USRE40061E1 - Multi-chip stacked devices - Google Patents
Multi-chip stacked devices Download PDFInfo
- Publication number
- USRE40061E1 USRE40061E1 US10/346,860 US34686003A USRE40061E US RE40061 E1 USRE40061 E1 US RE40061E1 US 34686003 A US34686003 A US 34686003A US RE40061 E USRE40061 E US RE40061E
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- die
- bonding pads
- lead
- lead fingers
- low
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- H01L24/42—Wire connectors; Manufacturing methods related thereto
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Definitions
- This invention relates to a multiple die module that has a thickness the same or less than a standard package but has two or more stacked die, thereby increasing device density.
- Semiconductor devices are typically constructed en masse on a silicon or gallium arsenide wafer through a process which comprises a number of deposition, masking, diffusion, etching, and implanting steps. When the devices are sawed into individual rectangular units, each takes the form of an integrated circuit (IC) die. In order to interface a die with other circuitry, it is (using contemporary conventional packaging technology) mounted on a lead frame paddle of a lead-frame strip which consists of a series of interconnected lead frames, typically ten in a row. The die-mounting paddle of a standard lead frame is larger than the die itself, and it is surrounded by multiple lead fingers of individual leads.
- IC integrated circuit
- the bonding pads of the die are then connected one by one in a wire-bonding operation to the lead frame's lead finger pads with extremely fine gold or aluminum wire.
- a protective layer to the face of the die, it, and a portion of the lead frame to which it is attached, is encapsulated in a plastic material, as are all other die/lead-frame assemblies on the lead-frame strip.
- a trim-and-form operation then separates the resultant interconnected packages and bends the leads of each package into the proper configuration.
- IC package density is primarily limited by the area available for die mounting and the height of the package.
- Typical computer-chip heights in the art are about 0.110 inches inch.
- a method of increasing density is to stack die or chips vertically.
- An upper, smaller die is back-bonded to the upper surface of the lead fingers of the lead frame via a first adhesively coated, insulated film layer.
- the lower, slightly larger die is face-bonded to the lower surface of the lead extensions within the lower lead-frame die-bonding region via a second, adhesively coated, insulative, film layer.
- the wire-bonding pads on both upper die and lower die are interconnected with the ends of their associated lead extensions with gold or aluminum wires.
- the lower die needs to be slightly larger in order that the die pads are accessible from above so that gold wire connections can be made to the lead extensions (fingers).
- U.S. Pat. No. 4,996,587 shows a semiconductor chip package which uses a chip carrier to support the chips within a cavity.
- the chip carrier as shown in the figures has a slot that permits connection by wires to bonding pads which, in turn, connect to the card connector by conductors.
- An encapsulation material is placed only on the top surface of the chip in order to provide heat dissipation from the bottom surface when carriers are stacked.
- a Japanese Patent No. 56-62351(A) issued to Sano in 1981 discloses three methods of mounting two chips on a lead frame and attaching the pair of semiconductor chips (pellets) to a common lead frame consisting of:
- the invention generally stated is a multiple-die low-profile semiconductor device comprising:
- FIG. 1 is a partial plan view of the stacked die, lead fingers, and bonded wires of the present invention.
- FIG. 2 is a side elevation taken through lines 2 — 2 of FIG. 1 showing a four die stacking.
- the stacked die device 10 is shown prior to encapsulation disclosing the top die 12 mounted upon to the paddle 14 and other dies 16 , 18 , and 20 ( FIG. 2 ) which are adhesively connected to each other by a controlled-thickness thermoplastic-adhesive layer at 22 .
- Thermoplastic indicating “Thermoplastic” indicates that the adhesive sets at an elevated temperature.
- the group of four dies are attached to the paddle 14 by a controlled thin-adhesive layer 24 .
- Each of the die bonding pads 26 in double rows are electrically connected to multiple lead fingers 28 A, 28 B, 28 C . . . 28 N by thin (0.001 inch) gold or aluminum wires 30 A, 30 B, 30 C . . . 30 N; gold being the preferred metal.
