What the dual-output and stability spec mean for your clock tree
The DSC6121CI2A-00APT: Two frequencies on one die means one oscillator replaces two cans — the 19.44 MHz output typically clocks a SerDes or Ethernet PHY while the 25 MHz output feeds the main SoC or FPGA, saving board space and reducing BOM count. The ±25 ppm stability over temperature and voltage means the oscillator holds its frequency within 25 parts per million of the nominal value — tight enough for most 100BASE-TX and USB clocking without an external PLL cleanup.
Obsolete — sourcing through independent distribution
No pin-compatible drop-in replacement is published by Microchip, so a board spin may be required for a substitute oscillator.