RTC IC With 242x8 NVSRAM Alarm Wake-up,Real-Time Clock (RTC)

The CMOS BQ3285E L (Real-Time Clock (RTC)) is a low-power Microprocessor peripheral providing a time-of-day Clock and 100-year calendar with alarm features and battery operation. The bq3285L supports 3V systems. Other BQ3285E L features include three maskable interrupt sources, square-wave output, and 242 bytes of general nonvolatile storage.
A 32.768kHz output is available for sustaining power-management activities. Wake-up capability is provided by an alarm interrupt, which is active in battery-backup mode.
The BQ3285E L write-protects the Clock calendar, and storage Registers during power failure. A backup battery then maintains data and operates the Clock and calendar.
The BQ3285E L is a fully compatible Real-Time Clock for IBM AT-compatible computers and other applications. The only external components are a 32.768kHz crystal and a backup battery.
By Texas Instruments