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SN74LVC1G3157: About the internal switching model for SN74LVC1G3157- only the resistance model?

Part Number: SN74LVC1G3157
Other Parts Discussed in Thread: TMUX1237

Tool/software:

Hi Team, 

      we got a technical question from a key customer, the back ground is : customer want to make sure the output of A is very low enough under conduction status once the B1 or B2 's input signal is latched by the 50ohm equivalent resistance.( if we assume there is also a pull up resistor on the B1 or B2 input signal side)

        in order to calculate the voltage on Pin-A,  one need to know the internal switching behavior , from datasheet, 1.8Vcc will contribute 15ohm's internal conduction resistance, so, if it  is only a resistor model for the steady switching status, that is easy to calculate the voltage on Pin-A (output). so can you help to confirm if there is only the resistance model but not a combination model with diode behavior?

       If it is the combination model, how we can obtain the exact voltage on PIN-A under steady input side's latch status, thanks!