Specs for Line Driver

Hello,

I'm not very clear on what are the specs to look for when trying to see if a line driver IC is capable of driving a certain line. For example, take the SN74ls240 https://ecee.colorado.edu/~mcclurel/sn74ls240rev5.pdf , if I am to take that to drive a coax cable about 150 feet with 50 ohm load for impedance match, what parameters do I need to look at to determine if this IC is capable of driving the cable? Thanks!

You can usually go by the IOH and IOL spec. For 50 ohm you need about 40 ma to meet VIH logic levels. The part you listed is not a 50 ohm line driver. See this data sheet. https://www.electro-tech-online.com/custompdfs/2010/05/sn74128.pdf Or this part.
https://www.electro-tech-online.com/custompdfs/2010/05/sdls210.pdf

This is older tech, I am sure there are newer logic families, but I am done looking.

Thanks for replying. One more question, what is the significant of putting a resistor after the driver, assume its for impedance matching to Zo of transmission line and Zload. Though, I saw working design that did not put a resistor after the driver at all.