View st1331-36 datasheet:

ST1331, ST1333 ST1335, ST1336 Memory Card IC 272 bit High Endurance EEPROM With Advanced Security Mechanisms DATA BRIEFING Single Supply Voltage (5 V) Memory Divided into: – 16 bits of Chip Identification – 48 bits of Card Identification – 40 bits of Count Data – 16 bits for Validation Certificate – 24 bits of Transport Code – 64 bits of Authentication Secret Key (ST1333/ 35) / Issuer Data (ST1331/36) – 32 bits of Anti-tearing Flags (option) Micromodule (D10) Micromodule (D15) – 56 bits of User Data (option: not erasable) Counting Capability (two options) – up to 32767 (85 -1) – 8 times Reloadable, up to 4095 (84-1) Certificate for Card Validation Advanced Authentication Function (ST1333/35) Special Anti-Tearing Mechanism Circuit Protected by Transport Code fo