WO2019066902A1 - Pillar array plate - Google Patents

Pillar array plate Download PDF

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Publication number
WO2019066902A1
WO2019066902A1 PCT/US2017/054315 US2017054315W WO2019066902A1 WO 2019066902 A1 WO2019066902 A1 WO 2019066902A1 US 2017054315 W US2017054315 W US 2017054315W WO 2019066902 A1 WO2019066902 A1 WO 2019066902A1
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WO
WIPO (PCT)
Prior art keywords
interface
routing layer
integrated circuit
contact points
package
Prior art date
Application number
PCT/US2017/054315
Other languages
French (fr)
Inventor
Khang Choong YONG
Min Suet LIM
Eng Huat Goh
Wil Choon SONG
Boon Ping Koh
Original Assignee
Intel Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Intel Corporation filed Critical Intel Corporation
Priority to PCT/US2017/054315 priority Critical patent/WO2019066902A1/en
Publication of WO2019066902A1 publication Critical patent/WO2019066902A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
    • H01L23/538—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames the interconnection structure between a plurality of semiconductor chips being formed on, or in, insulating substrates
    • H01L23/5384—Conductive vias through the substrate with or without pins, e.g. buried coaxial conductors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
    • H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
    • H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
    • H01L21/48—Manufacture or treatment of parts, e.g. containers, prior to assembly of the devices, using processes not provided for in a single one of the subgroups H01L21/06 - H01L21/326
    • H01L21/4814—Conductive parts
    • H01L21/4846—Leads on or in insulating or insulated substrates, e.g. metallisation
    • H01L21/486—Via connections through the substrate with or without pins
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/12—Mountings, e.g. non-detachable insulating substrates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
    • H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
    • H01L23/49827—Via connections through the substrates, e.g. pins going through the substrate, coaxial cables
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/48—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor
    • H01L23/488—Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads, terminal arrangements ; Selection of materials therefor consisting of soldered or bonded constructions
    • H01L23/498—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers
    • H01L23/49833—Leads, i.e. metallisations or lead-frames on insulating substrates, e.g. chip carriers the chip support structure consisting of a plurality of insulating substrates
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
    • H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/10—Bump connectors; Manufacturing methods related thereto
    • H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
    • H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
    • H01L2224/161—Disposition
    • H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
    • H01L2224/26—Layer connectors, e.g. plate connectors, solder or adhesive layers; Manufacturing methods related thereto
    • H01L2224/31—Structure, shape, material or disposition of the layer connectors after the connecting process
    • H01L2224/32—Structure, shape, material or disposition of the layer connectors after the connecting process of an individual layer connector
    • H01L2224/321—Disposition
    • H01L2224/32151—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
    • H01L2224/32221—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
    • H01L2224/32225—Disposition the layer connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
    • H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
    • H01L2224/732—Location after the connecting process
    • H01L2224/73201—Location after the connecting process on the same surface
    • H01L2224/73203—Bump and layer connectors
    • H01L2224/73204—Bump and layer connectors the bump connector being embedded into the layer connector
    • 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
    • H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
    • H01L2924/151—Die mounting substrate
    • H01L2924/153—Connection portion
    • H01L2924/1531—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface
    • H01L2924/15311—Connection portion the connection portion being formed only on the surface of the substrate opposite to the die mounting surface being a ball array, e.g. BGA

Definitions

  • HSIO connections higher speed input/output connections
  • Gbps gigabytes per second
  • HSIO connections between an integrated circuit chip package and a substrate are generally in the form of a solder ball between corresponding contact points or pads of the package and the substrate.
  • a significant amount of ground isolation connections are inserted between these HSIO connections (e.g., solder balls). These ground isolation connections are generally also in the form of solder balls.
  • Such design implementation poses significant challenges to achieve a smaller competitive form factor.
  • Figure 1 shows a cross-sectional side view of an integrated circuit assembly.
  • Figure 2 shows a cross-sectional side view of the interface or pillar array plate of the integrated circuit assembly of Figure 1 isolated from the other structures of the assembly.
  • Figure 3 shows a top view of the interface of Figure 1 isolated from the other structures of the assembly.
  • Figure 4 shows another embodiment of an integrated circuit assembly.
  • Figure 5 shows a cross-sectional side view of the interface of Figure 4 isolated from the other structure of the assembly.
  • Figure 6 shows a cross-sectional side view of another embodiment of an integrated circuit assembly.
  • Figure 7 shows a cross-sectional side view of the interface of the assembly of Figure 6 isolated from the other structures of the assembly.
  • Figure 8 shows the process of forming a body of an interface.
  • Figure 9 shows the structure of Figure 8 after forming openings through the body.
  • Figure 10 shows the structure of Figure 9 following the lining of the openings through the interface body with a conductive material.
  • Figure 11 shows the structure of Figure 10 patterned to receive an electrically conductive material in the openings to form pillars.
  • Figure 12 shows the structure of Figure 11 following formation of pillars in the interface.
  • Figure 13 presents a flow chart of a process of forming an interface.
  • Figure 14 illustrates an embodiment of a computing device.
  • Described herein are systems, methods, and apparatuses for fabricating and utilizing an interface or pillar array plate between a chip or die package (e.g., central processing unit (CPU) die packages) and a substrate such as a printed circuit board (e.g., a motherboard).
  • a chip or die package e.g., central processing unit (CPU) die packages
  • a substrate such as a printed circuit board (e.g., a motherboard).
  • embodiments further include various operations which are described below.
