What the dual-frequency output means for your clock tree
The DSC6121CI2A-00EW: That means one device replaces two discrete oscillators on the board, saving footprint and reducing BOM line count for a system that needs both a 25 MHz reference (common for Ethernet PHYs or USB controllers) and a 32 MHz reference (typical for MCU cores or Bluetooth basebands).
The 0.89 mm profile is low enough for card-edge or mezzanine assemblies where component height is constrained.
Lifecycle reality — obsolete, but sourced to order
Microchip lists the DSC6121CI2A-00EW as obsolete.