DS28E25+T

Specialized ICS Overview

The DS28E25+T is a DeepCover Secure Authenticator integrating SHA-256 cryptographic authentication with 4Kb user EEPROM. It employs a bidirectional security model using FIPS 180-3 compliant algorithms, generating MACs from user data, an on-chip secret, host challenges, and a unique 64-bit ROM ID. The device communicates via a single-contact 1-Wire bus at up to 76.9kbps. Electrical specifications include a pullup voltage range of 2.97V to 3.63V, standby current of 5µA, and programming currents of 1mA for both EEPROM and SHA-256 operations.

Specialized ICS Feature Summary

• Symmetric key-based bidirectional secure authentication model based on SHA-256
• Dedicated hardware-accelerated SHA engine for generating SHA-256 MACs
• 4096 bits of user EEPROM partitioned into 16 pages of 256 bits
• Unique, factory-programmed 64-bit identification number (ROM ID)

Specialized ICS Applications

• Authentication of Network-Attached Appliances
• Printer Cartridge ID/Authentication
• Reference Design License Management
• System Intellectual Property Protection

Specialized ICS Procurement Notes

Verify the 'T' suffix indicates tape-and-reel packaging configuration. Confirm RoHS compliance status associated with the '+' designation. Ensure the specific package variant matches the required form factor, as the base part number supports multiple packages including SFN, TO-92, TSOC, and TDFN.

Specialized ICS Selection Notes

Select this component when bidirectional SHA-256 authentication and nonvolatile storage are required. The 4Kb EEPROM capacity suits applications needing moderate data retention alongside cryptographic verification. Verify that the system can support the 1-Wire protocol timing requirements and provides adequate pullup resistance within the specified voltage range.

Specialized ICS Part Context

The DS28E25 belongs to the Analog Devices DeepCover family of embedded security solutions. These devices combine physical security layers with cryptographic functions to protect sensitive keys and data. The '+T' designation specifically identifies the tape-and-reel packaging option for automated assembly processes.

Specialized ICS Replacement Considerations

DS28E25G+T: Same functionality in SFN package. DS28E25P+T: Same functionality in TSOC package. DS28E25Q+T: Same functionality in TDFN-EP package.