Products > Integrated Circuits (ICs) > Programmable Logic ICs > DS28E35
DS28E35 SOJ6
  • DS28E35
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DeepCover Secure Authenticator with 1-Wire ECDSA and 1Kb User EEPROM

Manufacturer :
Maxim Integrated
Package/Case :
Product Categories :
Secure Authenticators
RoHs Status:
Lead free/RoHS Compliant

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DS28E35 Product Details

The DeepCover Secure Authenticator (DS28E35) provides a highly secure solution for a host controller to authenticate peripherals based on the industry standard (FIPS 186) public-key based Elliptic Curve Digital Signature Algorithm (ECDSA). The ECDSA engine computes keys and signatures using a pseudorandom curve over a prime field according to the �Standards for Efficient Cryptography (SEC)�. The private and public key can be computed by the device or installed by the user and optionally locked. Separate memory space is set aside to store and lock a public-key certificate as it is needed to verify authenticity. In addition to ECDSA-related memory, the device has 1024 bits of user memory that is organized as four pages of 256 bits. Page protection modes include write protection, read protection, and one-time-programmable (OTP) memory emulation modes. The DS28E35 also features a one-time settable, nonvolatile 17-bit decrement-on-command counter, which can be used to keep track of the lifetime of the object to which the DS28E35 is attached. Each device has its own guaranteed unique 64-bit ROM identification number (ROM ID) that is factory programmed into the chip. This unique ROM ID is used as a fundamental input parameter for cryptographic operations and also serves as an electronic serial number within the application. The DS28E35 communicates over the single-contact 1-Wire� bus at overdrive speed. The communication follows the 1-Wire protocol with the ROM ID acting as node address in the case of a multi-device 1-Wire network.


  • Symmetric Key-Based Bidirectional Secure Authentication and Encryption Model Based on SHA-256
  • Dedicated Hardware-Accelerated SHA Engine for Generating SHA-256 MACs
  • Strong Authentication with a 256-Bit, User-Programmable Secret, and Input Challenge
  • 3072 Bits of User EEPROM Partitioned Into 12 Pages of 256 Bits
  • User-Programmable and Irreversible EEPROM Protection Modes Including Authentication, Write and Read Protect, Encryptions, and OTP/EPROM Emulation
  • Supports 100kHz and 400kHz I2C Communication Speeds
  • Supports Power-Saving Sleep Mode at 0.5μA (typ)
  • Operating Range: 3.3V ±10%, -40°C to +85°C
  • 8-Pin TDFN Package


  • Authentication of Network-Attached Appliances
  • Key Generation and Secure Exchange for Cryptographic Systems
  • Secure Feature Setting for Configurable Systems
  • System Intellectual Property Protection

DS28E35 Block Diagram
(Picture: Diagram)

Technical Parameters

Crypto Engine Asymmetric Deep Cover Yes
Applications IP Protection ,Medical Consumable ID ,PCB ID and Authentication ,Print Cartridge Authentication ,Rack Card Security Oper. Temp. (\u00b0C) -40 to +85
Memory Type EEPROM Package/Pins SFN/2 ,TDFN/8 ,TO92/3 ,TSOC/6
Memory Size 1K x 1 Smallest Available Pckg. (max w/pins) (mm2) 17.8
Bus Type 1-Wire RoHS Available Yes
Features Certificate ,Decrement Counter ,ECDSA Authentication ,Memory Protection Options ,Serial Number Budgetary Price (See Notes) $1.04 @1k
Vsupply (V) 2.97 to 3.63

DS28E35 Related Products

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  • **avid Fri***

    alles ok. schnelle lieferung!!

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