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Random Access Memory Cube Holding Fixture

IP.com Disclosure Number: IPCOM000115519D
Original Publication Date: 1995-May-01
Included in the Prior Art Database: 2005-Mar-30
Document File: 2 page(s) / 51K

Publishing Venue

IBM

Related People

Harper, BM: AUTHOR [+3]

Abstract

Disclosed is the design for a Random Access Memory (RAM) (Figure) which eliminates the need for a new set of tool and equipment to test and process RAM Cubes. This fixture fits into existing Electronic Test and Inspection equipment designed to process wafers, allowing the same required tests to be performed on RAM Cubes.

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Random Access Memory Cube Holding Fixture

      Disclosed is the design for a Random Access Memory (RAM)
(Figure) which eliminates the need for a new set of tool and
equipment to test and process RAM Cubes.  This fixture fits into
existing Electronic Test and Inspection equipment designed to process
wafers, allowing the same required tests to be performed on RAM
Cubes.

      In prior art, commercially available Test and Inspection
equipment performed operations on 125 and 200 millimeter wafers.  The
challenge was to use this same equipment to perform the same required
tests and inspections on memory Cubes as on wafers.

      A memory Cube is made by stacking a variable number of chips
one on top of another to form a Cube.  Because the number of chips
used varies, memory Cubes are different in height, width, and length
from each other.

      Most wafer equipment have programmable vacuum stages to secure
and move the wafer to programmed positions where tests and
inspections are performed.  The RAM Cube Holding Fixture holds memory
Cubes on the vacuum stage of the Test and Inspection equipment,
regardless of the Cubes size.

      The RAM Cube Holding Fixture has a flat bottom and circular
shape like a wafer so it can be set and secured on a programmable
vacuum stage.  On the fixture's top surface are two insteps
accurately machined at 90º  to each other.  The corner formed by
these two insteps allows the operator to accurately set the memory
Cub...