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Understanding RAM chip numbers: Micron

Link naar de fabrikant. Link to the manufacturer.

Micron (MT) - SDRAM

How do I read the type number?

MT48LC16M8A2-75B-6
^^------------------- MT = Micron Technology Inc.
MT48LC16M8A2-75B-6
  ^^----------------- 48 = Synchronous DRAM
MT48LC16M8A2-75B-6
    ^---------------- L = 3,3volt / blank = 5volt / V = 2,5volt
MT48LC16M8A2-75B-6
     ^--------------- C = CMOS
                      B = BiCMOS
MT48LC16M8A2-75B-6
      ^^^^----------- Internal Organization: 
                      16M8  = 4 Banks x 4M x 8  (128Mbit) : check module size/banks
                      32M4  = 4 Banks x 8M x 4  (128Mbit) : check module size/banks
                      8M16  = 4 Banks x 2M x 16 (128Mbit) : check module size/banks
MT48LC16M8A2-75B-6
             ^^------ Snelheid:

Micron (MT) - 4 Megabit

How do I read the type number?

MT4C4007J-6
^^----------------- MT = Micron Technology Inc.
MT4C4007J-6
  ^---------------- 4 = DRAM
MT4C4007J-6
   ^--------------- C = CMOS
MT4C4007J-6
    ^^^^----------- 1004  = 4Meg x 1 , Fast Page, ?? refresh
                    4001  = 1Meg x 4 , Fast Page, ?? refresh
                    4007  = 1Meg x 4 , EDO, 1K refresh
                    16270 = 256K x 16, EDO, ?? refresh
                    16257 = 256K x 16, Fast Page, ?? refresh
MT4C4007J-6
          ^-------- Speed: 5 = 50ns / 6 = 60ns / 7=70ns

Micron (MT) - 16/64 Megabit

How do I read the type number?

MT4LC4M4E8DJ-6
^^----------------- MT = Micron Technology Inc.
MT4LC4M4E8DJ-6
  ^---------------- 4  = DRAM
                    28 = Flash (Dual Supply)
                    41 = SGRAM
                    46 = Double Data Rate SDRAM
                    48 = Synchronous DRAM
                    57 = Double Data Rate Synchronous DRAM
                    58 = SyncBurst SRAM
                    59 = Synchronous Late Write SRAM
MT4LC4M4E8DJ-6
   ^--------------- L = 3,3volt / blank = 5volt / V = 2,5volt
MT4LC4M4E8DJ-6
    ^-------------- C = CMOS
                    B = BiCMOS
MT4LC4M4E8DJ-6
     ^^^----------- Internal Organization: 
                    8M8  = 8Meg x 8 : check module size/banks
                    4M4  = 4Meg x 4 : check module size/banks
                    2M8  = 2Meg x 8 : check module size/banks
                    1M16 = 1Meg x 16: check module size/banks
MT4LC4M4E8DJ-6
        ^^--------- E5 = 1K refresh - EDO
                    E7 = 2K refresh - EDO
                    E8 = 2K refresh - EDO
                    E9 = 4K refresh - EDO
                    A1 = 4K refresh - Fast Page
                    B1 = 2K refresh - Fast Page
                    C3 = 1K refresh - Fast Page
MT4LC4M4E8DJ-6
          ^^------- Type Behuizing (van de chip)
MT4LC4M4E8DJ-6
             ^----- Snelheid: 5 = 50ns / 6 = 60ns / 7=70ns

Micron (MT) - Cache Chip

How do I read the type number?

MT58LC64K18B2LG-10
^^----------------- MT = Micron Technology Inc.
MT58LC64K18B2LG-10
  ^^--------------- 58 = SyncBurst SRAM
                    4  = DRAM
                    28 = Flash (Dual Supply)
                    41 = SGRAM
                    48 = Synchronous DRAM
                    57 = Double Data Rate Synchronous DRAM
                    59 = Synchronous Late Write SRAM
MT58LC64K18B2LG-10
    ^-------------- L = 3,3volt / blank = 5volt / V = 2,5volt
MT58LC64K18B2LG-10
     ^------------- C = CMOS
                    B = BiCMOS
MT58LC64K18B2LG-10
      ^^^^^-------- Internal Organization: 
                    64K18  = 64K x 18 : check module size/banks
                    64K36  = 64K x 36 : check module size/banks
                    32K36  = 32K x 36 : check module size/banks
MT58LC64K18B2LG-10
           ^^------ B2 = Takes 3.3 volt and 5 volt signal levels
                    B3 = Takes 3.3 volt signal levels only
MT58LC64K18B2LG-10
                ^^- Speed: 10 = 10ns etc.