Maxim has introduced the DS28CN01, a new highly integrated secure memory device. The DS28CN01 provides bidirectional challenge-and-response authentication protection by using the internationally recognised SHA-1 (secure hash algorithm) cryptographic algorithm. A 1 Kbit EEPROM array and associated command set ensure tamper-proof storage of data written to the integrated non-volatile data array. Each EEPROM page is protected against data modification by the SHA-1 algorithm, and also includes programmable write protection and EPROM/OTP (one-time-programmable) emulation modes.
The DS28CN01 is suitable for a broad range of cost-sensitive end equipment in which intellectual property needs to be protected and/or equipment features need to be securely controlled, such as network routers/switches, notebook PC battery packs, laser and inkjet printer cartridges and GPS navigators. Within such applications, the DS28CN01 is used for managing reference designs, protecting intellectual property, securing system settings, tracking the expiration of consumables, as well as authenticating systems, board-level designs, accessories and peripherals.
Every DS28CN01 has a guaranteed unique, factory-programmed, read-only memory (ROM), 64-bit ID number that can be used for a variety of system-level functions including unique electronic serialisation of equipment and network-node identification. The 64-bit ROM ID also serves as an integral element in the device's overall secure functionality as a dynamic variable within the SHA-1 computation.
Communication with the DS28CN01 is accomplished through an industry-standard, 400 kHz I C/SMBus-compatible interface that includes a programmable bus timeout feature to reset the interface if a bus-lockup fault condition is detected. The DS28CN01 operates from 1,8 V to 5 V over the -40°C to +85°C industrial temperature range and is packaged in an 8-pin microSOP.
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