WO1999049499A2 - Procede de liaison et support de connexion d'un boitier csp avec un circuit integre - Google Patents
Procede de liaison et support de connexion d'un boitier csp avec un circuit integre Download PDFInfo
- Publication number
- WO1999049499A2 WO1999049499A2 PCT/FR1999/000669 FR9900669W WO9949499A2 WO 1999049499 A2 WO1999049499 A2 WO 1999049499A2 FR 9900669 W FR9900669 W FR 9900669W WO 9949499 A2 WO9949499 A2 WO 9949499A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- support
- connection
- window
- integrated circuit
- conductors
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L23/00—Details of semiconductor or other solid state devices
- H01L23/28—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection
- H01L23/31—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape
- H01L23/3107—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed
- H01L23/3114—Encapsulations, e.g. encapsulating layers, coatings, e.g. for protection characterised by the arrangement or shape the device being completely enclosed the device being a chip scale package, e.g. CSP
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/0001—Technical content checked by a classifier
- H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
Definitions
- the present invention is in the field of CSP type connector housings, English abbreviations for Chip Scale Package.
- connection support arranged on the integrated circuit in an architecture of the type known under the English terminology "fan-in”.
- the invention also relates to a connection support, an integrated circuit box, and an electronic assembly comprising such a box.
- connection support for example a printed circuit board, supports a plurality of conductors and provides the interface between the integrated circuit and the external environment of the chip using, for example a connection technology by a network of balls weld known as BGA, Anglo-Saxon abbreviations for Bail Grid Array.
- connection pads which are generally formed by a local enlargement of the conductors on the connection support, and on the other hand, for example, to another connection support coupled to the supply terminals supply voltages and control signals.
- a fan-in type connection structure can be likened to a stack typically comprising at the lower level the integrated circuit and at the higher level, the interface with the control signals and the various power supplies of the integrated circuit comprising at least one connection support.
- the support rests on the integrated circuit by means of an insulating mat, for example an elastomer.
- the main function of the mattress is to absorb the mechanical stresses undergone by the integrated circuit. These constraints are mainly due to the differences in expansion between the silicon and the substrate which receives the CSP when it is subjected to temperature variations.
- the multilayer assembly thus formed constitutes a housing intended to be integrated into an electronic assembly.
- connection support and the integrated circuit respectively on different levels.
- several techniques are known.
- a technique developed by the company under American law TESSERA consists of arranging windows in the connection support, in areas intended to be opposite the connection pads of the integrated circuit.
- the end parts of the conductors are generally arranged at the periphery of the support and are intended to be wired to the connection pads of the integrated circuit.
- connection pads are then individually connected to the connection pads, for example, by an individual weld.
- a first drawback of this technique is that to cause the conductors to break in the right place, namely at the interface between the conductor and the support, typically at the copper / polyimide interface, corresponding to a first window sill , the conductors must include a throttling generally difficult to achieve, typically of the order of 40 to 50 ⁇ m wide in the case of conductors having a width typically of 80 ⁇ m.
- the conductor on the other hand, is widened at the polyimide / copper interface on the window sill, opposite the first sill, to help the bending by beam effect. This widening further reduces the pitch available between conductors.
- the operation is delicate because the bending must not cause an axial deviation of the conductors; the latter being cantilevered after breakage.
- the protection of the conductors is generally ensured by a noble coating such as gold, palladium, etc.
- the first object of the invention is a method of electrical connection between connection pads of an integrated circuit and output terminals of a CSP box, of the type consisting in connecting the connection pads of the integrated circuit to a connection support arranged opposite and at a level different from the connection pads, by means of electrical conductors arranged on the connection support.
- the method consists after having placed the support facing the integrated circuit, to move at least part of the support to bring it in the vicinity of the connection pads of the integrated circuit, and to connect the conductors supported by the part of the support on the connection pads of the integrated circuit.
- the support comprising at least a first part and a second part, separated by a determined space, and connected to each other by the conductors passing through this space, it consists in arching globally and simultaneously the conductors maintained from on either side of the space and crossing this space, to bring the first part of the support in the vicinity of the connection pads of the integrated circuit.