  • the operations described in accordance with such embodiments may be performed by hardware components or may be embodied in machine-executable instructions, which may be used to cause a general-purpose or special-purpose processor programmed with the instructions to perform the operations.
  • the operations may be performed by a combination of hardware and software.
  • any of the disclosed embodiments may be used alone or together with one another in any combination.
  • various embodiments may have been partially motivated by deficiencies with conventional techniques and approaches, some of which are described or alluded to within the specification, the embodiments need not necessarily address or solve any of these deficiencies, but rather, may address only some of the deficiencies, address none of the deficiencies, or be directed toward different deficiencies and problems which are not directly discussed.
  • an integrated circuit interface or pillar array plate or interposer is described.
  • the interface is operable to be disposed between an integrated circuit package and a substrate such as a printed circuit board.
  • the integrated circuit interface includes a body including a plurality of openings from a first side of the body to an opposite second side.
  • An electrically conductive material such as solder is disposed in respective ones of the openings to define interface contact points on a surface of first side of the body operable for connecting contact points of the integrated circuit package and interface contact points on a surface of a second side of the body operable for connecting the contact points on the substrate (e.g., printed circuit board).
  • the interface is composed of a relatively thin body with the electrically conductive material disposed in the form of pillars through openings in the body to provide second level interconnect (SLI) connections between the package and the substrate (e.g., motherboard) while acting as a Vss shield/isolation for HSIO.
  • the pillars of electrically conductive material through the body of the interface are of different sizes. Such sizes include, for example, first diameter pillars for Vss or ground isolation and second larger diameter pillars for I/O (e.g., HSIO) and Vcc or power.
  • the interface may provide additional routing layers to connect components thereto in addition to a package or packages (e.g., capacitors, resistors, oscillators) on a printed circuit board.
  • an integrated circuit assembly in another embodiment, includes at least one package including an integrated circuit chip and a substrate (e.g., a printed circuit board). Disposed between the package and the substrate is an interface such as described above providing electrical connections between the at least one package and the printed circuit board.
  • a method of forming an integrated circuit assembly includes positioning an interface between an integrated circuit package and a substrate (e.g., printed circuit board) wherein the interface includes a body including a plurality of openings therethrough and electrically conductive material as pillars in ones of the plurality of openings. The pillars define interface contact points on opposite sides of the body of the interface. The method also includes connected the contact points to respective ones of the contact points on the integrated circuit package and the contact points on the substrate.
  • an interface into an assembly including at least one package and a substrate such as a printed circuit board allows for device form factor miniarization through avoidance of growing package form factor with the increased numbers of Vss isolation balls for HSIO.
  • the interface also reduces costs through avoidance of expensive motherboard solutions by providing efficient routing layers in the interface where desired to adjacent components or secondary devices (e.g., passive devices) thus eliminating the need to increase board conductive layer count for HSIO routing.
  • an interface as described provides improved electrical performance by reducing crosstalk with better ground isolation and inhibits solder bridging through the use of controlled pre-solder interconnections.
  • the interface has a relatively neutral net z-height and form factor xy increase by only reclaiming unutilized space/volume within a ball grid array (BGA) area under a package shadow.
  • BGA ball grid array
  • Figure 1 shows a cross-sectional side view of an integrated circuit assembly.
  • Assembly 100 includes package 105 including integrated circuit chip 110 that is, for example, a processor (e.g., central processing unit) connected to package substrate 120 through, for example, solder connection 115 deposited onto contact points or pads of the chip (e.g., flip chip packaging).
  • package substrate 120 includes contact points or pads 125 disposed on a side opposite the side to which chip 110 is connected thereto.
  • Assembly 100 also includes substrate 130 that is, for example, a printed circuit board (e.g., a motherboard) having contact points 135 thereon. Disposed between package 105 and substrate 130 is interface 140. Interface 140 includes body 1405 that has a z-dimension thickness that is less than a z-dimension thickness of substrate 130 and has electrically conductive material pillars disposed in openings through the body. Pillars 1410 and 1420 define interface contact points at their opposite ends to connect contact points or pads 125 of package 105 to contact points or pads 135 of substrate 130. In one embodiment, pillars 1410 have a smaller diameter than pillars 1420.
  • Pillars 1410 may be used, for example, for Vss or ground connections (e.g., isolation) and pillars 1420 may be used for I/O (e.g., HSIO) and Vcc or power connections.
  • one of pillars 1420 is positioned between at least two of pillars 1410.
  • the pillars can be the diameter of the ball pads sizes in the package.
  • an exemplary diameter range is on the order of 200 microns ( ⁇ ) to 400 ⁇ and smaller pillars for ground such as pillars 1420 can be in the range of 80 ⁇ tol50 ⁇ .
  • Figure 2 shows the interface of integrated circuit assembly 100.
  • FIG. 3 shows a top view of the interface of Figure 2.
  • Interface 140 includes body 1405.
  • body 1405 of interface 140 is a composed of printed circuit material such as solder resist and FR-4 glass epoxy.
  • Body 1405 has a thickness, t, representatively on the order of a z-dimension height of SLI ranging from about 100 microns ( ⁇ ) to 300 ⁇ .
  • electrically conductive layer 145 of, for example, a copper sheet that may be patterned.
  • Body 1405 may be formed by laminating conductive layer 145 to a first layer of insulating material such as SR-4 glass epoxy and then laminating a second layer of insulating material to conductive layer 145 to embed the conductive layer.
  • body 1405 of interface 140 has a number of openings therethrough.
  • the openings are disposed in a direction generally perpendicular to a plane of conductive layer 145.
  • an electrically conductive material such as solder that define pillars or posts extending from one side of the body to the other.
