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SN74AUC2G240: IBIS model

Part Number: SN74AUC2G240

Tool/software:

Hi,

I am using this component for a PCB design. I want to match impedances to reduce ringing.

I am looking at the IBIS model and comparing it to the datasheet. I am unable to infer the setup for parameter extraction. Can you please help to elucidate how the source impedance could be extracted?

The test fixture in the datasheet and my expectation do not match.

  • Why does the datasheet callout 2*Vcc
  • Why is there a V_fixture = 1.8V for the rising waveform?
  • Why are there load resistors?

I am also trying to calculate the source impedance for the following devices using the IBIS dataset:

SN74AUC04RGYR

LMK1C1102PWR

SN74AXC1T45DRLR

74AUC1G74

SN74AUC08RGYR

SN74ALVC04DGVR

LMK03318RHSR

Thanks.IBIS_Questions_for_TI.pptx