Add TSOPII-54 Package
Created by: fvollmer
The TSOP-II-54 Package is used by various SDRAM chips. For example the MT48LC8M8A2TG is available from the memory library, but the TSOPII-54 Package is missing.
It was kind of hard to find the best landing pattern. I hope I got all the dimensions right. :)
Datasheet: https://www.micron.com/~/media/documents/products/data-sheet/dram/64mb_x4x8x16_sdram.pdf, http://www.cypress.com/file/42846/download
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