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MAX36045
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Future Product |
Description
The MAX36045 is a security manager with 4096 bytes of SRAM for applications requiring the secure storage of sensitive data, as well as the physical tamper-sensing response functions required in cryptographic processors and data security equipment. The MAX36045's key feature is a random number generator (RNG) that meets NIST SP800-90 requirements. The certified RNG reduces customer certification time and provides added features that enable the customer to use a hardware RNG instead of a software RNG. Additionally, the MAX30645 has an authentication feature, which requires that authentication is established between the host processor and the MAX36045 before any critical data is exchanged.
One of the MAX36045's primary features is its 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 MAX36045.
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 MAX36045 provides low-leakage tamper-detection inputs for interface to external sensors, interlocks, and antitamper meshes. The MAX36045 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 I2C-compatible interface. The MAX36045 is assembled in a Pb-free CSBGA package, which enhances key security because the leads are not exposed to the outer edges of the package.
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Data Sheet
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