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LMK6C: Support on Input output voltage comparison and series resistor required

Narender Mariappan
Prodigy 220 points
Part Number: LMK6C

Tool/software:

HI ,

We are using LMK6C Oscillator in our design. The output of the Oscillator is connected to FPGA Bank whose voltage is 1.8V.I have made VIH,VIL comparison for both devices Kindly check and tell. 

 Can we connect a series resistor at the Oscillator output pin for Debugging purpose ? If yes what is the resistor's value ,tolerance and Wattage to be connected?

  • 0
    TI__Expert 8460 points

    Hi Narender, 

    Usually for LVCMOS drivers a series resistor is not needed, so for debugging purposes you could just place a 0 Ohm resistor. The wattage for the resistor can be fairly small, even if the FPGA had an internal 50 Ohm termination then the current would be around (1.8V / 2) / 50 Ohm = 18mA. If the FPGA input is high-impedance then the current would probably be a few uA. 

    Based on the VIH/VIL requirements of the FPGA, I believe LMK6C should be compatible here. Let me know if you have any other questions.  

    Regards, 

    Connor