What this RTC brings to the board
The NXP PCF85263ATL/AX is a low-power real-time clock and calendar in a 10-DFN package. It talks I²C to the host MCU, keeps time down to 0.885 µA at 3.3 V, and runs on anything from 0.9 V to 5.5 V. That means it can ride a coin cell through a power loss and still tick when the main rail is dead. On-chip alarm, leap-year compensation, and a watchdog timer save you an external supervisor IC and a few passives.
No NRND or EOL flags on record. No minimum-buy pressure for prototype quantities; volume pricing is a conversation.