DRAM 256k x 4: Difference between revisions
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!MARKINGS | !MARKINGS | ||
|- | |- | ||
| | |OKI || MSM || 514256 || DIP20-300mil SOJ26/20-300mil ZIP20 || . || M514256 M514256C MSM514256A | ||
|- | |- | ||
|Samsung || KM || 44C258 || DIP20 SOJ20 ZIP20 || . || KM44C258 | |Samsung || KM || 44C256 || DIP20-300mil SOJ20 ZIP20 || . || KM44C256 KM44C256CP | ||
|- | |||
|Samsung || KM || 44C258 || DIP20-300mil SOJ20 ZIP20 || . || KM44C258 | |||
|- | |||
|Siemens || HYB || 514256 || DIP20-300mil SOJ26/20-300mil || . || HYB514256 HYB514256B | |||
|- | |||
|Toshiba || TC || 514256 || DIP20-300mil SOJ26/20-300mil ZIP20 || . || TC514256 TC514256A | |||
|- | |- | ||
|Note: | |Note: | ||
| Line 33: | Line 39: | ||
=Pinout= | =Pinout= | ||
<pre> | <pre> | ||
DIP20 SOJ20 | DIP20 SOJ20 | ||
+---\/---+ | +---\/---+ | ||
DQ1 | 1 20| Vss | DQ1 | 1 20| Vss | ||
| Line 47: | Line 53: | ||
+--------+ | +--------+ | ||
ZIP20 | ZIP20 | ||
^ | ^ | ||
*G 1 | | *G 1 | | ||
| Line 70: | Line 76: | ||
| 20 A8 | | 20 A8 | ||
- | - | ||
SOJ26/20-300mil | |||
+---\/---+ | |||
DQ1 | 1 26| Vss | |||
DQ2 | 2 25| DQ4 | |||
*WE | 3 24| DQ3 | |||
*RAS | 4 23| *CAS | |||
NC | 5 22| *OE | |||
| 6 21| | |||
| 7 20| | |||
| 8 19| | |||
A0 | 9 18| A8 | |||
A1 |10 17| A7 | |||
A2 |11 16| A6 | |||
A3 |12 15| A5 | |||
Vcc |13 14| A4 | |||
+--------+ | |||
</pre> | </pre> | ||
| Line 78: | Line 102: | ||
<gallery widths="150px"> | <gallery widths="150px"> | ||
File:km44c256.pdf|KM44C256 KM44C258 Datasheet | File:km44c256.pdf|KM44C256 KM44C258 Datasheet | ||
File:hyb514256.pdf|HYB514256 Datasheet | |||
File:m514256a.pdf|MSM514256A Datasheet | |||
File:tc514256.pdf|TC514256 Datasheet | |||
</gallery> | </gallery> | ||
[[Category:RAM]] | [[Category:RAM]] | ||
[[Category:DIP20]] | [[Category:DIP20-300mil]] | ||
[[Category:SOJ20]] | [[Category:SOJ20]] | ||
[[Category:SOJ26/20-300mil]] | |||
[[Category:ZIP20]] | [[Category:ZIP20]] | ||
Latest revision as of 16:36, 5 February 2024
| BRAND | TAG | NUMBER | PIN COUNT | OUTPUT | MARKINGS |
|---|---|---|---|---|---|
| OKI | MSM | 514256 | DIP20-300mil SOJ26/20-300mil ZIP20 | . | M514256 M514256C MSM514256A |
| Samsung | KM | 44C256 | DIP20-300mil SOJ20 ZIP20 | . | KM44C256 KM44C256CP |
| Samsung | KM | 44C258 | DIP20-300mil SOJ20 ZIP20 | . | KM44C258 |
| Siemens | HYB | 514256 | DIP20-300mil SOJ26/20-300mil | . | HYB514256 HYB514256B |
| Toshiba | TC | 514256 | DIP20-300mil SOJ26/20-300mil ZIP20 | . | TC514256 TC514256A |
Note:
|
Dynamic Random-Access Memory 256K x 4
Size
| bit | Byte (padded 0000xxxx) | Byte (unpadded) | Hex |
|---|---|---|---|
| 1Mb | 256KB | 128KB | 100000hex |
Pinout
DIP20 SOJ20
+---\/---+
DQ1 | 1 20| Vss
DQ2 | 2 19| DQ4
*W | 3 18| DQ3
*RAS | 4 17| *CAS
NC | 5 16| *G
A0 | 6 15| A8
A1 | 7 14| A7
A2 | 8 13| A6
A3 | 9 12| A5
Vcc |10 11| A4
+--------+
ZIP20
^
*G 1 |
| 2 *CAS
DQ3 3 |
| 4 DQ4
Vss 5 |
| 6 DQ1
DQ2 7 |
| 8 *W
*RAS 9 |
| 10 NC
A0 11 |
| 12 A1
A2 13 |
| 14 A3
Vcc 15 |
| 16 A4
A5 17 |
| 18 A6
A7 19 |
| 20 A8
-
SOJ26/20-300mil
+---\/---+
DQ1 | 1 26| Vss
DQ2 | 2 25| DQ4
*WE | 3 24| DQ3
*RAS | 4 23| *CAS
NC | 5 22| *OE
| 6 21|
| 7 20|
| 8 19|
A0 | 9 18| A8
A1 |10 17| A7
A2 |11 16| A6
A3 |12 15| A5
Vcc |13 14| A4
+--------+
External links
Files
-
KM44C256 KM44C258 Datasheet -
HYB514256 Datasheet
-
MSM514256A Datasheet
-
TC514256 Datasheet