- the end parts of the conductors, supported by the first part of the support are connected globally and simultaneously on the pads of the integrated circuit.
- a second object of the invention is a connection support comprising a plurality of electrical conductors forming a network of conductors on at least one of the faces of the support, and intended to provide the interface between connection pads of an integrated circuit arranged at a different level from the connection support, and from the output terminals of a box containing the integrated circuit in a CSP architecture.
- the support comprises at least a first part, supporting the conductors to be connected on the connection pads of the integrated circuit, and capable of undergoing a difference in level with respect to a second part of the support to position themselves in the vicinity of the pads of integrated circuit connection.
- connection support comprises at least one window, called the bending window, arranged in the support and defining respectively on either side of the bending window, a first part and a second part of the support; the bending window being traversed on either side by conductors held on either side of the bending window and connecting the two parts.
- the bending window defines, in itself, a determined zone corresponding to a bending space of the conductors passing through the bending window; the conductors passing through the bending window being able to deform globally and simultaneously to allow, by a global and simultaneous bending, a difference in level between the first part and the second part of the support lying respectively on either side of the bending window .
- the first part of the support intended to be positioned in the vicinity of the connection pads of the integrated circuit, comprises at least one window, called connection window, arranged in a determined area to be opposite the connection pads; the connection window being traversed by the end parts of the conductors, held on either side of the connection window and able to be simultaneously and globally connected to the connection pads through the connection window.
- the support and the bending and connection windows are of generally rectangular shape, and the bending window occupies substantially all of the bending space inside the support; the side edges of the bending window being respectively parallel to the side edges of the support and as close as possible to the side edges of the support.
- the third object of the invention is a CSP box comprising an integrated circuit, a differential expansion absorber, electrical insulator, disposed on the integrated circuit, and a connection support supporting a plurality of conductors defining a network of conductors on at least one of its faces, arranged on the absorber and providing the interface between the connection pads of the integrated circuit and the output terminals of the housing.
- the support comprises at least a first part resting on the connection pads of the integrated circuit, and at least a second part resting on the absorber.
- the first part and the second part of the support are separated by a window, called a bending window, arranged in the support.
- the bending window is traversed by conductors maintained on either side of the bending window and connecting the first part and the second part of the support.
- the conductors passing through the bending window are deformed by an overall and simultaneous bending to form a difference in height between the first part and the second part of the support.
- the end parts of the conductors, supported by the first part of the support resting on the integrated circuit are respectively connected on pads of the integrated circuit.
- the first part of the support comprises at least one window, called connection window, arranged in a determined area of the first part of the support so as to be opposite the connection pads; the connection window being traversed by conductors maintained on either side of the connection window and respectively connected to the connection pads through the connection window.
- the support and the bending and connection windows are of generally rectangular shape.
- the invention has as its fourth object, an electronic assembly comprising at least one CSP box according to the invention.
- the method according to the invention makes it possible to connect CSP boxes by overall and simultaneous bending of maintained conductors, and then to make an overall and simultaneous connection operation of the conductors with the integrated circuit.
- connection support according to the invention before bending
- connection support according to the invention after bending
- FIG. 3 a view schematically illustrating the connection method according to the invention
- FIG. 4 a perspective view of a CSP housing according to the invention equipped with a network of solder balls;
- FIG. 6 a partial perspective view of an electronic assembly comprising at least one housing according to the invention.
- FIG. 1 illustrates an example of a connection support 1 according to the invention in top view and before trimming.
- the support 1 supports a plurality of conductors 2i defining a network of conductors according to a determined topology on a face 3 of the support 1.
- the support 1 is for example a printed circuit board produced in polyimide or in another type of substrate, flexible or rigid.
- Two series of windows 4i and 5i are arranged in the support 1.
- First series of windows 4i are arranged in the support 1 to correspond to the bending spaces 6i of the conductors 2i. These windows 4i, hereinafter called bending windows, are arranged in the lateral end portions 7i of the support 1 which is of generally rectangular shape in the embodiment described.
- the conductors 2i, forming tracks, pass above the bending windows 4i to respectively form bridges 8i bearing on either side of the bending windows 4L
- connection windows are arranged in determined zones of the support 1 so as to be opposite the connection pads 9i of an integrated circuit 10, shown in FIG. 2, on which must be removed the support 1.
