DP8570AV [National Semiconductor]

The DP8570A is a low-power timer clock peripheral (TCP) implemented in low-voltage silicon gate microCMOS technology. It provides a full-function real-time clock/calendar with 12/24-hour mode, day of week, and day of year counters. It includes two independent 10 MHz 16-bit timers with programmable modes, power fail features with internal supply switching to external battery, and an on-chip interrupt structure supporting periodic, alarm, timer, and power fail interrupts. The device has up to 44 bytes of CMOS RAM and is designed for battery-backed environments, with automatic data logging into RAM during power failure.