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Status
Part Number	Status
DS3640	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Description

Request Full Data Sheet The DS3640 is a secure supervisor with 1024 bytes of SRAM for applications requiring the secure storage of encryption keys, including POS terminals. The DS3640 supports the highest security level requirements of the FIPS 140.2, Common Criteria, PCI PED, and EMV® 4.1 certification agencies. The 1kB key memory is constantly complemented in the background to prevent oxide stress and memory imprinting. In the event of a qualified tamper event, the key memory is rapidly and completely cleared. The device includes a real-time clock (RTC), CPU supervisor, watchdog timer, and on-chip temperature sensor. In the event of a primary power failure, an external battery source is automatically switched in to keep the key memory, RTC, and tamper-detection circuitry active. The DS3640 provides low-leakage tamper-detection inputs for interface to external sensors, interlocks, and anti-tamper meshes. The DS3640 will also invoke a tamper event if the backup battery drops below a specified threshold, absolute temperature or temperature rate-of-change exceeds programmed limits, or crystal-oscillator frequency falls outside a specified window. The tamper event is latched and time stamped for future debugging purposes. Access to the RTC, tamper monitoring, key memory, and device configuration is conducted through an I²C-compatible interface. The DS3640 is assembled in a Pb-free BGA package, which enhances key security in that the leads are not exposed to the outer edges of the package.

Key Features		Applications/Uses
1024-Byte Non-Imprinting Key Memory with High Speed Erase 64-Byte General-Purpose RAM (Not Cleared) RTC Watchdog Timer CPU Supervisor Four General-Purpose Tamper Detect Comparators with Associated Reference Three Tamper-Detect Logic Inputs On-Chip Programmable Temp Sensor On-Chip Random Number Generator (RNG) Latching and Time Stamping of Tamper Events 3.0V to 3.6V Single Supply Operation BGA Package with No Horizontally-Exposed Leads Underwriters Laboratories (UL®) Recognized		Alarm Systems Automated Teller Machines Digital Cinema Technology Gaming Healthcare IT Security Network Servers PIN Pads POS Software-Defined Radios