DRAM 256k x 4: Difference between revisions

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!MARKINGS
!MARKINGS
|-
|-
|Samsung || KM || 44C256 || DIP20-300mil SOJ20 ZIP20 || . || KM44C256
|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
|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:
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=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>


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<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>


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[[Category:DIP20-300mil]]
[[Category:DIP20-300mil]]
[[Category:SOJ20]]
[[Category:SOJ20]]
[[Category:SOJ26/20-300mil]]
[[Category:ZIP20]]
[[Category:ZIP20]]

Latest revision as of 16:36, 5 February 2024

Cross-Reference
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:
  • 256= Fast page mode
  • 258= Static column mode

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

DRAM page on wikipedia

Files

  • KM44C256 KM44C258 Datasheet

    KM44C256 KM44C258 Datasheet

  • HYB514256 Datasheet

    HYB514256 Datasheet

  • MSM514256A Datasheet

    MSM514256A Datasheet

  • TC514256 Datasheet

    TC514256 Datasheet

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