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--- azonenberg:microchip:23k256 [2014/04/08 07:13] – created azonenberg
+++ azonenberg:microchip:23k256 [2015/01/04 22:50] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 {{tag>collection_az vendor_microchip year_2006 type_memory type_memory/sram foundry_umc tech_180nm}}
-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 [[azonenberg:xilinx:xc2c32a]] within 3%)
+SPI serial SRAM chip. Looks like 4 metal layers and a fairly fine process geometry.
+Definitely //not// one of Microchip's standard fab processes. CMP filler pattern is consistent with UMC 180 nm (pitch and dimensions of CMP filler and traces on both M4 and M3 match [[azonenberg:xilinx:xc2c32a]] within 3%) however this is the only evidence we have to support this conclusion at this time; tag is tentative.
+The die ID also does not match the normal Microchip layout and there is no Microchip logo on the die. Maybe this mask set was acquired from a buyout or something?
+There are three unbonded pads on the die. Purpose of these is unknown at this time since all known packages are 8 pins.
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