DS28E02 - Maxim Integrated Products

DS28E02 1-Wire SHA-1 Authenticator 1Kb EEPROM

The DS28E02 combines 1024 bits of EEPROM with challenge-and-response authentication security implemented with the FIPS 180-3 Secure Hash Algorithm (SHA-1). The 1024-bit EEPROM array is configured as four pages of 256 bits with a 64-bit scratchpad to perform write operations. All memory pages can be write protected, and one page can be put in EPROM-emulation .

Features

♦ 1024 Bits of EEPROM Memory Partitioned Into Four Pages of 256 Bits ♦ On-Chip 512-Bit SHA-1 Engine to Compute 160Bit Message Authentication Codes (MACs) and to Generate Secrets ♦ Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization ♦ User-Programmable Page Write Protection for Page 0, Page 3, or All Four Pages Together ♦ User-Programmable OTP EPROM Emulation Mode for Page 1 (“Write to 0”) ♦ Communicates to Host with a Single Digital Signal at 12.5kbps or 35.7kbps Using 1-Wire Protocol ♦ Switchpoint Hysteresis and Filteri.