TLK2501 driven from 3.3V data source


I would like to drive the TLK2501 chip by a source operating at 3.3V LVTTL voltage level. According to the specification, the maximum ratings for the TXD inputs are between -0.3V to Vdd+0.3V. It gives the upper limit equal to 2.8 V which is much below 3.3 V (+reflections). Has anybody faced with that problem ? Do I have to use voltage level transators ? Or maybe an active parallel termination is the possible, resonable way (prevents against reflections and reduces the output voltage level) ? Since I am rather a beginner, what would you reccomend ? Thanks in advance.

Best regards,


1 Reply

  • Hi Adrian,

    I wouldn't recommend driving the TXD pins directly with a 3.3-V source.  Exceeding the absolute maximum ratings may result in permanent damage to the device.  Instead, there are a few options:

    I hope this helps.

    Max Robertson
    Analog Applications Engineer
    Texas Instruments