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A small 4Kx1 SRAM.

Package

КР537РУ2
8607

Die

A lot of markings but only mask IDs it seems.

siliconprawn.org_map_mikron_kr537ru2_single_mikron_kr537ru2_infosecdj_mz_nikpa20x.thumb.jpg

Top metal imaged under a Nikon Plan Apo 20x/0.75