www.microwavejournal.com/articles/36524-32768-khz-mems-based-tcxo-alternative

32.768 kHz MEMS-based TCXO Alternative
MEMS-based TCXO Alternative: SiT1566
August 11, 2021
RFMW announced design and sales support for SiTime’s ultra small, µPower, 32.768 kHz TCXO. SiTime's TempFlat MEMS technology enables the first 32 kHz TCXO in a 1.2 mm chip-scale package, the industry's smallest footprint. Typical core supply current is only 4.5 μA. The SiT1566 is factory calibrated over multiple temperature points to guarantee extremely tight, ±3 ppm all-inclusive frequency stability. Applications include smart meters, Health and Wellness monitors, pulse-per-second time keeping and RTC Reference clocks. The SiT1566 is available with short lead times from RFMW.