DRAM 256k x 1

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		D21256
Matsushita	MN	41256	DIP16		MN41256
Micron	MT	1256	DIP16		MT1256
Mitsubishi	M5M	4256	DIP16		M5M4256AP M5M4256AJ M5M4256AL M5M4256P M5M4256S
Mitsubishi	M5M	4257	DIP16		M5M4257A M5M4257J M5M4257P M5M4257S
Motorola	MCM	6256	DIP16		MCM6256 MC6256B
Motorola	MCM	6257	DIP16		MCM6257B
NEC	uPD	41256	DIP16		uPD41256C uPD41256L
NEC	uPD	41257	DIP16		uPD41257C uPD41257L
OKI	MSM	41256	DIP16		MSM41256A
OKI	MSM	51256	DIP16		MSM51C256
OKI	MSM	51257	DIP16		MSM51257
Samsung	KM	41256	DIP16		KM41256A KM41256AJ KM41256AP KM41256AZ KM41C256
Samsung	KM	41257	DIP16		KM41257A KM41C257
Samsung	KM	41258	DIP16		KM41C258
Sharp	LH	21256	DIP16		LH21256
Sharp	LH	21257	DIP16		LH21257
Sharp	LH	21258	DIP16		LH21258
Siemens	HYB	41256	DIP16		HYB41256
Texas Instruments	TMS	4256	DIP16		TMS4256
Texas Instruments	TMS	4257	DIP16		TMS4257
Toshiba	TC	51256	DIP16		TC51256P TC51256PL TC51256T TC51256TL TC51256Z TC51256ZL TC51256
Toshiba	TC	51257	DIP16		TC51257
Toshiba	TC	51258	DIP16		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

• 

  MB1256 Datasheet

• 

  MB81257 Datasheet

• 

  HM51256 Datasheet

• 

  HM51258 Datasheet

• 

  HY53C256 Datasheet

• 

  GM71256 Datasheet

• 

  M5M4256 Datasheet

• 

  MCM6256B Datasheet

• 

  D21256 Datasheet

• 

  HYB41256 Datasheet

• KM41256-KM41257 Datasheet

  KM41256-KM41257 Datasheet

• 

  LH21256 Datasheet

• 

  MSM41256 Datasheet

• 

  TMS4256-TMS4257 Datasheet

• 

  uPD41256 Datasheet

• 

  uPD41257 Datasheet