SLE5542 Secure Smart Card 5 Pack

Infineon SLE5542 Secure Smart Card

Infineon SLE5542 based blank white cards, that contain 256 x 8 bits of EEPROM main memory and a 32 x 1 bit protection PROM memory. Completely backward compatible to IS23SC4442 / SLE4442 based cards, but with added security.

The main memory can be randomly accessed byte by byte. During memory erase, all 8 bits of a byte are set to logical one. During memory write, individual bit(s) are set to logical zeros depend on the data value to be written. Normally, a data change will consist of an erase and a write operation. The write or erase operation each takes at least 2.5 ms to complete. The first 32 bytes (Address: 0 to 31) in memory are irreversibly protected by the corresponding 32 protect bits in the 32 x 1 bit protection memory. The 32 protect bits are one-time programmable, and they cannot be erased once they are set to logical zero. The SLE5542 smart card has a 3-bit Error Counter (EC), and three bytes Programmable Security Code (PSC) to prevent unauthorized erase/write operation to the memory. All the memory, except the PSC, can be read after the chip is powered up.

However, the memory can be written or erased only after the PSC is entered and verified to be correct. After three successive unsuccessful attempts at verifying the PSC, the Error Counter locks the chip from any further attempts, and the memory can never be erased or written.

This is a pack of 5 cards