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NVSRAM modules include RTC

Posted: 14 Jul 2005 ?? ?Print Version ?Bookmark and Share

Keywords:dallas semiconductor? nonvolatile sram? sram? nvsram? ds3030?

Dallas Semiconductor released what it claims as the world's first and only single-piece, surface mountable nonvolatile SRAM (NVSRAM) modules with an integrated real-time clock (RTC).

The new DS3030, DS3045, DS3050 and DS3065 modules augment the company's existing NVSRAM module family (static RAM plus a NV controller), and provide a fully integrated and convenient method to protect mission-critical data from unexpected and unscheduled power loss. Packaged in a 27-by-27mm, 256-ball BGA, these parts are completely sealed from the outside environment.

The modules contain a reflowable battery. Due to integrated intelligent circuitry, the Vcc is constantly monitored for an out-of-tolerance condition. When such a condition occurs, the lithium battery is automatically switched on and write protection is unconditionally enabled to prevent data corruption, explained Dallas.

The RTC in the new modules contains a full-function, year 2000-compliant (Y2KC) clock/calendar with an RTC alarm, watchdog timer, battery monitor, and power monitor. RTC registers contain century, year, month, date, day, hours, minutes, and seconds data in a 24-hour BCD format, and corrections for day of the month and leap year are made automatically.

The 3.3V modules are available in densities from 32k x 8 bits to 1M x 8 bits, all having the same footprint and pinout. This enables the product to grow in density, while still keeping the same footprint, Cypress added.

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