RAMDAC 256 x 18

Cross-Reference

BRAND	TAG	NUMBER	PIN COUNT	OUTPUT	MARKINGS
Analod Devices	ADV	476	DIP28-600mil LCC44		ADV476
Brooktree	BT	471	LCC44	.	BT471KP BT471KPJ
Brooktree	BT	476	DIP28-600mil LCC44	.	BT476KP BT476KPJ
Hualon Microelectronics	HM	86171	DIP28-600mil		HM86171

Random Access Memory Digital-to-Analog Converter 256 x 18 Color Palette (DIP28, 600mil)(LCC44)

Size

bit	Byte (unpadded)	Hex
4608	576	1200hex

Pinout

DIP28
         +---\/---+
     RED | 1    28| Vcc
   GREEN | 2    27| RS1
    BLUE | 3    26| RS0
    Iref | 4    25| *WR
      P0 | 5    24| D7
      P1 | 6    23| D6
      P2 | 7    22| D5
      P3 | 8    21| D4
      P4 | 9    20| D3
      P5 |10    19| D2
      P6 |11    18| D1
      P7 |12    17| D0
    Pclk |13    16| *BLANK
Vss(gnd) |14    15| *RD
         +--------+

              LCC44-690x690mil (valid for 476)
+-----------------------------------------------+
| 40 Clock  |  7 *BLANK  | 18 RS1    | 29 COMP  |
| 41 GND    |  8 D0      | 19 GND    | 30 OPA   |
| 42 GND    |  9 D1      | 20 Vcc    | 31 Vref  |
| 43 GND    | 10 D2      | 21 Vcc    | 32 P0    |
| 44 GND    | 11 D3      | 22 Vcc    | 33 P1    |
|  1 NC     | 12 D4      | 23 GND    | 34 P2    |
|  2 GND    | 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    |
+-----------------------------------------------+

              LCC44-690x690mil (valid for 471)
+-----------------------------------------------+
| 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

DIP28
Set reader to FREQ, put black probe to GND, red probe to 13 to measure CPU clock

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

Files

• 

  ADV476 Datasheet

• 

  BT471 BT476 BT478 Datasheet

• 

  HM86171 Datasheet