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THS4141: Slew rate issue on Pspice for TI model

Part Number: THS4141
Other Parts Discussed in Thread: TINA-TI, THS4501, THS3092


I am trying to use the THS4141 model on Pspice to transform a 5 V amplitude square signal ( 200kHz frequency) into a 15V amplitude 8V differential signal. (16V single supply )
 The signal generation works correctly, I simply have a question regarding the Slew Rate. 

The datasheet gives a 450V/us slew rate. As you can see on the following capture, my signal is increasing from 8 to 15V in around 200ns where we should be expecting around 15ns in theory.

Do you have any idea what may be wrong here ?

Thanks for your help

Best regards