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1-Wire SHA-1 Authenticator

Provides Low-Cost, World-Class Authentication Security to Protect Your Development Investment

Product Details

Key Features

Parametric specs for Secure Authenticators
Crypto Engine Symmetric
Bus Type 1-Wire
Memory Type EPROM
Memory Size 28 Bytes
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/3
TSOC/6
Budgetary
Price (See Notes)
0.68
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Simplified Block Diagram

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Parameters

Parametric specs for Secure Authenticators
Crypto Engine Symmetric
Bus Type 1-Wire
Memory Type EPROM
Memory Size 28 Bytes
Oper. Temp. (°C) -40 to +85
Package/Pins SOT23/3
TSOC/6
Budgetary
Price (See Notes)
0.68

Key Features

  • Dedicated Hardware-Accelerated SHA-1 Engine for Generating SHA-1 MACs
  • One Page of 28-Byte User OTP EPROM
  • Irreversible Write Protection
  • Unique Factory-Programmed 64-Bit Identification Number
  • 1-Wire Interface for Standard and Overdrive Speeds
  • Communicates with Host at Up to 15.4kbps at Standard Speed or Up to 125kbps in Overdrive Mode
  • Operating Range from 2.8V to 3.6V, -40°C to +85°C
  • 3-Lead SOT23 and 6-Lead TSOC Packages
  • ±6kV Human Body Model (HBM) ESD Protection (typ) on the 1-Wire and VCC Pin

Applications/Uses

  • Reference Design License Management
  • Sensor/Accessory Authentication and Calibration
  • System Intellectual Property Protection

Description

The DS28E10 combines secure challenge-and-response authentication functionality based on the FIPS 180-3 specified Secure Hash Algorithm (SHA-1) with 224 bits of one-time programmable user EPROM in a single chip. Once written, the memory is automatically write protected. Additionally, each device has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. Memory writes are performed 4 bytes at a time. A secure and low-cost factory programming service is available to preprogram device data, including the SHA-1 security data components. The device communicates over the single-contact 1-Wire® bus. The communication follows the standard 1-Wire protocol with the ROM ID acting as node address in the case of a multidevice 1-Wire network.

Simplified Block Diagram

DS28E10: Typical Operating Circuit DS28E10: 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 .