Pin Descriptions 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.
Figure 1.
Bt457/8 84-Pin J-Lead Package 74 P2B 73 P2
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
Bt451 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 FSADJUST VREF Distinguishing Features
* 165, 135, 125, 110, 80 MHz operation
* 4:1 or 5:1 input mux
Datasheet Details
Bt451
Brooktree
639.59 KB
Monolithic cmos 256-color palette ramdac.
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