I am using Google Chrome Version 37.0.2062.103 on Windows 8.1 Pro. When I got to this page with two PDFs and left click on both of them, I get different results. The Texas Instruments datasheet opens in Google's built-in PDF reader. Chrome offers to download the schematic diagram.
If in the download dialog at the bottom, I click the downarrow and choose "Always open files of this type" the behavior for both PDFs is the same. I tried this both before and after clearing my download history in Google Chrome.
What is causing this behavior difference between the two PDFs?