Dual-frequency MEMS oscillator for timing trees
The DSC400-0401Q0103KE2 is a MEMS-based XO (Standard) that replaces two discrete quartz oscillators with a single 20-VFQFN package, outputting 12.288 MHz and 100 MHz simultaneously.
Output flexibility and supply compatibility
Each output can be independently configured as HCSL or LVCMOS, so the 100 MHz clock can drive a PCIe reference (HCSL) while the 12.288 MHz feeds an Ethernet PHY or audio codec (LVCMOS) without external level translation. The wide supply range of 2.25V to 3.6V covers 2.5V and 3.3V rails directly, eliminating a dedicated LDO for the oscillator supply.
Stability and temperature grade
The -20°C lower limit means this part is not rated for cold-start automotive or outdoor telecom cabinet use; those applications need the industrial-temperature variant of the DSC400 family.
Package and board layout notes
The 20-VFQFN with exposed pad (5.00mm x 3.20mm body, 0.90mm height) requires a thermal via array under the pad for proper heat transfer; the datasheet layout recommendation should be followed to keep junction temperature within limits.