Supply flexibility and timing margin
The DSC6121HI2A-00APT: Frequency stability is rated at ±25 ppm, which keeps the clock within tight bounds for 10/100 Ethernet PHYs and USB full-speed interfaces, though it is not tight enough for precision GPS holdover or IEEE 1588 grandmaster applications. Typical supply current is 3 mA max — low enough for battery-powered edge nodes, and the 4-VFLGA package dissipates that without any thermal concern even in still air.
Industrial temperature range and CMOS interface
The CMOS output swings rail-to-rail and drives standard digital loads directly — no external termination or bias resistors are required, simplifying the layout.
Obsolete — sourcing through independent channels
No pin-compatible direct replacement exists from Microchip; a board spin may be required for a new-design alternative.