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7.4 of http://www.st.com/resource/en/datasheet/stm32f091vb.pdf WLCSP-64, 8x8 raster, 3.357x3.657mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.4mm; https://www.latticesemi.com/view_document?document_id=213 UFBGA-15, 4x4, 3x3mm package, pitch 0.8mm; see.

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