| Vanguard RAM chip marking |
| VANGUARD |
www.vis.com.tw |
| VG |
VG - Vanguard Int. |
| 46 - RAM type |
16 - ???
26 - DRAM
36 - SDRAM
37 - SDRAM DDR
46 - SGRAM
86 - SDRAM synchronous |
| V - voltage |
[none] - 5.0V
V - 3.3V low voltage |
| S - refresh mode |
[none] - no self refresh
S - self refresh |
| 440 - memory density |
426 - 256kb x 16bit
440 - 256kb x 4 x 4 (? not sure ?)
832 - 256kb x 32bit
1632 - 512kb x 32 x 2
1640 - 512kb x 4 x 4
1716 - 512kb x16 x 2
1740 - 4Mb x 4
1780 - 1Mb x 8 x 2
1816 - 1Mb x 16bit
64404 - 4Mb x 4 x 4 (64Mb)
64804 - 2Mb x 8 x 4 (64Mb)
64164 - 1Mb x 16 x 4 (64Mb)
12840 - 8Mb x 4 x 4 (128Mb)
12880 - 4Mb x 8 x 4 (128Mb)
6412816 - 2Mb x 16 x 4 (128Mb) |
| 2 - RAM type |
0 - Fast page 2k refresh
1 - ???
2 - ???
3 - EDO
5 - EDO 1k refresh |
| C - die revision |
A/B/C ... |
| J - package option |
J - SOJ
T- TSOP (II)
Q - QFP |
| 5 - min cycle time |
5 - 5.0ns
6 - 6.0ns
10 - 10ns
35 - 35ns
50 - 50ns |
| 642 - date of manufacture |
6 - year of manufacture
42 - week of manufacture |
| WB0EF1 - Serialization code |
? |
