DS1302ZN+T&R is an Analog Devices real-time clock.
The device is specified at 3-wire CE / I/O / SCLK serial interface; single-byte and burst transfers.
Completely Manages All Timekeeping Functions Real-Time Clock Counts Seconds, Minutes, Hours, Date of the Month, Month, Day of the Week, and Year with Leap-Year Compensation Valid Up to 2100 31 x 8 Battery-Backed General-Purpose RAM Simple Serial Port Interfaces to Most Microcontrollers Simple 3-Wire Interface TTL-Compatible (V CC = 5V) Single-Byte or Multiple-Byte (Burst Mode) Data Transfer for Read or.
Its advantage is that the specification is backed by a published data sheet, so the part can be designed into production equipment without further characterisation.
What matters here is the industrial screening: the same board can go into a cabinet without a second qualification cycle.
It is used in metering and industrial controllers, where the function has to behave predictably over the life of the equipment.
