The DSC1121CM1-026.5625 is a MEMS-based XO (Standard) that delivers a 26.5625 MHz CMOS clock from a 2.25V to 3.6V supply rail — the wide voltage range lets it run from a 2.5V or 3.3V rail without an external LDO.
MEMS resonator vs quartz — what it changes for the BOM
The ±50 ppm frequency stability covers the full temperature range and supply variation.
6-SMD, No Lead package measuring 3.20 mm x 2.50 mm with a seated height of 0.90 mm — the standard 3.2 x 2.5 mm MEMS oscillator footprint. Surface-mount reflow profile follows JEDEC J-STD-020 for MSL level; no special bake required before assembly if the moisture barrier bag is intact. The Enable/Disable pin is active-low (disable when pulled low). If the pin is left floating, internal pull-up keeps the oscillator enabled — but for production, tie it to Vdd or a GPIO to avoid noise coupling.