- the critical bonding method used at the die end pad 26 is an ultrasonic ball bond bond, as named by the shape of the bond as at 32 . This first-installed bond and formed gold wire are low-loop wire bonds as seen at critical dimension 34 , as will be described later.
- the other end of gold wires 30 are attached to the lead fingers by a wedge bond 36 , which is also an ultrasonic bond, indicating the use of ultrasonic energy to heat the wire 30 as it is compressed against the lead finger 28 .
- the wedge bond is not used on the die because the bonding machine contacts the bonding surface and could damage this critical surface.
- the lead fingers may be formed upward as at 38 to permit the use of shorter wires 30 .
- Paddle 14 which supports the stack is attached to the lead frame typically at four corners as at 40 and also typically, in this application, would have a downset from the lead frame and lead fingers 28 as at dimension 42 .
- the stack is finally encapsulated by a plastic or ceramic at 44 .
- a dimensional analysis is provided by referring to FIG. 2 .
- the encapsulation thickness 48 is between 0.010 and 0.012 inches inch.
- the paddle 74 14 thickness 50 can be between 0.005 and 0.010 inches inch and is a matter of choice.
- the controlled adhesive-layer thickness 52 can be from 0.001 to 0.005 inches inch.
- the individual dies 20 , 18 , 16 , and 12 each have a thickness 54 of 0.012 inches inch and the critical controlled, adhesive-layer thicknesses 56 between each die are between 0.008 and 0.010 inches inch. These thin layers have to be slightly greater than the low-loop wire dimension 34 , which is about 0.006 inches inch.
- the top encapsulation thickness 58 is between 0.010 and 0.012 inches inch so as to cover the top loop.
- the height at 60 would be between 0.058 and 0.073 inches inch and for a three-die stack it would be from 0.078 to 0.100 inches inch.
- the die pads 26 of each die can be each connected to an individual lead finger 28 or the dies can be wired in parallel.
- the final packages can be in the form of a small outline J-leaded (SOJ) package, a dual in-line package (DIP), a single in-line package (SIP), a plastic leaded chip carrier (PLCC), and a zig-zag in-line package (ZIP).
- SOJ small outline J-leaded
- DIP dual in-line package
- SIP single in-line package
- PLCC plastic leaded chip carrier
- ZIP zig-zag in-line package
Abstract
Description
- method 1 two chips mounted on two paddles;
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method 2 one chip mounted over a paddle and one below not attached to the paddle; and - method 3 one chip attached above and one chip attached below a common paddle.
The chips are apparently wired in parallel as stated in the “PURPOSE” of Sano.
- a lead-frame paddle supported by a lead frame;
- a controlled, first, thin-adhesive layer affixing a first die above the paddle;
- a plurality of thin wires having a first low-loop wire bond to a plurality of first die-bonding pads and a second wire bond to a plurality of adjacent lead-frame lead fingers;
- a second thin-adhesive layer affixing a second die above the first die;
- a second plurality of thin wires having low-loop wire bonds to a plurality of second die-bonding pads and second wire bonds to the plurality of lead fingers;
- additional dies affixed above the second die, by additional subsequent layers of adhesive and having additional thin wires bonded to addition additional bonding pads and lead fingers; and
- an encapsulated layer surrounding all dies, adhesive layers, and thin wires.
