The main features of the SLE4442 are: - Synchronous communication protocol, ISO 7816 compatible - EEPROM size is 256 bytes split into the following areas: 26 bytes for card manufacturer data 2 bytes for card issuer reference 4 bytes for card identification data 224 bytes for main user data - Access to the memory is protected by a 3 byte secret code for data write only - Free Read of Data (except PIN) - Answer to reset according to ISO 7816/3 standard - Data retention is up to 10 years - Non reversible byte-wise write protection of lowest 32 addresses