DRAM 256k x 1

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Brand Tag Number Codes 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 MI 1256 MI1256 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)

Speed

bit Byte Hex
256Kb 32KB 40000hex

Cross-Reference

BRAND			TAG	NUMBER

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			MI	  1256	MI1256
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

Note:
*256= Page mode
*257= Nibble mode
*258= Static column mode

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

External links

DRAM page on wikipedia

Files

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