  • Figure 2 and Figure 3 show that the openings, in one embodiment, may have different dimensions depending, for example, on the purpose of the pillar formed therein.
  • Figures 1-3 show pillars 1410 and pillars 1420 through the openings with each pillar defining interface contact points on opposing sides of body 1405 of the interface.
  • pillars 1420 have a diameter, Di, that is greater than a diameter, D 2 , of pillars 1410. A diameter of the pillars is defined by the openings.
  • the openings into which electrically conductive material is introduced to form pillars 1410 and 1420 are lined with an electrically conductive material 148 such as copper.
  • electrically conductive material 148 that lines openings for pillars 1410 where pillars 1410 are designated as Vss or ground pillars are connected to conductive layer 145 disposed in body 1405 of interface 140 as, for example, a ground plane.
  • pillars 1420 are isolated from conductive layer 145 as shown in Figure 1 and Figure 2.
  • the openings through body 1405 of interface 140 are not lined or are lined with an insulating material that would isolate pillars 1420 from conductive layer 145.
  • FIG. 140 shows an assembly including one package connected to substrate 130. In another embodiment, more than one package may be connected to substrate 130. In such instance, a single interface may be disposed between multiple packages and substrate 130.
  • each of pillars 1410 are connected to contact points 125 of package substrate 120 and contact points 135 of substrate 130 through a direct connection (i.e., one end of each pillar is connected to one of contact points 125 of the package and the other end to one of contact points 135 of substrate 130).
  • pillars 1420 are connected to respective contact points 125 of package substrate 120 and contact points 135 of substrate 130.
  • pillars 1410 are operable or designated for providing Vss or ground, isolation or connection
  • a direct connection by a pillar to contact points on each of a package substrate and another substrate such as a printed circuit board is not necessary.
  • Figure 4 shows another embodiment of an integrated circuit assembly.
  • Assembly 200 includes package 205 including die 210 that is, for example, a processor (e.g., CPU) attached to package substrate 220 through solder connections 215 between contact points of the structures.
  • Package 205 is connected to substrate 230 that is, for example, a printed circuit board 230.
  • interface 240 Disposed between package 205 and substrate 230 is interface 240.
  • Figure 5 shows a cross-sectional side view of the interface of Figure 4 isolated from the other structures of the assembly.
  • interface 240 includes body 2405 that includes conductive layer 245 encapsulated by an electrically insulated material such as SF-4 glass epoxy.
  • Conductive layer 245 is an electrically conductive material such as copper.
  • FIG. 2405 Disposed through body 2405 are openings through which electrically conductive material pillars are formed defining contact points on opposite sides of the body.
  • Figure 4 and Figure 5 shows pillars of various sizes selected, in one embodiment, for the routing purpose such pillars provide.
  • Figure 5 shows pillars 2410 that, in this embodiment, are designated for Vss or ground connection between package 205 and substrate 230; pillars 2420 designated for I/O connection between package 205 and substrate 230; pillar 2425 designed for a Vcc connection between package 205 and substrate 230; and pillar 2415 designated for a Vss or ground connection between package 205 and substrate 230.
  • pillars 2410 have a smaller diameter than a diameter of pillars 2420 or a diameter of pillar 2425.
  • each of pillars 2410 and pillar 2415 is connected to conductive layer 245 in interface 240 while pillars 2420 and pillar 2425 are not.
  • pillars 2410 are electrically ganged with pillar 2415.
  • each of pillars 2410 are connected to respective ones of contact points or pads 225 of package 205 but these pillars are not connected to corresponding contact pads on substrate 230.
  • pillar 2415 that, in one embodiment, has a larger diameter than a diameter of pillars 2410 serves as a single connection to substrate 230 for several connections (no solder resist opening of pillars 2410 to substrate 230).
  • Figure 6 shows a cross-sectional side view of another embodiment of an integrated circuit assembly.
  • Assembly 300 includes package 305 including die 310 that is, for example, a processor connected to package substrate 320 through electrically conductive contacts 315 (e.g., solder connections).
  • Package 305 is connected to interface 340 on a side opposite die 310 and interface 340 is connected to substrate 330 that is, for example, a printed circuit board (e.g., motherboard).
  • Figure 7 shows a cross-sectional side view of interface 340 of assembly 300 isolated from the other structures of the assembly.
  • interface 340 includes electrically conductive material formed through openings through body 3405 of interface 340 to define interface contact points on opposite sides of the body.
  • the electrically conductive material defines pillars 3420 that are connected to contact points 325 of package 320 and contact points 335 of substrate 330. As before the pillars may have a diameter selected for a purpose to be served by the pillar. In one embodiment, pillars 3420 are designated to bring I/O signals between package 305 and substrate 330.
  • the electrically conductive material through openings in body 3405 of interface 340 also define pillars 3415 and 3425 configured as Vss or ground and Vcc or power connections, respectively, between package 305 and substrate 330.
  • interface 340 includes multiple conductive layers within body
  • the multiple layers are two layers identified as electrically conductive layer 345 and layer 348, each of, for example, copper and each extending in a direction generally perpendicular to the pillars. As shown, each of the conductive layers may be patterned.
  • Figures 6 and 7 show a portion of layer 345 connected or in contact with pillar 3415 to form a Vss or ground connection and a portion of layer 348 connected to pillar 3425 to form a Vcc or power connection.
  • disposed on a surface of interface 340 adjacent to package 305 is one or more board edge capacitors 350 as one form of secondary devices that may be connected to an assembly.
