Maxim Integrated Products introduces the DS28CN01, a new highly integrated secure memory device. The DS28CN01 provides bidirectional challenge-and-response authentication protection by using the internationally recognized SHA-1 (Secure Hash Algorithm) cryptographic algorithm. A 1kb EEPROM array and associated command set ensure tamper-proof storage of data written to the integrated nonvolatile 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 ideal 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; and 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 serialization 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, 400kHz I2C/SMBus(TM)-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 1.8V to 5V over the -40 degrees Celsius to +85 degrees Celsius industrial temperature range. This device is packaged in an 8-pin microSOP.
Maxim Integrated Products
