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IS
ISSI
XX
Family Descriptor
89 = 8-bit Microcontroller
X
Technology
C = CMOSE = Enhanced FunctionsLV = Low-Voltage
XX
Device Number
51 = Microcontroller with 4kx8 FLASH52 = Microcontroller with 8kx8 FLASH54 = Microcontroller with 16kx8 FLASH58 = Microcontroller with 32kx8 FLASH64 = Microcontroller with 64kx8 FLASH
X
Version
XX
Speed Option
12 = 12 MHz24 = 24 MHz40 = 40 MHz
XX
Package Type
PL = PLCCW = 600mil Plastic DIPPQ = PQFP
X
Temperature Range
Blank = CommercialI = Industrial
Note: Part number description table describes usual part-numbering system for more chips, therefore this table can contain information, that might not be valid for the actually selected chip. The information here are provided on the best-effort basis and might be either inaccurate or incoplete. Therefore always check the latest datasheet of the chip for part number description detail. If you find some inaccuracy, let us please know.