DS12B887

The DS12B887 can operate in the absence of power when V CC falls below a level of approximately 3 volts. At this point, the external V CC supply is switched off, and an internal lithium energy source supplies power to the Real Time Clock and the RAM memory. This allows the real-time clock function to continue operating, and all RAM, time, calendar, and alarm memory locations remain nonvolatile regardless of the V CC input level.

The DS12B887 has 114 bytes of general purpose RAM.

The purpose of the DS12B887 Real Time Clock is to serve as a direct replacement for the DS1287A or DS12887A, offering identical form, fit, and function. It is a nonvolatile time-of-day clock that can maintain time, calendar, and memory even in the absence of power. The clock includes features such as a one-hundred-year calendar, programmable interrupt, square wave generator, and 114 bytes of nonvolatile static RAM. It is designed to be a complete subsystem, replacing multiple components in a typical application. The DS12B887 also provides a programmable square wave output signal and bus-compatible interrupt signals.