The DS3644 is a secure supervisor with 1024 Bytes of SRAM for the secure storage of sensitive data and the physical tamper-sensing response functions required in cryptographic processors and data security equipment.
One of the Maxim chip’s primary features is the on-chip non-imprinting memory, consisting of eight 128-Byte banks incorporating a high-speed, direct-wired clearing function. The 1 KB memory is constantly complemented in the background to prevent memory imprinting of data. The IC’s architecture allows the user to clear selective banks of the memory based upon specified tamper events. In the event of a qualified tamper event, the desired bank(s) of memory are rapidly cleared and a negative bias can be applied to erase external memory.
The DS3644 includes a seconds counter, watchdog timer, CPU supervisor, non-volatile SRAM controller and on-chip temperature sensor. In the event of a primary power failure, an external battery source is automatically switched in to keep the memory, time and tamper-detection circuitry active. The device provides low-leakage, tamper-detection inputs for interface to external sensors, interlocks and anti-tamper meshes. It also invokes a tamper event on absolute temperature, if the temperature rate-of-change exceeds programmed limits, or if the crystal oscillator frequency falls outside a specified window. The tamper event is latched and time-stamped for fault-recovery purposes.
Access to the timer, tamper monitoring, memory and device configuration is conducted through an I²C-compatible interface. The DS3644 is assembled in a lead-free, 7 x 7 x 0,8 mm CSBGA package.
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