The DS3030, DS3045, DS3050 and DS3065 are what Dallas Semiconductor introduced as the world's first and only single-piece, surface-mountable nonvolatile SRAM modules with an integrated real-time clock (RTC). The modules provide a fully-integrated and convenient method to protect mission-critical data from unexpected and unscheduled power loss. Packaged in a 27x27mm, 256-ball BGA, these parts are completely sealed from the outside environment. All devices 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. The RTC in these new modules contains a full-function 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. Corrections for day of the month and leap year are made automatically. There is no limit to the number of write cycles that can be executed with these memory modules, and no additional support circuitry is required for microprocessor interfacing. These devices can be used in place of SRAM, EEPROM, or flash components. These 3.3V modules are available in densities from 32kx8 bits to 1Mx8 bits, all having the same footprint and pinout.
