RAMDAC 256 x 24

Cross-Reference

BRAND	TAG	NUMBER	PIN COUNT	OUTPUT	MARKINGS
Brooktree	BT	478	LCC44	.	BT478KP BT478KPJ

Random Access Memory Digital-to-Analog Converter 256 x 24 Color Palette (LCC44)

Size

bit	Byte (unpadded)	Hex
6177	768	1800hex

Pinout

              LCC44-690x690mil
+-----------------------------------------------+
| 40 Clock  |  7 *BLANK  | 18 RS1    | 29 COMP  |
| 41 OL0    |  8 D0      | 19 GND    | 30 OPA   |
| 42 OL1    |  9 D1      | 20 Vcc    | 31 Vref  |
| 43 OL2    | 10 D2      | 21 Vcc    | 32 P0    |
| 44 OL3    | 11 D3      | 22 Vcc    | 33 P1    |
|  1 NC     | 12 D4      | 23 SETUP  | 34 P2    |
|  2 NC     | 13 D5      | 24 GND    | 35 P3    |
|  3 GND    | 14 D6      | 25 RED    | 36 P4    |
|  4 Vcc    | 15 D7      | 26 GREEN  | 37 P5    |
|  5 GND    | 16 *WR     | 27 BLUE   | 38 P6    |
|  6 *RS    | 17 RS0     | 28 Iref   | 39 P7    |
+-----------------------------------------------+

External links

RAM-DAC page on wikipedia

Frequency

PLCC44
Set reader to FREQ, put black probe to GND, red probe to 40 to measure CPU clock

Files

• 

  BT478 Datasheet