DRAM 256k x 1

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Cross-Reference
BRAND TAG NUMBER MARKINGS
Fujitsu MB 81256 MB81256 MB81257 MB81258
Goldstar GM 71C256 GM71256 GM71C256
Hitachi HM 51256 HM51256P HM51256CP HM51256LP HM51256LCP HM51256ZP HM51256LZP HM51258P
Hyundai HY 53C256 HY53C256S HY53C256LS HY53C256F HY53C256LF
Matsushita MN 41256 MN41256
Micron MT 1256 MT1256
Mitsubishi M5M 4256 M5M4256AP M5M4256AJ M5M4256AL M5M4256P M5M4256S M5M4257A M5M4257J M5M4257P M5M4257S
Motorola MCM 6256 MCM6256 MC6256B MCM6257B
NEC uPD 41256 uPD41256C uPD41256L uPD41257C uPD41257L
OKI MSM 41256 MSM41256A MSM51C256 MSM51257
Samsung KM 41256 KM41256A KM41256AJ KM41256AP KM41256AZ KM41257A KM41C256 KM41C257 KM41C258
Sharp LH 21256 LH21256 LH21257 LH21258
Siemens HYB 41256 HYB41256
Texas Instruments TMS 4256 TMS4256 TMS4257
Toshiba TC 51256 TC51256P TC51256PL TC51256T TC51256TL TC51256Z TC51256ZL TC51256 TC51257 TC51258

Dynamic Random-Access Memory 256K x 1 (DIP16, 300mil)(LCC18, 330mil)(ZIP16, 100mil)

Size

bit Byte (padded 0000000x) Byte (unpadded) Hex
256Kb 256KB 32KB 40000hex

Pinout

DIP16
    +--\/--+
 A8 |1   16| Vss
Din |2   15| *CAS
*WE |3   14| Dout
*RAS|4   13| A6
 A0 |5   12| A3
 A2 |6   11| A4
 A1 |7   10| A5
Vcc |8    9| A7
    +------+

LCC18
+---------------------------------------------------------------+
|  3 *WE        |  8 A1         | 12 A4         | 17 *CAS       |
|  4 *RAS       |  9 Vcc        | 13 A3         | 18 Vss        |
|  5 NC         | 10 A7         | 14 NC         |  1 A8         |
|  6 A0         | 11 A5         | 15 A6         |  2 Din        |
|  7 A2         |               | 16 Dout       |               |
+---------------------------------------------------------------+

ZIP16
          ^
    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

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