Datasheet4U Logo Datasheet4U.com

Bt457 - Monolithic CMOS 256-Color Palette RAMDAC

Download the Bt457 datasheet PDF. This datasheet also covers the Bt451 variant, as both devices belong to the same monolithic cmos 256-color palette ramdac family and are provided as variant models within a single manufacturer datasheet.

General Description

The Bt4978 is available in both 84-pin Plastic Leaded Chip Carrier (PLCC) and Ceramic PGA packages, as illustrated in Figure 1 and 2.

Pin descriptions are provided in Table 1.

Pin labels for the PGA package are given in Table 2.

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.

📥 Download Datasheet

Note: The manufacturer provides a single datasheet file (Bt451-Brooktree.pdf) that lists specifications for multiple related part numbers.

Datasheet Details

Part number Bt457
Manufacturer Brooktree
File Size 639.59 KB
Description Monolithic CMOS 256-Color Palette RAMDAC
Datasheet download datasheet Bt457 Datasheet

📁 Similar Datasheet

Part Number Description Manufacturer
BT457 (BT457 / BT458) Monolithic CMOS 256 Color Palette RAMDAC Conexant Systems
BT45228 LCD BATRON
BT45258 LCD BATRON
BT458 (BT457 / BT458) Monolithic CMOS 256 Color Palette RAMDAC Conexant Systems
BT401 DC/DC Converters ETC

Other Datasheets by Brooktree

Part Number Description
Bt451 Monolithic CMOS 256-Color Palette RAMDAC
BT453 Monolithic CMOS
Bt458 Monolithic CMOS 256-Color Palette RAMDAC
BT459 Monolithic CMOS 256 x 24 Color Palette RAMDAC
BT438 Clock Generator Chip

Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

View original datasheet text
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.