  • one or more board edge capacitors 350 are connected to pillars 3430 and 3435 that provide Vcc and Vss connections to the one or more capacitors, respectively.
  • interface 340 provides power and ground for secondary devices such as one or more board edge capacitors 350, without requiring such power and ground lines, be disposed in substrate 330.
  • Figure 6 also shows secondary device 360 that is, for example, a resistor, filter or oscillator. Secondary device 360 may be routed to other components in or through interface 340 rather than in or through substrate 330.
  • Figures 8-12 describe a process of forming an interface having pillars of electrically conductive material defining interface contact points on opposite sides of a body of the interface.
  • Figure 13 presents a flow chart of a process of forming an interface. Referring to Figure 8 and Figure 13, the process begins by forming a body of the interface (block 510, Figure 13).
  • interface 440 includes body 4405 made up of one inner electrically conductive layers encapsulated on opposite sides by a dielectric material such as SR-4 glass epoxy material.
  • Figure 8 shows electrically conductive layer 445 is, for example, a copper material that may be in the form of a sheet and optionally patterned as desired.
  • Figure 9 shows the structure of Figure 8 following the forming of openings through the interface (block 520, Figure 13).
  • the openings may be made according to techniques to form openings in printed circuit boards such as by punching or drilling opening or a PCB riveting process.
  • the openings through body 4405 of interface 440 can have different diameters selected, in one embodiment, for the purpose of the electrical connection formed through the opening.
  • Figure 9 shows body 4405 having opening 446A having a diameter, Di, that is greater than diameter, D 2 , of opening 446B.
  • Figure 10 shows the structure of Figure 9 following the optional lining of the openings through the interface body with a material (block 530, Figure 13).
  • suitable material for lining the openings is a copper material.
  • Figure 10 shows lining layer 448 lining an inside of the openings.
  • a lining of a copper material may be done by a plating process wherein, for example, the walls of each opening are seeded with a copper seed material then followed by an electroplating process to deposit a copper material on the side walls of the opening.
  • Figure 11 shows the structure of Figure 10 patterned to receive an electrically conductive material to form pillars in the the openings.
  • body 4405 of interface 440 is placed on base or support 460 and an opposite side of the body is masked with masking material 470 (e.g., a photoresist) leaving the openings exposed. With the mask in place and the interface supported, a controlled volume of an electrically conductive material may be introduced into the openings to fill the openings.
  • the electrically conductive material is a pre-solder.
  • Figure 12 shows the structure of Figure 11 following the filling of the openings in interface 440 to form pillars (block 540, Figure 13).
  • the electrically conductive material is a pre-solder
  • such pre-solder may be introduced to fill the openings.
  • Mask 470 may then be removed and then a reflow process at an elevated temperature is performed followed by cooling process to solidify the electrically conductive material in the openings and form the final structure.
  • Figure 14 illustrates computing device 600 in accordance with one implementation.
  • Computing device 600 houses board 602.
  • Board 602 may include a number of components, including but not limited to processor 604 and at least one communication chip 606.
  • Processor 604 of computing device 600 includes an integrated circuit die packaged within processor 604.
  • the integrated circuit die of the processor includes one or more devices.
  • Communication chip 606 also includes an integrated circuit die packaged within communication chip 606.
  • Processor 604 is physically and electrically coupled to board 602.
  • at least one communication chip 606 is also physically and electrically coupled to board 602 utilizing an interface as described.
  • communication chip 606 is part of processor 604.
  • computing device 600 may include other components that may or may not be physically and electrically coupled to board 602. These other components include, but are not limited to, volatile memory (e.g., DRAM), non-volatile memory (e.g., ROM), flash memory, a graphics processor, a digital signal processor, a crypto processor, a chipset, an antenna, a display, a touchscreen display, a touchscreen controller, a battery, an audio codec, a video codec, a power amplifier, a global positioning system (GPS) device, a compass, an accelerometer, a gyroscope, a speaker, a camera, and a mass storage device (such as hard disk drive, compact disk (CD), digital versatile disk (DVD), and so forth).
  • volatile memory e.g., DRAM
  • non-volatile memory e.g., ROM
  • flash memory e.g., a graphics processor, a digital signal processor, a crypto processor, a chipset, an antenna, a display
  • Communication chip 606 enables wireless communications for the transfer of data to and from computing device 600.
  • wireless and its derivatives may be used to describe circuits, devices, systems, methods, techniques, communications channels, etc., that may communicate data through the use of modulated electromagnetic radiation through a non-solid medium. The term does not imply that the associated devices do not contain any wires, although in some embodiments they might not.
  • Communication chip 606 may implement any of a number of wireless standards or protocols, including but not limited to Wi-Fi (IEEE 802.11 family), WiMAX (IEEE 802.16 family), IEEE 802.20, long term evolution (LTE), Ev-DO, HSPA+, HSDPA+, HSUPA+, EDGE, GSM, GPRS, CDMA, TDMA, DECT, Bluetooth, derivatives thereof, as well as any other wireless protocols that are designated as 3G, 4G, 5G, and beyond.
  • Computing device 600 may include a plurality of communication chips 606. For instance, first communication chip 606 may be dedicated to shorter range wireless communications such as Wi-Fi and Bluetooth and second
  • communication chip 606 may be dedicated to longer range wireless communications such as GPS, EDGE, GPRS, CDMA, WiMAX, LTE, Ev-DO, and others.
  • processor may refer to any device or portion of a device that processes electronic data from registers and/or memory to transform that electronic data into other electronic data that may be stored in registers and/or memory.
