DRAM 256k x 1

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Cross-Reference
BRAND TAG NUMBER PIN COUNT OUTPUT MARKINGS
Fujitsu MB 81256 DIP16 LCC18 ZIP16 TS MB81256
Fujitsu MB 81257 DIP16 LCC18 ZIP16 TS MB81257
Fujitsu MB 81258 DIP16 LCC18 ZIP16 TS MB81258
Goldstar GM 71256 DIP16 TS GM71256 GM71C256
Hitachi HM 51256 DIP16 LCC18 ZIP16 . HM51256P HM51256CP HM51256LP HM51256LCP HM51256ZP HM51256LZP
Hitachi HM 51258 DIP16 . HM51258P
Hyundai HY 53256 DIP16 LCC18 . HY53C256S HY53C256LS HY53C256F HY53C256LF
Intel D/P 21256 DIP16 LCC18 ZIP16 . D21256
Matsushita MN 41256 DIP16 MN41256
Micron MT 1256 DIP16 MT1256
Mitsubishi M5M 4256 DIP16 LCC18 ZIP16 TS M5M4256AP M5M4256AJ M5M4256AL M5M4256P M5M4256S
Mitsubishi M5M 4257 DIP16 M5M4257A M5M4257J M5M4257P M5M4257S
Motorola MCM 6256 DIP16 TS MCM6256 MC6256B
Motorola MCM 6257 DIP16 MCM6257B
NEC uPD 41256 DIP16 LCC18 TS uPD41256C uPD41256L
NEC uPD 41257 DIP16 LCC18 TS uPD41257C uPD41257L
OKI MSM 41256 DIP16 LCC18 TS MSM41256A
OKI MSM 51256 DIP16 MSM51C256
OKI MSM 51257 DIP16 MSM51257
Samsung KM 41256 DIP16 LCC18 ZIP16 . KM41256 KM41256A KM41256AJ KM41256AP KM41256AZ KM41C256
Samsung KM 41257 DIP16 LCC18 ZIP16 . KM41257 KM41257A KM41C257
Samsung KM 41258 DIP16 KM41C258
Sharp LH 21256 DIP16 ZIP16 . LH21256
Sharp LH 21257 DIP16 LH21257
Sharp LH 21258 DIP16 LH21258
Siemens HYB 41256 DIP16 TS HYB41256
Texas Instruments TMS 4256 DIP16 LCC18 ZIP16 TS TMS4256
Texas Instruments TMS 4257 DIP16 LCC18 ZIP16 TS TMS4257
Toshiba TC 51256 DIP16 TC51256P TC51256PL TC51256T TC51256TL TC51256Z TC51256ZL TC51256
Toshiba TC 51257 DIP16 TC51257
Toshiba TC 51258 DIP16 TC51258
Note:
  • 256= Page mode
  • 257= Nibble mode
  • 258= Static column mode

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

Contents

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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