The DSC1123CI2-100.0000: This is a 100 MHz LVDS oscillator from the DSC1123 family, built on a MEMS resonator rather than a quartz crystal — the MEMS die is sealed in a standard 6-SMD no-lead package, so the part behaves like a quartz oscillator but with better shock and vibration tolerance. The LVDS output delivers a differential signal with low swing (350 mV typical), which means the trace pair on the PCB must be routed as a 100-ohm differential pair — a single-ended clock trace will not work here. Supply voltage spans 2.25V to 3.63V, so it runs off a 2.5V or 3.3V rail without an extra LDO — handy when the board already has both rails and you want to avoid a second regulator.
Package and footprint — 6-SMD no-lead
Package is 6-SMD no-lead, 3.20 mm x 2.50 mm body, 0.90 mm seated height — a standard MEMS oscillator footprint shared across the DSC1102/1123 families, so a board layout for one accepts the other.