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CDCLVC1104: Device Power input (Vcc) is 3V

Part Number: CDCLVC1104

Hi Sir/madam,

We are using this clock buffer for 25MHz clock and using 3 outputs for 3 different devices. Clock input is from 3.3V crystal oscillator.

Clarifications:

1. Can i give 3V (typical) as Vcc for this device? There may be Vcc voltage variation 2.8V (min) ~3.2V (max). Can this device work properly as expected in this case? Please confirm.

2. If i give supply as 3.3V, then out of 3 clocks, 2 devices will work in 3.3V domain (Also can work in 3V) but one device requires 3V domain only and maximum it will accept 3.15V. But this buffer output may reach 3.6V which will damage the receiver. Do you have any suggestion to solve this issue?  

Thanks & Regards,

Remya

  • Hi Remya,

    A1. I don't anticipate any issue with this supply variation.

    A2. In table 6.5, you can see that VOH and VOL decreases as output loading increases. Depending on the receiver, you may observe that the clock levels do not extend all the way to the rail.
    You might try to use some resistor load to decrease the swing, using a termination like Figure 4. Either way, I recommend to test it for confirmation.

    Kind regards,
    Lane