Fudan 4442 Contact Smart Card

Description

Key Technical Features:

Storage Structure:
256-byte EEPROM Main Storage Area: Supports byte-level read and write operations.
32-bit Protection Bit Area: Each bit corresponds to one of the first 32 bytes of the main storage area; once set, it imposes permanent write protection, rendering the data unalterable.
4-byte Confidential Storage Area: Contains a 3-byte user password and a 1-byte error counter.

Security Mechanisms:
3-Byte User Password: The initial limit for incorrect attempts is set to 3. Once this limit is reached, the card automatically locks down, permitting read operations only while prohibiting any modifications.
Write operations are enabled only after successful password verification; the password itself may also be modified during the current session (changes are reset upon power loss).

Electrical and Durability Parameters:
Operating Voltage: 5V
Max. Supply Current: 10mA
Erase/Write Endurance: ≥100,000 cycles
Data Retention: ≥10 years
Temperature Range: -30°C to 70°C (0°C to 70°C for select models)

Communication Interface:
Compliant with the ISO/IEC 7816-3 standard, it employs a synchronous transmission mode and communicates with read/write devices via physical contacts.

Process and Compatibility:
Utilises a 0.6-micron CMOS EEPROM process.
Fully compatible with chips such as Siemens SLE4442, SLE5542, and Atmel AM5542, allowing for mutual interchangeability.