Why a 4.28 kHz MEMS oscillator exists
Most crystal oscillators bottom out around 32 kHz for real-time clocks. The output is standard CMOS, so it drives a logic input pin directly — no level translation or sine-to-square conditioning needed. Supply voltage spans 1.8V to 3.3V, covering both 1.8V-core and 3.3V-I/O domains on the same BOM line.
Automotive-grade timing for harsh environments
That qualifies it for under-hood and cabin modules where a commercial-grade oscillator would drift or fail. Frequency stability is ±20 ppm across that range, which is tighter than many quartz XOs at this price point.
Housed in a 4-VLGA package measuring 2.50 mm x 2.00 mm with a seated height of 0.89 mm.