Automotive-grade timing for CAN and serial buses
The DSC1221DI1-21M11840 is a MEMS-based XO (Standard) oscillator from Microchip's DSC12X1 series, delivering a 21.1184 MHz CMOS output from a 6-VDFN package. The 21.1184 MHz frequency is a common multiple for CAN FD bit timing and 100BASE-T1 Ethernet reference clocks, so it fits directly into automotive ECU and gateway clock trees without a PLL multiplier.
Supply range and output control
The supply voltage range spans 2.5V to 3.3V, covering the common 3.3V and 2.5V I/O rails in mixed-voltage automotive designs.
MEMS reliability vs. quartz in harsh environments
The MEMS resonator gives this oscillator a shock tolerance typically 5× higher than quartz — useful for engine-mount electronics or transmission control modules where vibration can induce quartz crystal fractures. The ±50 ppm frequency stability over -40°C to 85°C is adequate for most CAN and Ethernet jitter budgets; if the application requires tighter stability (e.g., ±25 ppm for 100BASE-T1), the DSC12X1 family includes higher-grade options.