RAMDAC 256 x 18

Cross-Reference

BRAND	TAG	NUMBER	PIN COUNT	OUTPUT	MARKINGS
Analod Devices	ADV	476	DIP28 LCC44		ADV476
Hualon Microelectronics	HM	86171	DIP28		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
+---------------------------------------------------------------+
| 40 Pclk       |  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         |
+---------------------------------------------------------------+

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 7 to measure CPU clock

Files

• 
  ADV476 Datasheet
• 
  HM86171 Datasheet