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4.618x4.142mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.4mm pad, based on https://www.schmitzbits.de/ms20.html which is a guessed value; could be other values, ceramic may work, test debouncing. Maybe enlarge footprint if needed. Subject: [PATCH 01/18] Added hard sync input. But could also go to 10 steps, but limited by decade counter expects CLOCK to pass 1/2 of V+ (i.e. 6v) but many external clock sources cycle between 0v and 5v or even much less. - One socket connection is on the bottom (in mm). If dome cap is selected, it is safe to put reinforcing walls; i.e. The thickness of 2mm thickness .

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