DS28E25G+U

Specialized ICS Overview

The DS28E25G+U is a DeepCover Secure Authenticator featuring a single-contact 1-Wire interface and SHA-256 cryptographic engine. It integrates 4Kb of user-programmable EEPROM for nonvolatile data storage alongside protected memory for secrets and configuration settings. The device utilizes a unique factory-programmed 64-bit ROM ID as a fundamental input for bidirectional authentication, enabling secure challenge-and-response protocols between host systems and the authenticator. Operating within a voltage range of 2.97V to 3.63V and a temperature range of -40°C to +85°C, it supports overdrive speeds up to 76.9kbps.

Specialized ICS Feature Summary

• Symmetric key-based bidirectional secure authentication model based on FIPS 180-3 SHA-256
• Dedicated hardware-accelerated SHA engine generating SHA-256 MACs in approximately 3ms
• 4096 bits of user EEPROM partitioned into 16 pages of 256 bits with irreversible protection modes
• Unique, factory-programmed 64-bit identification number (ROM ID) for cryptographic operations

Specialized ICS Applications

• Authentication of network-attached appliances
• Printer cartridge identification and authentication
• Reference design license management
• System intellectual property protection
• Sensor and accessory authentication and calibration

Specialized ICS Procurement Notes

Verify the specific package suffix against the ordering information table. The 'G' suffix corresponds to the SFN package type. Confirm RoHS compliance status indicated by the '+' symbol. Ensure the source documentation matches the requested revision level for accurate electrical characteristics and timing parameters.

Specialized ICS Selection Notes

Select this component when bidirectional SHA-256 authentication is required for peripheral validation. The 4Kb EEPROM capacity suits applications needing moderate nonvolatile storage for application data or certificates. Consider the SFN package availability if electro-mechanical contact attachment is preferred over soldering. Verify system pullup resistor requirements against the specified 300Ω to 1500Ω range.

Specialized ICS Part Context

The DS28E25 belongs to the DeepCover Secure Authenticator family from Analog Devices/Maxim Integrated. This series combines embedded security solutions with physical security layers to protect sensitive data. The DS28E25 specifically focuses on symmetric key authentication using SHA-256, distinguishing itself from other family members that may utilize asymmetric algorithms like ECDSA.

Specialized ICS Replacement Considerations

Consult the official datasheet for direct pin-compatible alternatives within the same package style. Cross-model substitution requires verification of cryptographic algorithm compatibility and EEPROM size constraints.