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Understanding RAM chip numbers: NEC

Link naar de fabrikant. Link to the manufacturer.

Sample Explanation
16 Mb Chip organised as: 4M x 4 bits
2K refresh, Extended Data Out (EDO)
Speed = 60ns, Supply = 3,3 Volt

NEC (MT) - 1 Megabit

How do I read the type number?

421000AA64FB-60
^^----------------- 42 = NEC DRAM
421000AA64FB-60
  ^^^^------------- Internal Organization & Refresh: 
                    1000 = 1Meg x 1  / ??  refresh : check module size/banks
                    4256 = 256K x 4  / ??  refresh
421000AA64FB-60
             ^^---- Speed: 50=50ns / 60=60ns / 70=70ns / etc

NEC (MT) - 4 Megabit

How do I read the type number?

42S4400GS-60
^^----------------- 42 = NEC DRAM
42S4400GS-60
  ^---------------- Power consumption:
                    S = low power / (blank) = normal
42S4400GS-60
   ^--------------- 4 = 4  Megabit chip
                    1 = 16 Megabit chip: see below
42S4400GS-60
    ^^^------------ Internal Organization & Refresh: 
                    100 = 4Meg x 1  / ??  refresh
                    260 = 256K x 16 / 512 refresh
                    400 = 1Meg x 4  / 1K  refresh : check module size/banks
                    800 = 512K x 8  / 1K  refresh
42S4400GS-60
      ^------------ 0 = Fast Page
42S4400GS-60
          ^^------- Speed: 50=50ns / 60=60ns / 70=70ns / etc

Link naar de fabrikant. Link to the manufacturer.

NEC (MT) - 16 Megabit

How do I read the type number?

42S18160-A60
^^----------------- 42 = NEC DRAM
                    48 = NEC CMOS Application Specific Memory
42S18160-A60
  ^---------------- Power consumption:
                    S = low power / (blank) = normal
42S18160-A60
   ^--------------- 1 = 16 Megabit chip
                    4 = 4  Megabit chip: see above
42S18160-A60
    ^-------------- 8 = 1K refresh
                    7 = 2K refresh
                    6 = 4K refresh
42S18160-A60
     ^^------------ 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
42S18160-A60
       ^----------- 0 = Fast Page
                    5 = EDO
42S18160-A60
         ^--------- A = 3,3volt / (blank) = 5volt
42S18160-A60
          ^^------- Speed: 50=50ns / 60=60ns / 70=70ns

Link naar de fabrikant. Link to the manufacturer.

NEC (MT) - Application Specific Memory

How to read the part number:

481850GF-A10
^^----------------- 48 = NEC CMOS Application Specific Memory
                    42 = NEC DRAM: see above
481850GF-A10
  ^---------------- 1 = Graphics RAM (SGRAM)
481850GF-A10
   ^--------------- 8 = 8 Megabit chip: check module size
481850GF-A10
    ^-------------- Words organisation:
                    5 = 32 bits wide
481850GF-A10
     ^------------- Function: 
                    0 = ?????
481850GF-A10
         ^--------- A = 3,3volt / (blank) = 5volt
481850GF-A10
          ^^------- Speed: 10=10ns / 12=12ns / 15=15ns

Link naar de fabrikant. Link to the manufacturer.