- connection windows 5i extend between the lateral outer edges of the support 1 and the arching windows 4L
- connection window 5i is provided in each end part 7i of the support 1.
- connection windows are respectively arranged in the end parts 7i of the support 1.
- connection windows 5i As for the bending windows 4i, the conductors 2i respectively pass through the connection windows 5i by taking support on either side of the connection windows 5i.
- the bending and connection windows 4i and 5i are of generally rectangular shape and the conductors 2i are of constant width.
- Other forms of windows 4i and 5i and of conductors 2i can also be envisaged without departing from the scope of the present invention.
- the conductors 2i can pass through the windows in different directions.
- the different shapes and dimensions of the conductors 2i and of the windows 4i and 5i depend on the topology of the network of conductors, itself a function of the topology of the integrated circuit 10 and of the interface with the exterior of the box containing the integrated circuit 10 .
- the bending windows 4i are retained from the rest of the support 1 by sections 11 i of the support 1 of small width, which can be precut, and allowing after their rupture, for example by trimming using a determined tool not shown, to separate the end parts 7i of the support 1 comprising the connection windows 5i from the rest of the support 1.
- the width 6i of the bending windows 4i is determined as a function of the angle of inclination of the conductors 2i, typically of the order of 10 ° relative to a vertical plane perpendicular to the plane 3 of the support 1, and of the thickness of a differential expansion absorber 12, electrical insulator, typically of the order of 200 ⁇ m, illustrated in FIG. 2, disposed between the integrated circuit 10 and the support 1.
- the bending of the conductors is determined so as to allow the absorber 12, for example an elastomeric mat, to be inserted between the integrated circuit 10 and the support 1 intended to receive and support a network. 13i solder balls, in a CSP type structure.
- the mattress provides reliability on the card of the order of several hundred thermal cycles between -40 ° C and + 125 ° C for example. It is easy to understand the advantage of the structure according to the invention, because it makes it possible to maintain a constant pitch between the conductors 2i during the bending and connection operations of the conductors 2i on the connection pads 9i of the integrated circuit 10.
- FIG. 2 also schematically illustrates the method of connecting the support 1 according to the invention with an integrated circuit 10.
- the line 1 according to the invention is shown by a dashed line, in its initial position, bearing on the mattress 12, itself bearing on the integrated circuit 10; the mattress 12 leaving the connection pads 9i of the integrated circuit 10 free.
- a tool 14 adapted to the topology of the support 1 and the integrated circuit 10 ensures the overall bending of the conductors 2i in the zones 6i corresponding to the bending windows 4i and the positioning of the end portions 7i of the support 1 on the connection pads 9i of the integrated circuit 10.
- This tool 14 comprises a first movable member or counterplate 15 which is intended to be applied in abutment on free areas 1 Si of the upper face 3 of the support 1 before and during the bending operation.
- It comprises a second movable member 16 which, once the first member 15 bears on the upper face 3 of the support 1, progressively displaces the end parts 7i of the support 1 at the connection pads 9i of the integrated circuit 1.
- the conductors 8i deprived of support inside the arching windows 4i behave like flexible ribbons and are deformed under the effect of the pressure exerted by the second mobile member16 on the end portions 7i of the support 1.
- the deformation is uniform on all the conductors 8i, the end parts 17i of which are held on the end parts 7i of the support 1.
- the bending is carried out on a first level A, at the copper / polyimide interface and on a second level B at the interface second bending member 16 / copper.
- the elasticity of the conductors 8i makes it possible to preserve the bending and the positioning of the end parts 7i of the support 1 on the integrated circuit 10, after the withdrawal of the tool 14.
- the bending can be carried out beforehand, before positioning the support 1 on the integrated circuit 10.
- connection pads 9i of the integrated circuit 10 are then punctually connected to the connection pads 9i by spot welding, for example, or connected globally to the pads 9i by a tool, not shown, taking into account all of the conductors to be connected on pads 9i, at their end portions 17L
- the punctual or global connection operation can be carried out by an independent tool, not shown, or by the same tool 14 having carried out the overall bending.
