SLE 4432 M3.2

Application Specific Microcontrollers Overview

The Infineon SLE 4432 M3.2 is an intelligent 256-byte EEPROM designed for chip card applications, operating via a two-wire synchronous link protocol compliant with ISO standard 7816. It features byte-wise addressing and irreversible write protection for the lowest 32 addresses using a 32-bit PROM-based protection memory. The device supports a minimum of 10^4 write/erase cycles and retains data for at least ten years. Programming time is 2.5 ms per byte. The M3.2 suffix denotes the specific wire-bonded module package configuration.

Application Specific Microcontrollers Feature Summary

• 256 x 8-bit EEPROM main memory with byte-wise addressing
• Irreversible write protection for bytes 0-31 via 32-bit PROM protection memory
• Two-wire synchronous interface compliant with ISO 7816-3
• 2.5 ms programming time per byte for erase and write operations

Application Specific Microcontrollers Applications

• Smart cards requiring secure data storage
• Identification systems with write-protected memory segments
• Chip card embedding in plastic cards

Application Specific Microcontrollers Procurement Notes

Verify the M3.2 ordering suffix against current Infineon documentation to confirm package availability and specifications. As this component originates from Siemens Semiconductor Group (now part of Infineon), ensure compatibility with legacy system requirements. Contact authorized distributors for current supply status as older revisions may have limited availability.

Application Specific Microcontrollers Selection Notes

Select the SLE 4432 when only basic write protection for the first 32 bytes is required. If programmable security code verification is needed for all memory accesses, consider the SLE 4442 variant instead. Ensure the application supports the synchronous two-wire protocol and provides necessary pull-up resistors for the I/O line.

Application Specific Microcontrollers Part Context

The SLE 4432 belongs to the SLE 44xx family of intelligent EEPROMs originally published by Siemens AG in 1995. The M3.2 designation refers to the wire-bonded module form factor suitable for embedding in plastic cards, distinct from the bare die (C) or other module variants like M2.2.

Application Specific Microcontrollers Replacement Considerations

Publicly confirmed direct substitute part numbers are not available in the provided source material. Evaluate the SLE 4442 if additional security logic is acceptable, or consult Infineon for updated equivalents within the SLE 44xx series.