Detailed Product Description

FM4442 - 256 Bytes Memory Card Chip

Description:

  FM4442 is the memory card chip. This chip uses 0.6µm CMOS EEPROM process, has 256×8 Bits EEPROM with write protect fuction and programmable security code. With its contact configuration in accordance to ISO standard 7816 (sychronous transmission), FM4442 can be widely used in different types of IC menory cards.

Features:

  256×8-bits EEPROM organization

  Byte-wise addressing

  Irreversible byte-wise write protection

  Irreversible byte-wise write protection of lowest 32 addresses (Byte 0 ... 31)

  Minimum of 100000 write/erase cycles

  Data retention for minimum of ten years

  Contact configuration and serial interface in accordance with ISO standard 7816 (synchronous transmission)

  Only after entry of the correct 3Bytes programmable security code (PSC)

  Compatible SLE4442 

Function Description:

  The FM4442 consists of 256 x 8 bits EEPROM main memory and a 32-bit protection memory with PROM functionality. The main memory is erased and written byte by byte. Each of the first 32 bytes can be irreversibly protected against data change by writing the corresponding bit in the protection memory. Each data byte in this address range is assigned to one bit of the protection memory and has the same address as the data byte in the main memory which it is assigned to. Once written the protection bit cannot be erased (PROM).