Overview

Features and Benefits

  • Robust Countermeasures Protect Against Security Attacks
    • Patented Physically Unclonable Function Secures Device Data
    • Actively Monitored Die Shield Detects and Reacts to Intrusion Attempts
    • All Stored Data Cryptographically Protected from Discovery
  • Efficient Secure Hash Algorithm Authenticates and Manages Peripherals
    • FIPS 202-Compliant SHA-3 Algorithm for Bidirectional Authentication
    • FIPS 198-Compliant Keyed-Hash Message Authentication Code (HMAC)
    • TRNG with NIST SP 800-90B Compliant Entropy Source
  • Supplemental Features Enable Easy Integration into End Applications
    • 2Kb of EEPROM for User Data, Key, and Control Registers
    • One Open-Drain GPIO Pin
    • Unique and Unalterable Factory Programmed 64-Bit Identification Number (ROM ID)
    • Large 1-Wire Block Buffer (126 bytes) for Efficient Data Transfer
    • 1-Wire Standard and Overdrive Timing Communication Speeds
    • I²C Communication, Up to 1MHz
    • Operating Range: 3.3V ±10%, -40°C to +85°C
    • 6-Pin TDFN-EP Package (3mm x 3mm)

Product Details

The DS2477 secure I²C coprocessor with built-in 1-Wire® master combines FIPS202-compliant secure hash algorithm (SHA-3) challenge and response authentication with Maxim’s patented ChipDNA™ feature, a physically unclonable technology (PUF) to provide a cost-effective solution with the ultimate protection against security attacks. The ChipDNA implementation utilizes the random variation of semiconductor device characteristics that naturally occur during wafer fabrication. The ChipDNA circuit generates a unique output value that is repeatable over time, temperature, and operating voltage. Attempts to probe or observe ChipDNA operation modifies the underlying circuit characteristics thus preventing discovery of the unique value used by the chip cryptographic functions. The DS2477 utilizes the ChipDNA output as key content to cryptographically secure all device-stored data. With ChipDNA capability, the device provides a core set of cryptographic tools derived from integrated blocks including a SHA-3 engine, a FIPS/NIST compliant true random number generator (TRNG), 2Kb of secured EEPROM, and a unique 64-bit ROM identification number (ROM ID). The unique ROM ID is used as a fundamental input parameter for cryptographic operations and serves as an electronic serial number within the application. The DS2477 provides the SHA-3 and memory functionality required by a host system to communicate with and operate a 1-Wire SHA-3 slave. In addition, it performs protocol conversion between the I²C master and any attached 1-Wire SHA-3 slaves. For 1-Wire line driving, internal user-adjustable timers relieve the system host processor from generating time-critical 1-Wire waveforms, supporting both standard and overdrive 1-Wire communication speeds. The 1-Wire line can be powered down under software control. Strong pullup features support 1-Wire power delivery for commands that require higher current consumption.

Applications

  • Authentication of Medical Sensors and Tools
  • IoT Node Authentication
  • Peripheral Authentication
  • Printer Cartridge Identification and Authentication
  • Reference Design License Management
  • Secure Management of Limited Use Consumables

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (4)

Tools & Simulations

Software Development

Reference Designs (1)

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.