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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

Product Details

Key Features

Simplified Block Diagram

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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

Applications/Uses

  • 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

Description

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.

Simplified Block Diagram

DS28CN01: Typical Operating Circuit DS28CN01: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .