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Understanding RAM chip numbers: Toshiba

Link to the manufacturer.

Sample Explanation

512KB SRAM chip (used in PowerBook modules)
Speed = 80ns, Supply = 5 Volt

Toshiba (TC) - 4 Megabit

How do I read the type number?

TC51V4400CSJ-60
^^^---------------- TC5 = Hitachi Memory
TC51V4400CSJ-60
   ^--------------- 1 = OK
                    2 = VRAM : See below Click here 
TC51V4400CSJ-60
    ^-------------- V = 3,3volt / (blank) = 5volt
TC51V4400CSJ-60
     ^------------- 4 = 4  Megabit chip
                    1 = 16 Megabit chip: See below Click here                    
TC51V4400CSJ-60
      ^^----------- 26 = 512 refresh
                    40 = ?? refresh (probably 1K)
TC51V4400CSJ-60
      ^^----------- Internal Organization: 
                    26 = 256K x 16
                    40 = 1Meg x 4 : check module size/banks
TC51V4400CSJ-60
        ^---------- 0 = Fast Page
                    5 = EDO
TC51V4400CSJ-60
             ^^---- Speed: 50=50ns / 60=60ns / 70=70ns

Toshiba (TC) - 16/64 Megabit

How do I read the type number?

TC51V17400CSJ-60
^^^---------------- TC5 = Hitachi Memory
TC51V17400CSJ-60
    ^-------------- V = 3,3volt / (blank) = 5volt
TC51V17400CSJ-60
     ^------------- 1 = 16 Megabit chip
                    6 = 64 Megabit chip
                    4 = 4  Megabit chip: See above Click here
                    8 = SRAM chip: See below Click here
TC51V17400CSJ-60
      ^------------ 8 = 1K refresh
                    7 = 2K refresh
                    6 = 4K refresh
TC51V17400CSJ-60
       ^^---------- 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
TC51V17400CSJ-60
         ^--------- 0 = Fast Page
                    5 = EDO
TC51V17400CSJ-60
              ^^--- Speed: 50=50ns / 60=60ns / 70=70ns

Toshiba (TC) - SDRAM

How do I read the type number?

TC59S1608AFT-10
^^^---------------- TC5 = Hitachi Memory
TC59S1608AFT-10
    ^-------------- S = 3,3volt SDRAM
TC59S1608AFT-10
     ^^------------ 16 = 16 Megabit chip SDRAM
                    64 = 64 Megabit chip SDRAM
                    4 = 4  Megabit chip: See above Click here
                    8 = SRAM chip: See below Click here
                    M7 = 128 Megabit chip SDRAM
                    M8 = 256 Megabit chip SDRAM
TC59S1608AFT-10
     ^^^^---------- Internal Organization: 
                    1604 = 2Meg x 2 x 4 :  check module size/banks
                    1608 = 1Meg x 2 x 8 :  check module size/banks
                    1616 = 512K x 2 x 16 : check module size/banks
                    1632 = 256K x 2 x 32 : check module size/banks
                    6408 = 4Meg x 2 x 8 :  check module size/banks
                    M816 = 16Meg x 16   :  check module size/banks
TC59S1608AFT-10
         ^^^------- ????
TC59S1608AFT-10
             ^^---- Speed: 75=7.5ns / 8=8ns / 10=10ns / 12=12ns

Toshiba (TC) - (Pseudo?) Static RAM

How do I read the type number?

TC518512AFT-80V
^^^---------------- TC5 = Hitachi Memory
TC518512AFT-80V
    ^-------------- 8 = SRAM chip
                    1 = 16 Megabit chip: See above Click here
                    4 = 4  Megabit chip: See above Click here
TC518512AFT-80V
     ^^^----------- 512 = 512KB SRAM chip
TC518512AFT-80V
            ^^----- Speed: 50=50ns / 60=60ns / 70=70ns / etc

Toshiba (TC) - Video RAM (VRAM)

How do I read the type number?

TC528257J-70
^^^---------------- TC5 = Hitachi Memory
TC528257J-70
   ^--------------- 2 = VRAM
TC528257J-70
    ^^^^----------- 8257 = 256KB VRAM chip
TC528257J-70
          ^^------- Speed: 50=50ns / 60=60ns / 70=70ns / etc