ATSHA204-SH-CZ-T

Specialized ICS Overview

The ATSHA204-SH-CZ-T is a CryptoAuthentication security IC designed for hardware-based key storage and authentication. It utilizes the SHA-256 algorithm to support secure challenge-response protocols, MAC, and HMAC operations. The device features a 4.5Kb EEPROM with 16 configurable slots for keys or data, alongside a guaranteed unique 72-bit serial number and an internal high-quality Random Number Generator (RNG). It operates on a supply voltage range of 2.0V to 5.5V with communication voltages from 1.8V to 5.5V. The component supports both 1MHz I2C and High-Speed Single-Wire interfaces, housed in an 8-lead SOIC package.

Specialized ICS Feature Summary

• Integrated SHA-256 hash engine supporting MAC and HMAC cryptographic operations
• 4.5Kb EEPROM memory organized into 16 slots for secure key and data storage
• Guaranteed unique 72-bit serial number for anti-clone protection
• Dual interface options: 1MHz I2C and High-Speed Single-Wire
• <150nA sleep current consumption

Specialized ICS Applications

• Anti-counterfeiting validation for consumables and daughter cards
• Secure boot validation and firmware protection
• Session key exchange for encrypted communications
• Network and computer access control

Specialized ICS Procurement Notes

Verify that the ordering suffix matches the required package type and tape/reel configuration. Confirm the specific revision level against the latest Microchip documentation, as older revisions may be marked as not recommended for new designs. Ensure compatibility with the host system's I2C or Single-Wire protocol requirements before finalizing procurement.

Specialized ICS Selection Notes

Select this component when a dedicated hardware solution for SHA-256 authentication is required without the complexity of full microcontrollers. Choose the 8-lead SOIC package for standard surface-mount assembly. Consider the Single-Wire interface if GPIO pin conservation is critical, or I2C for higher speed and standard bus compatibility. Ensure the design accounts for the <150nA sleep current for low-power applications.

Specialized ICS Part Context

This part belongs to the Atmel/Microchip CryptoAuthentication family, specifically the ATSHA204 series. It serves as a hardware security element to offload cryptographic tasks from the main processor. The 'SH' designation typically indicates the 8-lead SOIC package variant within the broader ATSHA204 product line.

Specialized ICS Replacement Considerations

Check for the ATSHA204A series, which offers updated features and is generally recommended over the original ATSHA204 for new designs. Verify pinout compatibility between the original ATSHA204 and potential replacements like the ATECC108A or ATECC508A, noting differences in cryptographic algorithms (SHA-256 vs ECC).