DRAM 256k x 1

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
Intel	D/P	21256	D21256
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

• 81256 Datasheet

  81256 Datasheet

• 81257 Datasheet

  81257 Datasheet

• 51256 Datasheet

  51256 Datasheet

• 51258 Datasheet

  51258 Datasheet

• 53C256 Datasheet

  53C256 Datasheet

• 71256 Datasheet

  71256 Datasheet

• 4256 Datasheet

  4256 Datasheet

• 6256 Datasheet

  6256 Datasheet

• 

  D21256 Datasheet

• 

  HYB41256 Datasheet

• KM41256-KM41257 Datasheet

  KM41256-KM41257 Datasheet

• 

  LH21256 Datasheet

• 

  MSM41256 Datasheet

• 

  TMS4256-TMS4257 Datasheet

• 

  uPD41256 Datasheet

• 

  uPD41257 Datasheet