Claims (12)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US10/346,860 USRE40061E1 (en) | 1993-04-06 | 2003-01-16 | Multi-chip stacked devices |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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US08/043,503 US5291061A (en) | 1993-04-06 | 1993-04-06 | Multi-chip stacked devices |
US08/610,127 USRE36613E (en) | 1993-04-06 | 1996-02-29 | Multi-chip stacked devices |
US42712399A | 1999-10-21 | 1999-10-21 | |
US10/346,860 USRE40061E1 (en) | 1993-04-06 | 2003-01-16 | Multi-chip stacked devices |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US08/043,503 Reissue US5291061A (en) | 1993-04-06 | 1993-04-06 | Multi-chip stacked devices |
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USRE40061E1 true USRE40061E1 (en) | 2008-02-12 |
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Application Number | Title | Priority Date | Filing Date |
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US10/346,860 Expired - Lifetime USRE40061E1 (en) | 1993-04-06 | 2003-01-16 | Multi-chip stacked devices |
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US (1) | USRE40061E1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20080122113A1 (en) * | 2006-08-17 | 2008-05-29 | Corisis David J | Semiconductor device assemblies and systems including at least one conductive pathway extending around a side of at least one semiconductor device and methods for forming the same |
US20080142942A1 (en) * | 2006-12-19 | 2008-06-19 | Yong Du | Method and apparatus for multi-chip packaging |
US20090146278A1 (en) * | 2006-09-12 | 2009-06-11 | Chipmos Technologies Inc. | Chip-stacked package structure with asymmetrical leadframe |
US8384228B1 (en) * | 2009-04-29 | 2013-02-26 | Triquint Semiconductor, Inc. | Package including wires contacting lead frame edge |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
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JPS5662351A (en) | 1979-10-26 | 1981-05-28 | Hitachi Ltd | Semiconductor device for memory |
JPS60182731A (en) | 1984-02-29 | 1985-09-18 | Toshiba Corp | Semiconductor device |
US4567643A (en) | 1983-10-24 | 1986-02-04 | Sintra-Alcatel | Method of replacing an electronic component connected to conducting tracks on a support substrate |
JPS62126661A (en) | 1985-11-27 | 1987-06-08 | Nec Corp | Hybrid integrated circuit device |
JPS63128736A (en) | 1986-11-19 | 1988-06-01 | Olympus Optical Co Ltd | Semiconductor element |
JPS6428856A (en) | 1987-07-23 | 1989-01-31 | Mitsubishi Electric Corp | Multilayered integrated circuit |
US4984059A (en) | 1982-10-08 | 1991-01-08 | Fujitsu Limited | Semiconductor device and a method for fabricating the same |
US4996587A (en) | 1989-04-10 | 1991-02-26 | International Business Machines Corporation | Integrated semiconductor chip package |
US5012323A (en) | 1989-11-20 | 1991-04-30 | Micron Technology, Inc. | Double-die semiconductor package having a back-bonded die and a face-bonded die interconnected on a single leadframe |
JPH03169062A (en) | 1989-11-28 | 1991-07-22 | Nec Kyushu Ltd | Semiconductor device |
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US20080122113A1 (en) * | 2006-08-17 | 2008-05-29 | Corisis David J | Semiconductor device assemblies and systems including at least one conductive pathway extending around a side of at least one semiconductor device and methods for forming the same |
US7888185B2 (en) * | 2006-08-17 | 2011-02-15 | Micron Technology, Inc. | Semiconductor device assemblies and systems including at least one conductive pathway extending around a side of at least one semiconductor device |
US20090146278A1 (en) * | 2006-09-12 | 2009-06-11 | Chipmos Technologies Inc. | Chip-stacked package structure with asymmetrical leadframe |
US20080142942A1 (en) * | 2006-12-19 | 2008-06-19 | Yong Du | Method and apparatus for multi-chip packaging |
US7691668B2 (en) * | 2006-12-19 | 2010-04-06 | Spansion Llc | Method and apparatus for multi-chip packaging |
US20100164124A1 (en) * | 2006-12-19 | 2010-07-01 | Yong Du | Method and apparatus for multi-chip packaging |
US8324716B2 (en) * | 2006-12-19 | 2012-12-04 | Spansion Llc | Method and apparatus for multi-chip packaging |
US8384228B1 (en) * | 2009-04-29 | 2013-02-26 | Triquint Semiconductor, Inc. | Package including wires contacting lead frame edge |
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