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SN74LVC8T245-Q1: LVC/HCT slewrates and impedances

Part Number: SN74LVC8T245-Q1

Hi guys,

I try to simulate issues in terms of impedance missmatch / slew rate of the signal. 

How can I get out the impedance when a LVC or HCT is transmitting? How "low" is it or how can I read it out of the datasheet?

A general dimension for LCV/HCT would be good to have to calculate e.g. a series termination resistor on my designs. 

Thanks,

Markus