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发布时间：2009-03-20 浏览：4886次
- The DS3645 is a secure supervisor with an integrated RTC, automatic battery switch, and IІC interface.
- The first to support FIPS 140-2 Levels 3 and 4, this device provides the highest level of security available.
- Eight uncommitted external inputs allow designers to implement additional levels of security.
- The DS3645's comprehensive features are ideal for data protection in servers, cryptographic coprocessors, POS terminals, and secure communication applications.
The most innovative feature of the DS3645 is the 4KB of proprietary on-chip nonvolatile SRAM it uses to store encryption keys. This memory architecture constantly complements the SRAM cells to eliminate the possibility of memory imprinting due to oxide stress, thereby preventing the passive detection of data remnants in stressed memory cells. Additionally, the DS3645 employs a high-speed, hardwired clearing function to erase the entire 4KB array in less than 100ns after a tamper alarm has been generated by the device.
The DS3645 provides tamper-detection inputs, as well as low-power continuous monitoring of system voltages, resistive meshes, external sensors, and digital interlocks. The RTC crystal oscillator is also monitored and invokes a tamper response if the frequency falls outside the set threshold. An internal digital temperature sensor with a programmable rate-of-change detector protects the DS3645's internal encryption-key memory from thermal attacks. The DS3645 constantly monitors primary power; in the event of failure, an external battery power source is automatically switched in to keep the SRAM, RTC, and tamper-detection circuitry alive.
The DS3645 is specified over the -55°C to +95°C temperature range. Due to the secure nature of this product, please contact the factory for pricing and availability.
Maxim Integrated Products is a publicly traded company that designs, manufactures, and sells high-performance semiconductor products. The Company reported revenue in excess of $2 billion for fiscal 2008. Maxim was founded over 25 years ago with the mission to deliver innovative analog and mixed-signal engineering solutions that add value to its customers' products. To date, it has developed over 5900 products serving the industrial, communications, consumer, and computing markets. For more information, go to www.maxim-ic.com.
