1Kbit I²C/SMBus EEPROM with SHA-1 Engine

Low-Cost, High-Security, SHA-1-Based Authentication Solution Provides Clone Prevention, IP Protection, and License Management

Please check latest availability status for a specific part variant.


The DS28CN01 combines 1024 bits of EEPROM with challenge-and-response authentication security implemented with the Federal Information Publications (FIPS) 180-1/180-2 and ISO/IEC 10118-3 Secure Hash Algorithm (SHA-1). The memory is organized as four pages of 32 bytes each. Data copy-protection and EPROM emulation features are supported for each memory page. Each DS28CN01 has a guaranteed unique factory-programmed 64-bit registration number. Communication with the DS28CN01 is accomplished through an industry standard I²C- and SMBus™-compatible interface. The SMBus timeout feature resets the device's interface if a bus-timeout fault condition is detected.
DS28CN01: Typical Operating Circuit DS28CN01: Typical Operating Circuit Enlarge+

Key Features

  • 1024 Bits of EEPROM Memory Partitioned Into Four Pages of 256 Bits
  • Dedicated Hardware-Accelerated SHA Engine for Generating SHA-1 MACs
  • EEPROM Memory Pages can be Individually Copy-Protected or Put Into an EPROM Mode (Program from 1 to 0 Only)
  • Write Access Requires Knowledge of the Secret and the Capability of Computing and Transmitting a 160-Bit MAC as Authorization
  • Unique, Factory-Programmed, and Tested 64-Bit Registration Number Assures Absolute Traceability Because No Two Parts are Alike
  • Endurance 200k Cycles at +25°C
  • Serial Interface User Programmable for I²C Bus and SMBus Compatibility
  • Supports 100kHz and 400kHz I²C Communication Speeds
  • 5.5V Tolerant Interface Pins
  • Operating Range: 1.62V to 5.5V, -40°C to +85°C
  • 8-Pin µSOP Package


  • Accessory and Peripheral Identification
  • Equipment Registration and License Management
  • Medical Sensor Authentication and Calibration
  • Network Node Identification
  • Printed Circuit Board Unique Serialization
  • Printer Cartridge Configuration and Monitoring
  • System Intellectual Property Protection

DSAUTHSK: Evaluation Kit for the DS28E01-100, DS28CN01, and DS2460

CAD Symbols and Footprints

  • DS28CN01U-A00+
  • DS28CN01U-A00+T
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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    Related Resources

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