DS3645B+TRL

Application Specific Microcontrollers Overview

The DS3645B+TRL is a secure supervisor integrating 4096 bytes of nonimprinting SRAM for cryptographic key storage. It operates within a -55°C to +95°C range via an I²C-compatible interface in a 49-pin CSBGA package. The device features a 32-bit seconds counter, watchdog timer, CPU supervisor, and on-chip temperature sensor with rate-of-change detection. Upon qualified tamper events, it rapidly clears the 4KB key memory and applies negative bias to external SRAM. Additional security includes a random-number generator, crystal oscillator monitoring, and latching/timestamping of intrusion attempts.

Application Specific Microcontrollers Feature Summary

• 4096-byte nonimprinting key memory with high-speed erase and background complementation
• Integrated real-time seconds counter, watchdog timer, and CPU supervisor
• Tamper detection via four comparators, two logic inputs, and on-chip temperature sensing
• CSBGA package (7mm x 7mm) with no horizontally exposed leads

Application Specific Microcontrollers Applications

• Network server applications requiring secure data storage
• Cryptographic processors and data security equipment
• IT security systems and routers/switches
• Point-of-sale terminals and alarm systems

Application Specific Microcontrollers Procurement Notes

Verify the 'TRL' suffix indicates reel packaging rather than tray distribution. Confirm active status through authorized distributors. Ensure compatibility with I²C bus voltage levels and check for NDA requirements regarding full datasheet access if detailed electrical parameters are needed.

Application Specific Microcontrollers Selection Notes

Select this component when physical tamper protection and secure key storage are required. The CSBGA package offers enhanced security by hiding leads. Verify that the 4096-byte internal memory meets capacity needs and that external SRAM clearing functionality aligns with system architecture.

Application Specific Microcontrollers Part Context

This part belongs to the DS3645 family of secure supervisors. Variants include DS3645B (tray), DS3645K (box), and DS3645B-TRL (reel). The DS3645B+ denotes lead-free compliance. All variants share identical functional specifications and pinouts.

Application Specific Microcontrollers Replacement Considerations

Direct substitutes within the same family include DS3645B and DS3645K. Packaging differences exist between tray, box, and reel formats. No cross-manufacturer equivalents are documented in the provided source material.