  • computing device 600 may be a laptop, a netbook, a notebook, an ultrabook, a smartphone, a tablet, a personal digital assistant (PDA), an ultra mobile PC, a mobile phone, a desktop computer, a server, a printer, a scanner, a monitor, a set-top box, an entertainment control unit, a digital camera, a portable music player, or a digital video recorder.
  • computing device 600 may be any other electronic device that processes data.
  • Example 1 is an integrated circuit assembly including a package including an integrated circuit chip; a printed circuit board; and an interface between the package and the printed circuit board, wherein the interface includes a body including a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface, the contact points connected to contact points on the package and contact points on the printed circuit board.
  • Example 2 the electrically conductive material of the integrated circuit assembly of Example 1 includes solder.
  • Example 3 the plurality of openings of the integrated circuit assembly of Example
  • 1 includes openings of different sizes.
  • Example 4 a first set of the interface contact points are designated ground contact points and a second set of the interface contact points are designated input/output contact points of the integrated circuit assembly of any of Examples 1-3, wherein a diameter of the first set of the interface contact points and is less than a diameter of the second set of the interface contact points.
  • Example 5 ones of the second set of interface contact points of the integrated circuit assembly of Example 4 are positioned between ones of the first set of interface contact points.
  • Example 6 the body of the interface of the integrated circuit assembly of any of Examples 1-6 includes at least one routing layer therein.
  • Example 7 the interface of the integrated circuit assembly of Example 6 further includes at least one routing layer contact on a surface of the body of the interface and connected to the at least one routing layer.
  • the body of the interface of the integrated circuit assembly of Example 7 includes an area dimension greater than an area of the package and the at least one routing layer contact is positioned on the surface of the body of the interface in an area outside an area occupied by the package.
  • Example 9 the at least one routing layer of the integrated circuit assembly of
  • Example 7 includes a power routing layer and a ground routing layer and the at least one routing layer contact includes a power routing layer contact connected to the power routing layer and a ground routing layer contact connected to the ground routing layer.
  • Example 10 is an integrated circuit interface including a body including a plurality of openings from a first side of the body to an opposite second side; electrically conductive material in respective ones of the openings defining interface contact points on a first side of the body of the interface operable for connection to contact points of an integrated circuit package and interface contact points on a second side of the body of the interface operable for connection to contact points on a substrate.
  • Example 11 the electrically conductive material of the integrated circuit interface of Example 10 includes solder.
  • the electrically conductive material of the integrated circuit interface of Example 11 includes a first electrically conductive material and the plurality of openings are lined with a second electrically conductive material that is different than the first electrically conductive material.
  • Example 13 the plurality of openings of the integrated circuit interface of Example 10 or 11 includes openings of different sizes.
  • Example 14 a first set of the interface contact points are designated ground contact points and a second set of the interface contact points are designated input/output contact points of the integrated circuit interface of Example 10, wherein a diameter of the first set of the interface contact points and is less than a diameter of the second set of the interface contact points.
  • ones of the second set of interface contact points of the integrated circuit interface of Example 14 are positioned between ones of the first set of interface contact points.
  • Example 16 the body of the integrated circuit interface of Example 10 includes at least one routing layer therein.
  • Example 17 the interface of the integrated circuit interface of Example 16 further includes at least one routing layer contact on a surface of the body and connected to the at least one routing layer.
  • the body of the integrated circuit interface of Example 17 includes an area dimension greater than an area of an integrated circuit package to which the contact points on the first side of the body are operable for connection and the at least one routing layer contact is positioned on the surface of the body in an area outside an area to be occupied by the integrated circuit package.
  • the at least one routing layer of the integrated circuit interface of Example 17 includes a power routing layer and a ground routing layer and the at least one routing layer contact includes a power routing layer contact connected to the power routing layer and a ground routing layer contact connected to the ground routing layer.
  • Example 20 is a method of forming an integrated circuit assembly including positioning an interface between an integrated circuit package and a substrate, wherein the interface includes a body including a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface; connecting the interface contact points to respective ones of contacts points on the integrated circuit package and on the substrate.
  • connecting in the method of Example 20 includes thermal compression bonding.
  • the body of the interface in the method of Example 20 or 21 includes at least one routing layer therein and at least one routing layer contact on a surface of the body and connected to the at least one routing layer, the method further including connecting a device to the at least one routing layer contact.
  • the body of the interface in the method of Example 22 includes an area dimension greater than an area of the integrated circuit package and the at least one routing layer contact is positioned on the surface of the body in an area outside an area occupied by the integrated circuit package.
  • the at least one routing layer in the method of Example 23 includes a power routing layer and a ground routing layer and the at least one routing layer contact includes a power routing layer contact connected to the power routing layer and a ground routing layer contact connected to the ground routing layer.

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Abstract

An integrated circuit assembly including a package; a printed circuit board; and an interface between the package and the printed circuit board, wherein the interface includes a body including a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body, the contact points coupled to contact points on the package and the printed circuit board. A method of forming an integrated circuit assembly including positioning an interface between an integrated circuit package and a substrate, wherein the interface includes a body including a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface; coupling the interface contact points to respective ones of contacts points on the integrated circuit package and on the substrate.

Description

PILLAR ARRAY PLATE
BACKGROUND
Field
Integrated circuit packing and mounting.
Description of Related Art
Mobile platform design calls for higher speed input/output connections (HSIOs) to be integrated into a small package form factor (e.g., interfaces operating at 10 gigabytes per second (Gbps) or 20 Gbps). HSIO connections between an integrated circuit chip package and a substrate (e.g., a printed circuit board) are generally in the form of a solder ball between corresponding contact points or pads of the package and the substrate. To address crosstalk concern, a significant amount of ground isolation connections are inserted between these HSIO connections (e.g., solder balls). These ground isolation connections are generally also in the form of solder balls. Such design implementation poses significant challenges to achieve a smaller competitive form factor.
