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SRAM controller features RTC, tamper detection

Sunnyvale, Calif. — Maxim Integrated Products has introduced the DS3605 I2C-compatible, secure, nonvolatile (NV) SRAM controller with tamper detection. Designed for applications such as secure transaction terminals in which the security of encryption keys is critical, the DS3605 NV SRAM controller allows users to specify their own external SRAM.

When a tamper event occurs, the DS3605 quickly erases the encryption keys on this external SRAM. To further enhance security, this device integrates a real-time clock (RTC), battery-backup controller, system power monitor, CPU supervisor, temperature sensor, and four uncommitted tamper-detection comparator inputs.

The four uncommitted tamper-detection comparator inputs interface with a variety of tamper-detection mechanisms such as anti-tamper meshes, external case switches, and digital interlocks. In the event of a primary power failure, the DS3605 immediately switches over to an external battery power source to keep the tamper circuitry alive. This device also continuously monitors the substrate temperature and crystal oscillator. If the substrate temperature exceeds the factory-preset levels or changes, the DS3605 initiates a tamper event. Once a tamper event is registered, it is then time stamped and stored for analysis.

Packaged in a lead-free, 5 x 5-mm, 25-ball CSBGA for added security, the DS3605 is fully specified over the -40°C to +85°C extended temperature range. For tracing purposes, each device is inscribed with a unique 64-bit serial number.

Product information: DS3605

Maxim Integrated Products , 1-800-998-8800, www.maxim-ic.com

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