The main features of the SLE5542/SLE4442 are:
- SLE 5542 , Intelligent 256-Byte EEPROM with Write Protection function and Programmable Security Code

• SLE 5542 replaces SLE 4442
• SLE 5542 is 100% functional compatible to SLE 4442
• 256 x 8-bit EEPROM organization of Data Memory
• 32 x 1-bit Protection Memory
  1. Byte-wise write protection of first 32 addresses (byte 0....31) of Data Memory
  2. Manufacturer Code for unique identification of application
• Data Memory (addresses 0....255) alterable only after verification of 3 Byte Programmable Security Code (PSC)
• Advanced CMOS-technology optimised for security layout

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The main features of the SLE5528/4428 are:
- Synchronous communication protocol, ISO 7816 compatible

• 100% functional compatibility to SLE 5528/4428
• 1024 x 8 bit EEPROM organization of Data Memory
• 1024 x 1 bit Protection Memory
• Byte-wise write protection of Data Memory (one time programmable)
• Not alterable Manufacturer Code (chip coding and unique coding by application identifier

  RID according to ISO/IEC 7816-5)

• Data Memory alterable only after verification of 2 Byte PSC
• PSC verification trials limited by Error Counter
• Serial synchronous three-wire link protocol according to ISO/IEC 7816
• Byte-wise addressing
• End of processing indicated at data output
• Contact configuration and Answer-to-Reset (synchronous transmission) in accordance to standard ISO/IEC 7816