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Secure supervisor circuit incorporates tamper detection

Sunnyvale, Calif. — Maxim Integrated Products has introduced the DS3650 SPI-compatible secure battery-backup controller and supervisor with temperature and voltage monitoring. Specifically designed to meet the requirements of payment card industry-PIN entry device (PCI-PED) certification, the DS3650 integrates a battery-backup controller, system power monitor, CPU supervisor, temperature sensor, and two tamper-detection comparators. The high integration and advanced security features make it suitable for point-of-sale (POS) terminals, PIN pads, and other equipment where data protection and security is critical.

The DS3650 provides two tamper-detection comparator inputs to interface with and low-power continuous monitoring of resistive anti-tamper meshes, external sensors, and digital interlocks. This secure supervisor constantly monitors primary power, and in the event of failure, it automatically switches to an external battery power source to keep the device and external circuitry alive. The DS3650 also constantly monitors battery voltage and initiates a tamper response when the battery voltage becomes abnormal.

To facilitate recovery analysis after a tamper event occurs, an elapsed-time seconds counter freezes the value of a free-running 32-bit counter. In addition, a user-programmable, internal digital temperature sensor provides a tamper response in the event of a thermal attack and freezes temperature and voltage values for recovery analysis.

Packaged in a lead-free, 4 x 4 mm, 16-ball CSBGA for added security, the DS3650 is fully specified over the -40°C to +85°C extended temperature range. For tracing purposes, each device is inscribed with a unique 4-bit serial number.

Datasheet: DS3650

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

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