DS28E22P+T

Specialized ICS Overview

The DS28E22P+T is a DeepCover Secure Authenticator integrating SHA-256 cryptographic capabilities with 2Kb of user-programmable EEPROM. It operates on the 1-Wire bus at overdrive speeds up to 76.9kbps, utilizing a single-contact interface powered by a pullup voltage between 2.97V and 3.63V. The device features a unique factory-programmed 64-bit ROM ID for authentication inputs. Electrical characteristics include a typical standby current of 5µA, programming currents of 1mA for EEPROM segments and 1mA for SHA-256 computation, and data retention of 10 years at +85°C.

Specialized ICS Feature Summary

• Symmetric key-based bidirectional secure authentication model based on FIPS 180-3 SHA-256
• 2048 bits of user EEPROM partitioned into 8 pages of 256 bits with irreversible protection modes
• Dedicated hardware-accelerated SHA engine generating MACs from user memory, secrets, challenges, and ROM ID
• Unique 64-bit identification number used as node address in multi-device networks

Specialized ICS Applications

• Authentication of network-attached appliances
• Printer cartridge ID and authentication
• Sensor and accessory authentication and calibration
• Secure feature setting for configurable systems
• Key generation and exchange for cryptographic systems

Specialized ICS Procurement Notes

Verify the package type matches the design requirements, as the DS28E22 series includes both TSOC and TDFN options. Confirm that the system power supply remains within the 2.97V to 3.63V range to ensure proper 1-Wire communication and internal voltage regulation. Ensure the external pullup resistor value allows for the specified recovery times and bit rates.

Specialized ICS Selection Notes

Select the DS28E22P+T when a 6-pin TSOC surface-mount package is required for the application. Compare against the DS28E22Q+T if a TDFN package with an exposed pad is preferred for thermal management or board space constraints. Both variants share identical electrical specifications and functionality; the choice depends solely on mechanical footprint availability.

Specialized ICS Part Context

The DS28E22P+T belongs to the DS28E22 family of DeepCover Secure Authenticators. It shares core cryptographic and memory features with other members like the DS28E25 and DS28E11 but differs in package configuration. The 'P' suffix specifically denotes the 6-lead TSOC package, while the '+T' indicates lead-free/RoHS compliance and tape-and-reel packaging.

Specialized ICS Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. The DS28E22Q+T serves as a pin-compatible alternative only if the TDFN package is acceptable. No other cross-model replacements are explicitly listed.