The ECS-2520S33-250-FN-TR: That 25 MHz clock rate is the timing heart for MCU cores, UART baud trees, and Ethernet PHYs on industrial controller boards — the kind of clock you cannot move later without a board respin, which is why sourcing the exact frequency matters on the BOM line.
Enable/Disable pin and standby current draw
When disabled the part draws a maximum of 10 µA, versus 7 mA active. In battery-backed systems where the RTC domain stays powered while the main rails collapse, the 10 µA disable draw sits below the shelf current of most supercapacitors — the oscillator adds negligible drain while the system sleeps.