TLC2264AID date codes help & output capability differences

Hi,

I was wondering if anyone knows or runs into some limitations with these TLC2264AID:  http://focus.ti.com/docs/prod/folders/print/tlc2264a.html

some questions:

1. What’s the difference between these date codes (above marking “2264AI”):  71CK8TM and 17CH1HT?  the markings and (D or SOIC-14) package colors look different: “71CK8TM” looks very clean and sharp and seems to work fine; but “17CH1HT” looks brown and smudgy and gives us some problems.  Are there design or process differences on the die?  What about fab and packager differences?
2. Is there any production test data (QA or sample tests or FAR data) for the above, relating to the outputs and/or relating to operating to max supply voltage?
3. What is the output drive capability?  Output impdedance spec limits (dynamic and static)?  Current limits?  What’s the max load?  On the datasheet I see that there's a typical 220 or 240 ohms output impedance for a gain of 10 at 100kHz, as well as the typical impedance vs. frequency plots (Figs 30 & 31).  Please note that in our application we have a 2k ohm load, with a closed loop gain of 160, at a low frequency nearly DC, and the opamp is on a single +15V supply.  Can above parts drive that load? 

So far I have been able to decipher the data code format according to the below:

“MYLLLLS” tells me that one part was made in Jan 2007 and the suspected problem part made in July 2001.  http://focus.ti.com/general/docs/topsidemarkingformats.tsp?actionPerformed=listPkgTopSideFormats&pkg=SOIC

http://focus.ti.com/general/docs/topsidemarking.tsp?actionPerformed=viewTopSideMarkingFormat&pkg=SOIC&imgGrpId=2&imgId=1

what does the the last digit “S” or site refer to, having value of M or T?  is it M for Malaysia, and T for Taiwan?

Thanks for your help!

sean