Supply voltage, current draw, and stability — the real BOM fit
The DSC6102JI2A-000.0000: For a 100 MHz clock, that is ±2500 ppm of period jitter — fine for a UART or SPI bus, but tight enough that a 100BASE-TX Ethernet PHY's 25 MHz reference stays within the ±50 ppm window without a separate TCXO.
Lifecycle reality — obsolete, but still sourceable
The part is a blank (user-programmable) device, so a direct drop-in from another manufacturer is unlikely without a board spin. If you need a pin-compatible alternative, the DSC61XX family shares the same package and pinout; a different frequency or stability grade may substitute, but the blank-programmable nature means the replacement must be programmed to the same frequency.