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Understanding RAM chip numbers: LGS

Link naar de fabrikant. Link to the manufacturer.

Sample Explanation
16 Mb Chip organised as: 4M x 4 bits
2K refresh, Fast Page Mode (FPM)
Speed = 60ns, Supply = 5 Volt
16 Mb Chip organised as: 1M x 16 bits
1K refresh, Fast Page Mode (FPM)
Speed = 60ns, Supply = 5 Volt

 

Click here on the appropriate beginning of the number: 
GM71... (EDO or FPM), GM72... (SDRAM)

LGS (GM) - 16 Megabit EDO or FPM

GM71C17400BJ6
^^^---------------- GM7 = LGS: Lucky Gold Star
GM71C17400BJ6
   ^--------------- 1 = FPM or EDO
                    2 = SDRAM: See below
GM71C17400BJ6
               ?--- 1 = 16 Megabit chip
                    4 = 4  Megabit chip: Click here
GM71C17400BJ6
    ^-------------- C = 5 volt
                    V = 3,3 volt
GM71C17400BJ6
      ^------------ 8 = 1K refresh
                    7 = 2K refresh
                    6 = 4K refresh
GM71C17400BJ6
       ^^---------- Internal Organization: 
                    10 = 16Meg x 1: check module size/banks
                    16 = 1Meg x 16: check module size/banks
                    40 = 4Meg x 4 : check module size/banks
                    80 = 2Meg x 8 : check module size/banks
GM71C17400BJ6
         ^--------- 0 = FPM (Fast Page Mode)
                    3 = EDO
                    5 = EDO
GM71C17400BJ6
            ^------ Speed: 5=50ns / 6=60ns / 7=70ns

LGS (GM) - SDRAM

GM72V661641CT7J
^^^---------------- GM7 = LGS: Lucky Gold Star
GM72V661641CT7J
   ^--------------- 1 = FPM or EDO: See above
                    2 = SDRAM
GM72V661641CT7J
    ^-------------- C = 5 volt
                    V = 3,3 volt
GM72V661641CT7J
     ^------------- 1 = 16  Megabit chip
                    2 = 128 Megabit chip
                    5 = 256 Megabit chip
                    6 = 64  Megabit chip
GM72V661641CT7J
     ^^^^^--------- Internal Organization: 
                    16162 = 1Meg x 16 (16Mb chip) : check module size
                    1642  = 4Meg  x 4 (16Mb chip) : check module size
                    1682  = 2Meg  x 2 (16Mb chip) : check module size

                    28164 = 8Meg x 16 (128Mb chip): check module size
                    2844  = 32Meg x 4 (128Mb chip): check module size
                    2884  = 16Meg x 8 (128Mb chip): check module size

                    56164 = 16Meg x 16(256Mb chip): check module size
                    5644  = 64Meg x 4 (256Mb chip): check module size
                    5684  = 32Meg x 8 (256Mb chip): check module size

                    66164 = 4Meg x 16 (64Mb chip) : check module size
                    6644  = 16Meg x 4 (64Mb chip) : check module size
                    6684  = 8Meg x 8  (64Mb chip) : check module size
GM72V661641CT7J
          ^-------- 1
GM72V661641CT7J
           ^^------ CT / CLT (Revision?)
GM72V661641CT7J
             ^^---- Speed: 
                    10K = PC66 specifications.     (tCK=15ns,tAC=9ns,CL=2,tRCD=2,tRP=2) 
                    7K  = PC100,222 specifications.(tCK=10ns,tAC=6ns,CL=2,tRCD=2,tRP=2) 
                    7J  = PC100,322 specifications.(tCK=10ns,tAC=6ns,CL=3,tRCD=2,tRP=2) 
                    8   = 125MHz specifications.   (tCK=8ns,tAC=6ns,CL=3,tRCD=3,tRP=3) 
                    75  = PC133 specifications.    (tCK=7.5ns,tAC=5.4ns,CL=3,tRCD=3,tRP=3) 
                    7   = 143MHz specifications.   (tCK=7ns,tAC=5.4ns,CL=3,tRCD=3,tRP=3)