Current board edge capacitor implementation poses signal integrity degradation risks to HSIOs due to split power referencing. With a power plane routed to capacitors on a surface of a printed circuit board and its ground return plane on a conductive layer below (e.g., a surface- 1 layer), output/input (I/O) signal breakout is then relogated to a lower level (e.g., L3) in contrast to earlier implementations with I/O routing at a higher level (e.g., L2). This relogation adds additional conductive layers to a printed circuit board stack up resulting in higher manufacturing costs.
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a cross-sectional side view of an integrated circuit assembly.
Figure 2 shows a cross-sectional side view of the interface or pillar array plate of the integrated circuit assembly of Figure 1 isolated from the other structures of the assembly.
Figure 3 shows a top view of the interface of Figure 1 isolated from the other structures of the assembly.
Figure 4 shows another embodiment of an integrated circuit assembly.
Figure 5 shows a cross-sectional side view of the interface of Figure 4 isolated from the other structure of the assembly.
Figure 6 shows a cross-sectional side view of another embodiment of an integrated circuit assembly. Figure 7 shows a cross-sectional side view of the interface of the assembly of Figure 6 isolated from the other structures of the assembly.
Figure 8 shows the process of forming a body of an interface.
Figure 9 shows the structure of Figure 8 after forming openings through the body. Figure 10 shows the structure of Figure 9 following the lining of the openings through the interface body with a conductive material.
Figure 11 shows the structure of Figure 10 patterned to receive an electrically conductive material in the openings to form pillars.
Figure 12 shows the structure of Figure 11 following formation of pillars in the interface.
Figure 13 presents a flow chart of a process of forming an interface.
Figure 14 illustrates an embodiment of a computing device.
DETAILED DESCRIPTION
Described herein are systems, methods, and apparatuses for fabricating and utilizing an interface or pillar array plate between a chip or die package (e.g., central processing unit (CPU) die packages) and a substrate such as a printed circuit board (e.g., a motherboard).
In the following description, numerous specific details are set forth such as examples of specific systems, languages, components, etc., in order to provide a thorough
understanding of the various embodiments. It will be apparent, however, to one skilled in the art that these specific details need not be employed to practice the embodiments disclosed herein. In other instances, well known materials or methods have not been described in detail in order to avoid unnecessarily obscuring the disclosed embodiments.
In addition to various hardware components depicted in the figures and described herein, embodiments further include various operations which are described below. The operations described in accordance with such embodiments may be performed by hardware components or may be embodied in machine-executable instructions, which may be used to cause a general-purpose or special-purpose processor programmed with the instructions to perform the operations. Alternatively, the operations may be performed by a combination of hardware and software.
Any of the disclosed embodiments may be used alone or together with one another in any combination. Although various embodiments may have been partially motivated by deficiencies with conventional techniques and approaches, some of which are described or alluded to within the specification, the embodiments need not necessarily address or solve any of these deficiencies, but rather, may address only some of the deficiencies, address none of the deficiencies, or be directed toward different deficiencies and problems which are not directly discussed.
In one embodiment, an integrated circuit interface or pillar array plate or interposer is described. The interface is operable to be disposed between an integrated circuit package and a substrate such as a printed circuit board. The integrated circuit interface includes a body including a plurality of openings from a first side of the body to an opposite second side. An electrically conductive material such as solder is disposed in respective ones of the openings to define interface contact points on a surface of first side of the body operable for connecting contact points of the integrated circuit package and interface contact points on a surface of a second side of the body operable for connecting the contact points on the substrate (e.g., printed circuit board). In one embodiment, the interface is composed of a relatively thin body with the electrically conductive material disposed in the form of pillars through openings in the body to provide second level interconnect (SLI) connections between the package and the substrate (e.g., motherboard) while acting as a Vss shield/isolation for HSIO. The pillars of electrically conductive material through the body of the interface, in one embodiment, are of different sizes. Such sizes include, for example, first diameter pillars for Vss or ground isolation and second larger diameter pillars for I/O (e.g., HSIO) and Vcc or power. In another embodiment, the interface may provide additional routing layers to connect components thereto in addition to a package or packages (e.g., capacitors, resistors, oscillators) on a printed circuit board.
In another embodiment, an integrated circuit assembly is disclosed that includes at least one package including an integrated circuit chip and a substrate (e.g., a printed circuit board). Disposed between the package and the substrate is an interface such as described above providing electrical connections between the at least one package and the printed circuit board. Further, a method of forming an integrated circuit assembly is disclosed. A method includes positioning an interface between an integrated circuit package and a substrate (e.g., printed circuit board) wherein the interface includes a body including a plurality of openings therethrough and electrically conductive material as pillars in ones of the plurality of openings. The pillars define interface contact points on opposite sides of the body of the interface. The method also includes connected the contact points to respective ones of the contact points on the integrated circuit package and the contact points on the substrate. The incorporation of an interface into an assembly including at least one package and a substrate such as a printed circuit board allows for device form factor miniarization through avoidance of growing package form factor with the increased numbers of Vss isolation balls for HSIO. The interface also reduces costs through avoidance of expensive motherboard solutions by providing efficient routing layers in the interface where desired to adjacent components or secondary devices (e.g., passive devices) thus eliminating the need to increase board conductive layer count for HSIO routing. Further, an interface as described provides improved electrical performance by reducing crosstalk with better ground isolation and inhibits solder bridging through the use of controlled pre-solder interconnections. Further, in one embodiment, the interface has a relatively neutral net z-height and form factor xy increase by only reclaiming unutilized space/volume within a ball grid array (BGA) area under a package shadow.