- FIG. 4 illustrates in a perspective view, a CSP box 18 according to the invention, comprising a support 1 according to the invention connected to the integrated circuit 10 according to the method according to the invention.
- Figure 5 illustrates a sectional view of the housing 18 of Figure 4 along the cutting axis v-v.
- the housing 18 includes an integrated circuit 10, an electrical insulating mattress 12, supported on the integrated circuit 10, a support 1 of electrical conductors 2i, supported on the mattress 12 and on the integrated circuit 10, ensuring the electrical connection between a network of balls 13i welded on the conductors 2i and the connection pads 9i of the integrated circuit 10 via the end portions 17i of the conductors 2L
- the support 1 is divided into three parts: first lateral parts 7i distributed on either side of a second part 7, or central part of the support 1.
- the first lateral parts 7i are distributed substantially symmetrically with respect to a median axis of the central part 7 of the support 1, and corresponds substantially to the median axis of the housing 18.
- Figure 6 illustrates in a partial perspective view, an electronic assembly 19 materialized by a card 20 on a face 21 of which are mounted CSP 18i boxes according to the invention; the connection of the CSP 18i boxes on the card 20 being carried out by the balls 13L
- the invention can be applied to the connection of any passive or active electronic function such as memory, processor, etc., compatible with CSP architectures.
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Power Engineering (AREA)
- Structures For Mounting Electric Components On Printed Circuit Boards (AREA)
- Coupling Device And Connection With Printed Circuit (AREA)
- Combinations Of Printed Boards (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99909071A EP1027731A2 (fr) | 1998-03-24 | 1999-03-22 | Procede de liaison et support de connexion d'un boitier csp avec un circuit integre |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9803602A FR2776836A1 (fr) | 1998-03-24 | 1998-03-24 | Procede de liaison et support de connexion d'un boitier csp avec un circuit integre |
FR98/03602 | 1998-03-24 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO1999049499A2 true WO1999049499A2 (fr) | 1999-09-30 |
WO1999049499A3 WO1999049499A3 (fr) | 2000-06-15 |
Family
ID=9524420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1999/000669 WO1999049499A2 (fr) | 1998-03-24 | 1999-03-22 | Procede de liaison et support de connexion d'un boitier csp avec un circuit integre |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1027731A2 (fr) |
FR (1) | FR2776836A1 (fr) |
WO (1) | WO1999049499A2 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10005494A1 (de) * | 2000-02-08 | 2001-08-16 | Infineon Technologies Ag | Elektronisches Bauteil und Verfahren zur Herstellung des Bauteils |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5258330A (en) * | 1990-09-24 | 1993-11-02 | Tessera, Inc. | Semiconductor chip assemblies with fan-in leads |
JPH0637233A (ja) * | 1992-07-16 | 1994-02-10 | Hitachi Ltd | 半導体集積回路装置およびその製造方法 |
US5602419A (en) * | 1993-12-16 | 1997-02-11 | Nec Corporation | Chip carrier semiconductor device assembly |
-
1998
- 1998-03-24 FR FR9803602A patent/FR2776836A1/fr not_active Withdrawn
-
1999
- 1999-03-22 WO PCT/FR1999/000669 patent/WO1999049499A2/fr not_active Application Discontinuation
- 1999-03-22 EP EP99909071A patent/EP1027731A2/fr not_active Withdrawn
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5258330A (en) * | 1990-09-24 | 1993-11-02 | Tessera, Inc. | Semiconductor chip assemblies with fan-in leads |
JPH0637233A (ja) * | 1992-07-16 | 1994-02-10 | Hitachi Ltd | 半導体集積回路装置およびその製造方法 |
US5602419A (en) * | 1993-12-16 | 1997-02-11 | Nec Corporation | Chip carrier semiconductor device assembly |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 018, no. 255 (E-1548), 16 mai 1994 (1994-05-16) -& JP 06 037233 A (HITACHI LTD;OTHERS: 01), 10 février 1994 (1994-02-10) * |
Also Published As
Publication number | Publication date |
---|---|
FR2776836A1 (fr) | 1999-10-01 |
WO1999049499A3 (fr) | 2000-06-15 |
EP1027731A2 (fr) | 2000-08-16 |
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