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CDCE913: Implication of setting input as XTAL but driving an LVCMOS clock

Talha Ansari
Prodigy 40 points
Part Number: CDCE913


Good Afternoon,

In one of our designs it was recently discovered that bits 3:2 in address 01h was set to 00b when the input clock is driven by an LVCMOS XO Clock. The design has worked for a couple of years without any issues. Even though the bits will now be set correctly to 10b, I wanted to understand if anything inside the part could have been damaged? I would assume that setting these bits adjusts input clock characteristics inside the part? Any information you can provide will be helpful.

Best Regards

Talha

  • 0
    TI__Genius 16845 points
    Hi Talha,

    These bits configure the input structure of the device. When you configure the device for an crystal input, it engages the internal crystal oscillator circuit which isn't needed for a CMOS reference.

    Even if the devices are still functional, I cannot be certain of whether or not the parts are damaged. The device may be damaged if you observe an increase in supply current, improper operation, or degraded output performance.

    Kind regards,
    Lane