DRAM 1k x 1

Cross-Reference

BRAND	TAG	NUMBER	PIN COUNT	OUTPUT	MARKINGS
Intel	I	1103	18		I1103 I1103A
Intel	I	2105	18	CS	I2105
National Semiconductors	MM	4261	18	TS	MM4261 MM5261
National Semiconductors	MM	5260	18	TS	MM5260
Micronas	ITT	1103	18		ITT1103

Dynamic Random-Access Memory 1K x 1 (DIP18, 300mil)

Size

bit	Byte (padded 0000000x)	Byte (unpadded)	Hex
1Kb	1kB	128B	400hex

Pinout

DIP18 (only Intel 2105)
         +---\/---+
      A3 | 1    18| WE
      A2 | 2    17| Vdd (+12V)
      A0 | 3    16| CE
      A1 | 4    15| A4
 REFRESH | 5    14| *DATA OUT
      A9 | 6    13| A8
      A6 | 7    12| DATA IN
      A5 | 8    11| Vss (GND)
      A7 | 9    10| Vbb (-5V)
         +--------+


DIP18 (all the others)
         +---\/---+
      A0 | 1    18| A7
      A4 | 2    17| A8
     R/W | 3    16| A9
      A1 | 4    15| *CHIP ENABLE
      A2 | 5    14| DATA I/O
      A3 | 6    13| PRECHARGE
      A5 | 7    12| Vcc
      A6 | 8    11| Vdd
      NC | 9    10| Vss
         +--------+

External links

DRAM page on wikipedia

Files

• D2105 Datasheet
  D2105 Datasheet
• 
  MM4261 / MM5261 Datasheet
• 
  MM5260 Datasheet