24-pin DIP Real-Time Clock (RTC) plus RAM. The BQ4287 is a low-power microprocessor peripheral providing a time-of-day clock and 100-year calendar with alarm features and battery operation. Other features include three maskable interrupt sources, square wave output, and 114 bytes of general nonvolatile storage.

The BQ4287 write-protects the clock, calendar, and storage registers during power failure. The integral backup energy source then maintains data and operates the clock and calendar.

The BQ4287 uses its integral battery-backup controller and battery to make a standard CMOS SRAM nonvolatile during power-fail conditions. During power-fail, the bq4287 automatically write-protects the external SRAM and provides a VCC output sourced from its internal battery.

The BQ4287 is a fully compatible real-time clock for IBM AT-compatible computers and other applications.

This product is an ESD-class device. It cannot be returned for exchange or credit if the package has been opened. Please read the RTC Module FAQ in its entirety BEFORE ordering or replacing an RTC module.