{{tag>collection_az vendor_unknown year_unknown type_unknown tech_unknown foundry_unknown}}

Unknown 16-pin bare die found in my lab while imaging backlog. No idea of function, vendor, or original markings.

Preliminary analysis:
  * 1-metal 1-poly CMOS process
  * Large "herringbone" structures are pad drivers
  * Pad with trimmed corners is #1
  * Pad above it is #16, Vdd
  * Pad second from bottom on right is #8, Vss
  * Inner ring is Vss
  * Outer ring is Vdd
  * Best guess so far is loadable 4-bit up/down counter, maybe 74HC or CD4000 series

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