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Loading down the sn74auc1g126

MikeW9894
Intellectual 540 points
Other Parts Discussed in Thread: SN74AUC1G126

Hi,

I'd like to ask a question about this part: http://focus.ti.com/docs/prod/folders/print/sn74auc1g126.html

 

I'm operating it at 1.8V and it is buffering a 26MHz clock.  I don't have tools to simulate the part using IBIS or anything like that and I'm just trying to figure out a few specs that don't seem clear in the datasheet.  I'm wondering about the rise time and maximum capacitive loading capability.

 

I have a circuit that isn't passing the clock out very well as the long transmission line is having impedance and termination problems.  There may also be some capacitance issues as one way I get the nice sine wave I need (AC coupling the output) is to place a 330pF cap in series and a 220pF cap to ground right after this buffer chip.

 

Thanks!

  • 0
    TI__Mastermind 46480 points

    Hello Mike

    The datasheets specs were set with Cload at 15pf or 30pf.  The 330pf  in addition to a long transmition line would round off the edges and would lower the max operating frequency. This could cause signal degradation. This part has 8ma of drive and may not drive a long transmission line that is heavily loaded.