Analogue, Mixed Signal, LSI


Single-piece surface mount NVSRAM module has integrated realtime clock

10 August 2005 Analogue, Mixed Signal, LSI

Dallas Semiconductor claims to have introduced the world's first and only single-piece, surface mountable nonvolatile SRAM modules with an integrated realtime clock (RTC).

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

The modules also contain a battery. With intelligent circuitry, the Vcc is constantly monitored for out-of-tolerance condition. If this occurs, the lithium battery is automatically switched on and write protection is unconditionally enabled to prevent data corruption.

The RTC contains a full-function, Y2K clock/calendar with an RTC alarm, watchdog timer, battery monitor, and power monitor. Its registers contain century, year, month, date, day, hours, minutes, and seconds data in a 24-hour BCD format. No additional support circuitry is required for microprocessor interfacing. The devices can be used in place of SRAM, EEPROM, or flash components.

These 3,3 V modules are available in densities from 32 k x 8 bits to 1 M x 8 bits, all with the same footprint and pinout.



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