DRAM 256k x 1
From Citylan
| 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
Files
-
MB1256 Datasheet
-
MB81257 Datasheet
-
HM51256 Datasheet
-
HM51258 Datasheet
-
HY53C256 Datasheet
-
GM71256 Datasheet
-
M5M4256 Datasheet
-
MCM6256B Datasheet
-
D21256 Datasheet
-
HYB41256 Datasheet
-
KM41256-KM41257 Datasheet
-
LH21256 Datasheet
-
MSM41256 Datasheet
-
TMS4256-TMS4257 Datasheet
-
uPD41256 Datasheet
-
uPD41257 Datasheet
