DRAM 1k x 1

Cross-Reference

BRAND	TAG	NUMBER	PIN COUNT	OUTPUT	MARKINGS
Intel	D/P	1103	18		D1103 D1103A
Intel	D/P	2105	18	CS	D2105
National Semiconductors	MM	4261	18	TS	MM4261
National Semiconductors	MM	5260	18	TS	MM5260
National Semiconductors	MM	5261	18	TS	MM5261
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
• 
  MM4261 / MM5261 Datasheet
• 
  MM5260 Datasheet