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SLE5542 secure card
Infineon SLE5542 based blank white card, contains 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 may consists of an erase and a write operation. The write or erase operation 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 onetime programmable, and they cannot be erased once they are set to logical zero.
SLE5542 provides 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 on. But, the memory can be written or erased only after the PSC is entered and verified correct. After three successive unsuccessful verifications of PSC, the Error Counter locks the chip from a further attempt, and the memory can never be erased or written.
This card is very suitable for high-volume applications (contact us for volume quotes).
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