PCF8563T/5,518

The PCF8563 is a low-power CMOS real-time clock/calendar with a 400 kHz I2C interface, optimized for battery-backed timekeeping: typical supply current is just 0.25 uA at 3.0 V and operation spans 1.0 V to 5.5 V, so a coin cell or supercap keeps time through long power interruptions. A programmable clock output (32.768 kHz, 1.024 kHz, 32 Hz or 1 Hz), alarm and timer functions, and an internal voltage-low detector cover the needs of metering, appliances, automotive clusters and point-of-sale equipment without extra support chips. Order exactly this /5 variant in SOIC-8 on tape and reel (,518): it is the current production version, while the older /4 revision devices (T/F4) are no longer recommended by NXP for new designs, so do not accept /4 stock as a substitute on new builds. Parameters verified against NXP Semiconductors documentation.