No need to argue, just read up on their respective datasheets from Winbond.
From the Winbond 942516CH datasheet (for all speed grades from CH-75 to CH-5), the manufacturing process is described as 0.13um. It also says the 942516CH is sorted into 4 speed grades (-75,-7,-6,-5).
I would be very surprised if Winbond has lines that produce ram using 0.18um, 0.166um, 0.15um & 0.13um in an overlapped timeframe. For starters, it means massive investment wasted, as 0.166 & 0.15 are not necessary as Winbond is already migrating to 0.13 at the time when the BH series was in production. The incremental benefits offered by 0.166 & 0.15 over 0.18 does not justify the investment needed. Secondly, why would Winbond waste production cost in producing chips in a larger process when a smaller & more cost effective process is available (not to mention the cost in inventory controls)? Thirdly, what happens to those CH-5 that cannot function at 200MHz but can do so at 166MHz?? Do they junk them altogether?? They surely can't be called CH-6 if it's from a different process!!!
The words AH, BH, CH tells u which generaation it belongs, & the -75, -7, -6, -5 tells u it's speed. If u look at the ICs themselves, it's printed "BH-5" or "CH-5", BH5 or CH5 is just an abbreviation.
http://www.winbond.com.tw/c-winbondh...2_g_1_a.htm#06
Datasheet for CH series available at bottom of the page.
