in Dallas secure battery-backup products DS3641 with a piece NV SRAM

a wholly owned subsidiary of Maxim Integrated Products AD604ARZ has Dallas Semiconductor introduced the DS3641 battery backup controller, the device can provide comprehensive data protection IC for e-sale terminal and other applications with sensitive data. To improve security, the controller real-time clock (RTC), an automatic battery switch, and 4-wire interface integrated into a CSBGA package provides active tamper detection and rapid erasure of key memory. Due to the high level of security, The DS3641 not only supports FIPS 140 security levels 3 and 4, but also meets the Common Criteria, the highest requirements of the PCI-PED and EMV-4.1 certification organizations. The DS3641s most innovative feature is its proprietary on-chip nonvolatile SRAM, the SRAM used to hold the key. This memory architecture to eliminate the possibility of memory imprinting of the oxidation on MLT04GS the SRAM cell. Therefore, this technique prevents the passive residual data in the memory cell. Another innovation of the memory architecture is the DS3641 tamper alarm, all of its the 1kB storage array can be cleared in less than 100ns. Data erase operation is so fast, memory, high-speed hardwired clearing function and on-chip power supply to ensure active erasure. DS3641 battery backup controller provides a tamper-detection inputs can be connected to the system voltages, AD7888AR resistive meshes, external sensors, and digital interlocks and components continued to be low-power monitoring. Device monitoring, real-time clock (RTC) crystal oscillator, if the door of the oscillator frequency is lower than the set limit, and will invoke a tamper response. The internal digital temperature sensor MAX807NCWE with programmable rate of temperature change detector, in order to protect the devices encryption key memory from thermal attacks. In addition, DS3641 constantly monitors the main power when the power failure will automatically switch to an external battery power in order to ensure the normal work of the SRAM, RTC, and tamper detection circuitry. The DS3641 is specified over the temperature range of -40 ℃ to +85 ℃. Source: International Electronic Business