December 13, 2018

"Luch" quartz wristwatch IC : weekend die-shot

Inside old (199x) Belorussian wristwatch I've found this IC:

After metalization etch:

New let's take a look at quartz - tuning fork cut at XY plane:


Enhance 224-176:

Enhance 34-36:

You can see here marks from laser frequency tuning and pyramids in Z-direction, probably due to etching anisotropy.

You can see them overclocked here.