The MAX66040 is a secure memory that complies with the ISO/IEC 14443 Type B standard. It combines 1024 bits of user EEPROM, SHA-1 challenge-and-response authentication, a 64-bit unique identifier (UID), and a 13.56MHz RF interface. The memory is organized into 16 blocks of 8 bytes, with one block for the secret key and two blocks for data and control registers. The integrated SHA-1 engine provides a message authentication code (MAC) using data from the EEPROM and the 64-bit secret key, ensuring secure symmetric authentication for reading and writing to the device. Memory protection features include write protection and EPROM emulation, which can be set for each individual memory page.
The MAX66040 is a secure memory chip that combines 1024 bits of user EEPROM, a 64‑bit UID, a 64‑bit secret, and a 512‑bit SHA‑1 engine in a single package. It communicates via a 13.56 MHz RF interface compliant with ISO/IEC 14443 Type B and supports block‑level read/write operations with optional write‑cycle counters and EPROM‑emulation protection.
Key features include up to 847.5 kbps data rate, 200 k write/erase cycles, 40‑year data retention, and support for AFI and CID functions. The device is powered parasitically from the RF field and includes a unique manufacturer code (0x2B) identifying Maxim as the chip maker.
| User EEPROM size | 1024 bits |
|---|---|
| SHA‑1 engine size | 512 bits |
| UID size | 64 bits |
| Operating temperature range | -25 °C to +50 °C |
| Maximum data rate | 847.5 kbps |
| Write/Erase cycles (minimum) | 200,000 cycles |
| Data retention (minimum) | 40 years |
| Carrier frequency | 13.56 MHz |
The chip provides 1024 bits of user EEPROM organized as 16 blocks of 8 bytes plus additional blocks for control and secret data.
It is a passive RFID device that harvests energy from the surrounding 13.56 MHz RF field; a minimum field strength is required as specified in the electrical characteristics.
The device can communicate at data rates up to 847.5 kbps.