DRAM 256k x 4

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Cross-Reference
BRAND TAG NUMBER PIN COUNT OUTPUT MARKINGS
Samsung KM 4C256 DIP20 SOJ20 ZIP20 . KM4C256
Samsung KM 4C258 DIP20 SOJ20 ZIP20 . KM4C258

Dynamic Random-Access Memory 256K x 4

Size

bit Byte (padded 0000xxxx) Byte (unpadded) Hex
1Mb 256KB 128KB 100000hex

Pinout

SOJ28
         +---\/---+
      A0 | 1    28| Vcc
      A1 | 2    27| A17
      A2 | 3    26| A16
      A3 | 4    25| A15
      A4 | 5    24| A14
      A5 | 6    23| A13
      A6 | 7    22| A12
      A7 | 8    21| A11
      A8 | 9    20| NC
      A9 |10    19| I/O3
     A10 |11    18| I/O2
     *CE |12    17| I/O1
     *OE |13    16| I/O0
     GND |14    15| *WE
         +--------+

LCC32
+-----------------------------------------+
|  5 A10  |          | 21 I/O3  |         |
|  6 A11  | 14 NC    | 22 NC    | 30 A5   |
|  7 A12  | 15 *OE   | 23 NC    | 31 A6   |
|  8 A13  | 16 GND   | 24 NC    | 32 Vcc  |
|  9 A14  | 17 *WE   | 25 A0    |  1 NC   |
| 10 A15  | 18 I/00  | 26 A1    |  2 A7   |
| 11 A16  | 19 I/O1  | 27 A2    |  3 A8   |
| 12 A17  | 20 I/O2  | 28 A3    |  4 A9   |
| 13 *CE  |          | 29 A4    |         |
+-----------------------------------------+

ZIP20
          ^
    A6  1 |
          |  2 Dout
  *CAS  3 |
          |  4 Vss
    A8  5 |
          |  6 Din
   *WE  7 |
          |  8 *RAS
    A0  9 |
          | 10 A2
    A1 11 |
          | 12 Vcc
    A7 13 |
          | 14 A5
    A4 15 |
          | 16 A3
          -

External links

DRAM page on wikipedia

Files