DS28E25P+

Specialized ICS Overview

The DS28E25P+ is a DeepCover Secure Authenticator featuring a symmetric key-based bidirectional authentication model using the FIPS 180-3 SHA-256 algorithm. It integrates a dedicated hardware-accelerated SHA engine for generating message authentication codes (MACs) and provides 4Kb of user-programmable EEPROM partitioned into 16 pages. The device includes a unique factory-programmed 64-bit ROM ID used as a cryptographic input and electronic serial number. It communicates via a single-contact 1-Wire interface at speeds up to 76.9kbps. Electrical specifications include an operating voltage range of 2.97V to 3.63V, an operating temperature range of -40°C to +85°C, and typical standby power consumption of 5µA.

Specialized ICS Feature Summary

• Bidirectional secure challenge-and-response authentication based on SHA-256
• 4096 bits of user EEPROM with irreversible protection modes (OTP/EPROM emulation)
• Unique 64-bit factory-programmed ROM identification number
• Single-contact 1-Wire interface supporting overdrive speed up to 76.9kbps

Specialized ICS Applications

• Authentication of network-attached appliances
• Printer cartridge identification and authentication
• System intellectual property protection
• Sensor and accessory authentication and calibration
• Secure feature setting for configurable systems

Specialized ICS Procurement Notes

Verify package configuration against ordering information; the 'P' suffix indicates a 6-pin TSOC package. Confirm RoHS compliance status via the '+' suffix designation. Check full datasheet availability for detailed timing parameters and programming endurance limits not fully specified in abridged documentation.

Specialized ICS Selection Notes

Select this component when SHA-256 based mutual authentication is required alongside nonvolatile data storage. Ensure system design accommodates the 1-Wire bus pullup requirements and voltage levels between 2.97V and 3.63V. Consider the 6-pin TSOC package constraints for PCB layout and thermal management during soldering operations.

Specialized ICS Part Context

The DS28E25P+ belongs to the DS28E25 series of DeepCover Secure Authenticators manufactured by Analog Devices (formerly Maxim Integrated). This series focuses on embedding security into devices using physical security layers and cryptographic algorithms. The P variant specifically denotes the surface-mount TSOC package option within the broader family that also includes SFN, TO-92, and TDFN packages.

Specialized ICS Replacement Considerations

Compatible alternatives within the same family include DS28E25G+ (SFN package), DS28E25+ (TO-92 package), and DS28E25Q+T (TDFN-EP package). These variants share identical electrical and functional specifications but differ in physical footprint and mounting method.