DS2476BQ+T

Specialized ICS Overview

The DS2476BQ+T is a DeepCover secure coprocessor designed to complement the DS28C36 memory device. It integrates hardware engines for ECDSA P-256 and HMAC SHA-256 computations, supporting bidirectional asymmetric key authentication. The device includes an 8Kb secured EEPROM, a decrement-only counter, two configurable GPIO pins, and a unique 64-bit ROM ID. Communication occurs via I2C at speeds up to 1MHz. Operating voltage ranges from 2.2V to 3.63V within a -40°C to +85°C temperature range. It is housed in a 6-pin TDFN package with an exposed pad.

Specialized ICS Feature Summary

• ECC-256 Compute Engine: Supports FIPS 186 compliant ECDSA signature generation/verification and ECDH key exchange.
• SHA-256 Compute Engine: Provides FIPS 180 compliant HMAC functions and OTP encrypted R/W of configurable memory.
• Integrated Security Resources: Includes 8Kb secured EEPROM, a 17-bit decrement-only counter, NIST SP 800-90B compliant RNG, and a factory-programmed 64-bit ROM ID.
• Configurable GPIO: Two open-drain pins support authenticated/nonauthenticated operation and secure boot via ECDSA certificates.

Specialized ICS Applications

• IoT Node Crypto-Protection
• Accessory and Peripheral Secure Authentication
• Secure Storage of Cryptographic Keys for a Host Controller
• Secure Boot or Download of Firmware and/or System Parameters

Specialized ICS Procurement Notes

Verify the specific ordering suffix 'Q' corresponds to the tape and reel packaging configuration as indicated in the manufacturer's ordering information table. Confirm that the component meets RoHS compliance standards associated with the '+' designation. Ensure the supply voltage and I2C timing parameters align with the host system requirements before procurement.

Specialized ICS Selection Notes

Select the DS2476BQ+T when high-speed I2C communication up to 1MHz is required, distinguishing it from the standard DS2476 which supports up to 400kHz. Verify that the host system can accommodate the 2.2V to 3.63V operating voltage range. Ensure the application utilizes the companion DS28C36 memory if full cryptographic operations on stored data are intended.

Specialized ICS Part Context

The DS2476BQ+T belongs to the Maxim Integrated (now Analog Devices) DeepCover family of secure coprocessors. It is specifically engineered to work in tandem with the DS28C36 1-Wire EEPROM, providing the necessary cryptographic processing power to secure data stored in the companion memory device against physical and logical attacks.

Specialized ICS Replacement Considerations

The DS2476Q+T is a related variant within the same family but operates with a maximum I2C clock frequency of 400kHz, whereas the DS2476BQ+T supports up to 1MHz. Direct substitution requires verification that the lower speed of the DS2476Q+T meets the system's timing constraints.

Specialized ICS FAQ

What is the maximum I2C clock frequency for the DS2476BQ+T?

The DS2476BQ+T supports I2C communication at frequencies up to 1MHz.

How does the DS2476BQ+T handle input leakage current?

For the DS2476B variant, the input leakage current is specified between -1µA and +1µA, compared to -10µA to +10µA for the standard DS2476.

What cryptographic curves and algorithms are supported?

The device supports ECC-P256 for ECDSA signatures and key exchange, and SHA-256 for HMAC computations.