Standby function — when the clock needs to sleep
Package and supply — board-fit checklist
4-SMD no-lead package, 5.00 mm x 3.20 mm body, 0.90 mm seated height — the footprint matches a standard 5.0 x 3.2 mm crystal oscillator pad layout, so a board designed for a quartz XO can take this MEMS part without a re-spin. Supply voltage range is 1.8 V to 3.3 V — the same BOM can serve 1.8 V core logic and 3.3 V I/O domains by choosing the appropriate rail; no external level shifter needed on the output because CMOS swings rail-to-rail.