Figure 1 shows a cross-sectional side view of an integrated circuit assembly.
Assembly 100 includes package 105 including integrated circuit chip 110 that is, for example, a processor (e.g., central processing unit) connected to package substrate 120 through, for example, solder connection 115 deposited onto contact points or pads of the chip (e.g., flip chip packaging). Package substrate 120 includes contact points or pads 125 disposed on a side opposite the side to which chip 110 is connected thereto.
Assembly 100 also includes substrate 130 that is, for example, a printed circuit board (e.g., a motherboard) having contact points 135 thereon. Disposed between package 105 and substrate 130 is interface 140. Interface 140 includes body 1405 that has a z-dimension thickness that is less than a z-dimension thickness of substrate 130 and has electrically conductive material pillars disposed in openings through the body. Pillars 1410 and 1420 define interface contact points at their opposite ends to connect contact points or pads 125 of package 105 to contact points or pads 135 of substrate 130. In one embodiment, pillars 1410 have a smaller diameter than pillars 1420. Pillars 1410 may be used, for example, for Vss or ground connections (e.g., isolation) and pillars 1420 may be used for I/O (e.g., HSIO) and Vcc or power connections. In one embodiment, one of pillars 1420 is positioned between at least two of pillars 1410. As one non-limiting example, the pillars can be the diameter of the ball pads sizes in the package. For larger pillars such as pillars 1410, an exemplary diameter range is on the order of 200 microns (μπι) to 400 μπι and smaller pillars for ground such as pillars 1420 can be in the range of 80 μπι tol50 μπι. Figure 2 shows the interface of integrated circuit assembly 100. Figure 3 shows a top view of the interface of Figure 2. Interface 140, as illustrated, includes body 1405. In one embodiment, body 1405 of interface 140 is a composed of printed circuit material such as solder resist and FR-4 glass epoxy. Body 1405 has a thickness, t, representatively on the order of a z-dimension height of SLI ranging from about 100 microns (μιη) to 300 μιη. Disposed within body 1405 is electrically conductive layer 145 of, for example, a copper sheet that may be patterned. Body 1405 may be formed by laminating conductive layer 145 to a first layer of insulating material such as SR-4 glass epoxy and then laminating a second layer of insulating material to conductive layer 145 to embed the conductive layer.
In one embodiment, body 1405 of interface 140 has a number of openings therethrough. The openings are disposed in a direction generally perpendicular to a plane of conductive layer 145. Disposed within openings through body 1405 of interface 140 is an electrically conductive material such as solder that define pillars or posts extending from one side of the body to the other. Figure 2 and Figure 3 show that the openings, in one embodiment, may have different dimensions depending, for example, on the purpose of the pillar formed therein. Figures 1-3 show pillars 1410 and pillars 1420 through the openings with each pillar defining interface contact points on opposing sides of body 1405 of the interface. In one embodiment, pillars 1420 have a diameter, Di, that is greater than a diameter, D2, of pillars 1410. A diameter of the pillars is defined by the openings. In one embodiment, the openings into which electrically conductive material is introduced to form pillars 1410 and 1420 are lined with an electrically conductive material 148 such as copper. In one embodiment, electrically conductive material 148 that lines openings for pillars 1410 where pillars 1410 are designated as Vss or ground pillars are connected to conductive layer 145 disposed in body 1405 of interface 140 as, for example, a ground plane. In such an embodiment, pillars 1420 are isolated from conductive layer 145 as shown in Figure 1 and Figure 2. In another embodiment, the openings through body 1405 of interface 140 are not lined or are lined with an insulating material that would isolate pillars 1420 from conductive layer 145.
By utilizing an interface such as interface 140 with conductive pillars of controlled diameter (defined by openings in the body of the interface), improved ground isolation for I/O (e.g., HSIO) connections can be provided with reduced space and possibly number of isolation connections relative to prior art direct solder connections without an interface. In one embodiment, an interface such as described can occupy an area and volume generally equivalent to that occupied by a ball grid array in prior art connection systems. Finally, Figure 1 shows an assembly including one package connected to substrate 130. In another embodiment, more than one package may be connected to substrate 130. In such instance, a single interface may be disposed between multiple packages and substrate 130.
