SLE 7736 C

Overview

The Infineon SLE 7736 C is a security-focused intelligent EEPROM counter IC designed for prepaid applications. It features 221 bits of EEPROM and 16 bits of mask-programmable ROM, including a 40-bit counter area supporting up to 33,352 count units with anti-tearing protection. The device integrates high-security authentication logic using challenge-response mechanisms and includes a Card-Trash mechanism for physical devaluation. Operating at 5 V ± 10%, it complies with ISO/IEC 7816 standards and offers ESD protection of 4000 V typical.

Feature Summary

• Intelligent 221-bit EEPROM and 16-bit mask-programmable ROM with dedicated identification, counter, and data areas.
• High-security authentication unit supporting individual secret keys (Key 1 and optional Key 2) with cipher block chaining.
• Counter tearing protection via backup flags and a Card-Trash mechanism for physical function blocking.
• ISO/IEC 7816 compliant synchronous interface with 5 V supply voltage and 4000 V typical ESD protection.

Applications

• Prepaid telephone cards
• Pay TV systems

Procurement Notes

Verify the specific suffix 'C' indicates the die configuration rather than the wire-bonded module 'M3'. Confirm that the enabled counter tearing protection aligns with system requirements, as this feature can be disabled via mask option if necessary. Ensure terminal acceptance testing is performed due to potential electrical characteristic differences from legacy NMOS technologies.

Selection Notes

Select the SLE 7736 C over the SLE 7736E variant when the third byte of manufacturer data must be programmed exclusively by Infineon during manufacturing rather than by the card issuer during personalization. This model supports a maximum of 21,064 guaranteed count units for testing purposes, though the hardware supports up to 33,352 units. Ensure the application utilizes the 5 V ± 10% supply range compatible with Class A specifications.

Part Context

The SLE 7736 C belongs to the Eurochip Family and maintains functional compatibility with the SLE 5536S/36SE series while incorporating advanced IMEM technology for enhanced security against physical and electrical signal analysis. It serves as an upgrade path from older NMOS-based security chips, offering superior endurance and data retention characteristics suitable for high-volume prepaid metering applications.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Migration from legacy NMOS devices requires terminal acceptance testing due to differences in power consumption and electrical characteristics.