SN74CB3T1G125: IBIS model output configuration

Lok Wei,

Input/Output Buffer Information Specification (IBIS) models only apply to buffers.  The SN74CB3T1G125 only has a buffer on the control logic pin whoes output controls the internal circuitry of the IC to turn on and off the signal path.  The signal path can though of as a passive FET switch and not a buffer which is why there isn't an output option.  The signal path simply passes the signal from one side of the switch to the other.

Why are you using the SN74CB3T1G125 instead of a level shifter product like the  LSF0101? 

Thank you,

Adam

Lok Wei,

You can see the behavior of the SN74CB3TXXX family in this application note.