RAMDAC
Bt458
The Bt457 and Bt458 are pin and software-compatible 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-compatible interface (up to 32 MHz) to the frame buffer, while maintaining the 165 MHz video data rates required for sophisticated color graphics.
Bt451 Datasheet
