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SN74LVC1G98: propagation delay

Part Number: SN74LVC1G98
Other Parts Discussed in Thread: SN74LVC1G97

Team, 

My customer has the following question:   

Could you help us out with some basic understanding of how TI defines propagation delay (t_pd).  We have a design using multiple SN74LVC1G97/98 configurable gates.  We want to calculate our nominal propagation delay through these but the datasheet shows a wide range (1.1 - 6.1 ns for 5V).  In our case we aren't driving a large load, just another logic gate.  Can any guidance be provided on what a better estimate would be? How much of the delay is internal and how much is due to the load, Maybe a rough equation t_pd = ??ns + c_l * ??ns?

 Regards

Aaron