Why a MEMS oscillator sidesteps quartz startup issues
The DSC1121BI2-020.0000T uses a MEMS resonator instead of a quartz crystal — no load-capacitance matching, no negative-resistance margin to verify, and no startup delay from a high-ESR blank. The MEMS structure is sealed at the wafer level and does not age or drift the way a quartz blank does over thermal cycling. Output is CMOS, so it drives standard logic inputs directly without an external buffer. The enable/disable function lets the system gate the clock line for low-power sleep modes without a separate load switch.
Industrial temperature grade and supply flexibility
Frequency stability is ±25 ppm across the full temperature and voltage range, which keeps the 20 MHz clock within ±500 Hz of nominal — tight enough for a CAN bus or a 100BASE-TX PHY reference.
Microchip lists the DSC1121BI2-020.0000T as Active. There is no NRND notice or last-time-buy window — the part is available for both new designs and production replenishment. Sourced through independent distribution; quoted to order against the BOM quantity.