The SLE5542 is a smart card IC that builds on the popular SLE4442, offering enhanced compatibility and security. Here are its key technical characteristics:

🧠 Memory & Security

• EEPROM Memory: 256 bytes (organized as 256 × 8 bits)
• Protection Memory: 32 × 1-bit for write protection
• Programmable Security Code (PSC): 3-byte PIN for write access
• Error Counter: Locks write access after 3 failed PSC attempts

🔐 Data Integrity & Reliability

• Anti-tearing mechanism: Protects data during power loss
• Write Endurance: 100,000 cycles
• Data Retention: Minimum 10 years

📡 Interface & Electrical

• Contact Interface: ISO/IEC 7816 compliant
• Communication Protocol: Asynchronous, T=0
• Operating Voltage: 5V ±10%
• Clock Frequency: Up to 5 MHz

🌡️ Environmental

• Operating Temperature: –25 °C to +85 °C

📏 Physical Format

• Typically embedded in ID-1 format cards (85.6 × 53.98 mm), made of PVC or composite materials

This chip is ideal for access control, loyalty programs, prepaid systems, and secure ID cards, especially where backward compatibility with SLE4442 is needed.