Description
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 desi.
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.
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
Applications
* High-resolution color graphics
* CAE/CAD/CAM
* Image processing
* Video reconstruction
LD
* P[7:0] 40 (A-E)
OL[1,0] 10 (A-E)
SYNC
* BLANK
* CLOCK
Load Control
40
40
Latch
Latch
10
10
MUX Control
Blink Control
8
8
MUX
Read Blink Mask Mask
2
2
