DS3645K

DS3645 4KB Secure Memory with Tamper Protection for Network Server Applications Single-Chip Solution Integrates Advanced Physical Security with On-Chip Encryption Key Memory NDA Required. Request Full Data Sheet Description The DS3645 is a secure supervisor with 4096 bytes of SRAM for applications requiring the secure storage of sensitive data and the physical tamper-sensing response functions required in cryptographic processors and data security equipment. One of the DS3645's primary features is the on-chip encryption key memory, consisting of 32 128-byte banks incorporating a high-speed, direct-clearing function. The 4KB key memory is constantly complemented in the background to prevent memory imprinting. In the event of a qualified tamper event, the key memory is rapidly cleared and a negative bias is applied to clear SRAM external to the DS3645. The device includes a real-time seconds counter, watchdog timer, CPU supervisor, nonvolatile (NV) 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 key memory, seconds counter, and tamper-detection circuitry active. The DS3645 provides low-leakage tamper-detection inputs for interface to external sensors, interlocks, and antitamper meshes. The DS3645 also invokes a tamper event if the backup battery drops below a specified threshold or 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 timestamped for future debugging purposes. Access to the seconds counter, tamper monitoring, key memory, and device configuration is conducted through an I2-C-compatible interface. The DS3645 is assembled in a CSBGA package, which enhances key security because the leads are not exposed to the outer edges of the package. Key Features                  4096-Byte Nonimprinting Key Memory with High-Speed Erase Optional External SRAM Clear Upon Qualified Tamper Event 64-Byte General-Purpose RAM (Not Cleared) 32-Bit Seconds Counter Watchdog Timer CPU Supervisor Four General-Purpose Tamper-Detect Comparators Four Window Comparators with On-Chip Reference Voltages Two Tamper-Detect Logic Inputs On-Chip, Programmable Temperature Sensing with Proprietary Rate-of-Change Detector On-Chip Random-Number Generator (RNG) Latching and Timestamping of Tamper Events Crystal Oscillator Tamper Monitoring Low-Power Consumption Wide Temperature Range: -55°C to +95°C CSBGA Package (7mm x 7mm x 0.8mm) with No Horizontally Exposed Leads I²C-Compatible Interface Applications/Uses      Alarm Systems Gaming IT Security Point-of-Sale Terminals Routers/Switches Part Number Analog Voltages Monitored Digital Inputs Monitored Internal Key Memory (Bytes) DS3645 12 4 4096           Package/Pins CSBGA/49 Oper. Temp. (°C) -55 to +95 Part Number Status Carrier Type Package DS3645B+ Active Tray CSBGA; 49Pin; 49mm2; DS3645B+TRL Active Reel CSBGA; 49Pin; 49mm2; DS3645K Active Box DS3645B-TRL NLA Reel CSBGA; 49Pin; 49mm2; DS3645B Active Tray CSBGA; 49Pin; 49mm2; DS3645B-W+ NLA Tray CSBGA; 49Pin; 49mm2;                                                 https://www.maximintegrated.com/en/products/power/supervisors‐voltage‐monitors‐sequencers/DS3645.html/tb_tab0 9‐14‐17