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SN74GTL2003: Level translator C ON capacitance

Part Number: SN74GTL2003
Other Parts Discussed in Thread: SN74LVC1G34

Hi Team

I am using SN74GTL2003 level translator to pass a 50MHz clock through it. Please let me if this is the right part for this application

1) I see in the SN74GTL2003 datasheet it has a C(on) capacitance of 30pF and someplace it is mentioned as 18.6pF, which one to consider? will this part support Oscillator with 15pF

2) SN74GTL2003 is an open drain part, is it ok if I do not add a pull-up on Dn pin for the clock signal? or is it must to have a pull up on each Dn line

3) Datasheet says this Supports 50 MHz Up/Down Translation at <=20pF Cap Load...what does this mean? can I transmit a 50MHZ clock signal through this translator without any signal integrity issues?

or should i consider a level translator with at least 250MHz support (50MHz with 5 harmonics is 50*5=250MHz)

  • Hey Santosh,

    For this, I would recommend a buffer device instead. A device like the SN74LVC1G34 would be better for this. It has over voltage tolerant inputs and has a low Cin. It looks like the oscillator can only be loaded down with 15 pF, so its better to have a buffered device (the current device isn't buffered).

  • Hi Dylan

    Could you please suggest about below query

    The datasheet says this Supports 50 MHz Up/Down Translation at <=20pF Cap Load...what does this mean? can I transmit a 50MHZ clock signal through this translator without any signal integrity issues?

  • Hey Santosh,

    Its possible to achieve that frequency, but the SI will depend on the system loading. This is a passive switch device which means it doesn't provide any drive of its own, it relies on the interfacing devices and pull-ups to drive High and Low.