DS2476Q+U

Specialized ICS Overview

The DS2476Q+U is a DeepCover secure coprocessor designed for cryptographic operations and secure data storage. It integrates an ECC-P256 compute engine for ECDSA signature generation/verification and ECDH key exchange, alongside a SHA-256 engine for HMAC functions. The device includes a FIPS/NIST-compliant true random number generator (RNG), 8Kb of secured EEPROM, a decrement-only counter, and two configurable GPIO pins. Communication occurs via an I2C interface supporting up to 1MHz clock frequency. Operating voltage ranges from 2.2V to 3.63V, with an active supply current of 300µA. It features a unique 64-bit ROM ID and operates within a temperature range of -40°C to +85°C in a 6-pin TDFN package.

Specialized ICS Feature Summary

• ECC-P256 Compute Engine: Supports FIPS 186 compliant ECDSA signature generation/verification and ECDH key exchange.
• SHA-256 Compute Engine: Provides FIPS 180 compliant HMAC capabilities and OTP encrypted memory access.
• Integrated Security Resources: Includes NIST SP 800-90B compliant RNG, 8Kb secured EEPROM, and a 17-bit decrement-only counter.
• Configurable GPIO: Two open-drain GPIO pins support authenticated/non-authenticated control and secure boot modes.

Specialized ICS Applications

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

Specialized ICS Procurement Notes

Verify the specific suffix 'Q' indicates the qualified version with a minimum operating voltage of 2.2V, distinct from the standard DS2476 which requires 2.97V minimum. Confirm the '+U' suffix denotes the lead-free/RoHS-compliant TDFN-EP package. Check current production status as availability may be limited. Ensure I2C pull-up resistors are correctly sized for the 1MHz maximum clock speed requirement.

Specialized ICS Selection Notes

Select the DS2476Q+U when system power rails drop below 2.97V, as the 'Q' variant supports operation down to 2.2V. The standard DS2476+U is restricted to a 2.97V minimum supply. Both variants share identical cryptographic engines and EEPROM capacity. Verify that the host controller supports I2C communication and can handle the required slave address configuration. Consider thermal resistance characteristics if the application involves high ambient temperatures or dense PCB layouts.

Specialized ICS Part Context

The DS2476 series serves as a companion to the DS28C36 secure storage device, enabling complex cryptographic operations on stored data. The 'Q' designation specifically identifies the extended voltage range variant compared to the base model. This component belongs to the DeepCover family, emphasizing hardware-based security against invasive and non-invasive attacks through features like active die shields and encrypted key storage.

Specialized ICS Replacement Considerations

The DS2476BQ+T is a compatible alternative offering similar functionality with potentially different packaging or tape-and-reel options. Verify that any substitute maintains the 2.2V minimum operating voltage if low-power applications are critical. Ensure the replacement part supports the same I2C slave address and command set to guarantee software compatibility without modification.