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SPI serial SRAM chip. Looks like 4 metal layers and a fairly fine process geometry. CMP filler pattern is consistent with UMC 180 nm (pitch and dimensions of CMP filler and traces on both M4 and M3 match xc2c32a within 3%)
Package
8-pin SOIC.
Markings:
23K256I SN (e3) 1002 (Microchip logo) ADJ
Die
Size is approximately 2110 x 1120 μm (2.36 mm2)
Die copyright area. Markings:
M4-B (C) (M) 2006 E1090-A
Top left of SRAM array
Middle of SRAM array
Random logic, with focus on M4 and on M3
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