DRAM 256k x 4

Cross-Reference

BRAND	TAG	NUMBER	PIN COUNT	OUTPUT	MARKINGS
Samsung	KM	4C256	DIP20 SOJ20 ZIP20	.	KM4C256
Samsung	KM	4C258	DIP20 SOJ20 ZIP20	.	KM4C258
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
          -

External links

DRAM page on wikipedia

Files

• KM4C256 KM4C258 Datasheet

  KM4C256 KM4C258 Datasheet