Referring again to Figure 1, in this embodiment, each of pillars 1410 are connected to contact points 125 of package substrate 120 and contact points 135 of substrate 130 through a direct connection (i.e., one end of each pillar is connected to one of contact points 125 of the package and the other end to one of contact points 135 of substrate 130). In a similar manner, pillars 1420 are connected to respective contact points 125 of package substrate 120 and contact points 135 of substrate 130. In another embodiment, where pillars 1410 are operable or designated for providing Vss or ground, isolation or connection, a direct connection by a pillar to contact points on each of a package substrate and another substrate such as a printed circuit board is not necessary. Figure 4 shows another embodiment of an integrated circuit assembly. Assembly 200 includes package 205 including die 210 that is, for example, a processor (e.g., CPU) attached to package substrate 220 through solder connections 215 between contact points of the structures. Package 205 is connected to substrate 230 that is, for example, a printed circuit board 230. Disposed between package 205 and substrate 230 is interface 240. Figure 5 shows a cross-sectional side view of the interface of Figure 4 isolated from the other structures of the assembly. In this embodiment, interface 240 includes body 2405 that includes conductive layer 245 encapsulated by an electrically insulated material such as SF-4 glass epoxy. Conductive layer 245 is an electrically conductive material such as copper. Disposed through body 2405 are openings through which electrically conductive material pillars are formed defining contact points on opposite sides of the body. Figure 4 and Figure 5 shows pillars of various sizes selected, in one embodiment, for the routing purpose such pillars provide. Figure 5 shows pillars 2410 that, in this embodiment, are designated for Vss or ground connection between package 205 and substrate 230; pillars 2420 designated for I/O connection between package 205 and substrate 230; pillar 2425 designed for a Vcc connection between package 205 and substrate 230; and pillar 2415 designated for a Vss or ground connection between package 205 and substrate 230. In one embodiment, pillars 2410 have a smaller diameter than a diameter of pillars 2420 or a diameter of pillar 2425. In this embodiment, each of pillars 2410 and pillar 2415 is connected to conductive layer 245 in interface 240 while pillars 2420 and pillar 2425 are not. In this manner, pillars 2410 are electrically ganged with pillar 2415. As shown in Figure 4, each of pillars 2410 are connected to respective ones of contact points or pads 225 of package 205 but these pillars are not connected to corresponding contact pads on substrate 230. Instead, pillar 2415 that, in one embodiment, has a larger diameter than a diameter of pillars 2410 serves as a single connection to substrate 230 for several connections (no solder resist opening of pillars 2410 to substrate 230).
Figure 6 shows a cross-sectional side view of another embodiment of an integrated circuit assembly. Assembly 300 includes package 305 including die 310 that is, for example, a processor connected to package substrate 320 through electrically conductive contacts 315 (e.g., solder connections). Package 305 is connected to interface 340 on a side opposite die 310 and interface 340 is connected to substrate 330 that is, for example, a printed circuit board (e.g., motherboard). Figure 7 shows a cross-sectional side view of interface 340 of assembly 300 isolated from the other structures of the assembly. As illustrated, in this embodiment, interface 340 includes electrically conductive material formed through openings through body 3405 of interface 340 to define interface contact points on opposite sides of the body. The electrically conductive material defines pillars 3420 that are connected to contact points 325 of package 320 and contact points 335 of substrate 330. As before the pillars may have a diameter selected for a purpose to be served by the pillar. In one embodiment, pillars 3420 are designated to bring I/O signals between package 305 and substrate 330. The electrically conductive material through openings in body 3405 of interface 340 also define pillars 3415 and 3425 configured as Vss or ground and Vcc or power connections, respectively, between package 305 and substrate 330.
In this embodiment, interface 340 includes multiple conductive layers within body
3405. In one embodiment, the multiple layers are two layers identified as electrically conductive layer 345 and layer 348, each of, for example, copper and each extending in a direction generally perpendicular to the pillars. As shown, each of the conductive layers may be patterned. Figures 6 and 7 show a portion of layer 345 connected or in contact with pillar 3415 to form a Vss or ground connection and a portion of layer 348 connected to pillar 3425 to form a Vcc or power connection. Referring to Figure 6, disposed on a surface of interface 340 adjacent to package 305 is one or more board edge capacitors 350 as one form of secondary devices that may be connected to an assembly. In this embodiment, one or more board edge capacitors 350 are connected to pillars 3430 and 3435 that provide Vcc and Vss connections to the one or more capacitors, respectively. In this manner, interface 340 provides power and ground for secondary devices such as one or more board edge capacitors 350, without requiring such power and ground lines, be disposed in substrate 330. Figure 6 also shows secondary device 360 that is, for example, a resistor, filter or oscillator. Secondary device 360 may be routed to other components in or through interface 340 rather than in or through substrate 330.
Figures 8-12 describe a process of forming an interface having pillars of electrically conductive material defining interface contact points on opposite sides of a body of the interface. Figure 13 presents a flow chart of a process of forming an interface. Referring to Figure 8 and Figure 13, the process begins by forming a body of the interface (block 510, Figure 13). In this embodiment, interface 440 includes body 4405 made up of one inner electrically conductive layers encapsulated on opposite sides by a dielectric material such as SR-4 glass epoxy material. Figure 8 shows electrically conductive layer 445 is, for example, a copper material that may be in the form of a sheet and optionally patterned as desired.
Figure 9 shows the structure of Figure 8 following the forming of openings through the interface (block 520, Figure 13). In one embodiment, the openings may be made according to techniques to form openings in printed circuit boards such as by punching or drilling opening or a PCB riveting process. As described above, the openings through body 4405 of interface 440 can have different diameters selected, in one embodiment, for the purpose of the electrical connection formed through the opening. Figure 9 shows body 4405 having opening 446A having a diameter, Di, that is greater than diameter, D2, of opening 446B.
Figure 10 shows the structure of Figure 9 following the optional lining of the openings through the interface body with a material (block 530, Figure 13). In one embodiment, suitable material for lining the openings is a copper material. Figure 10 shows lining layer 448 lining an inside of the openings. A lining of a copper material may be done by a plating process wherein, for example, the walls of each opening are seeded with a copper seed material then followed by an electroplating process to deposit a copper material on the side walls of the opening.
Figure 11 shows the structure of Figure 10 patterned to receive an electrically conductive material to form pillars in the the openings. In one embodiment, body 4405 of interface 440 is placed on base or support 460 and an opposite side of the body is masked with masking material 470 (e.g., a photoresist) leaving the openings exposed. With the mask in place and the interface supported, a controlled volume of an electrically conductive material may be introduced into the openings to fill the openings. In one embodiment, the electrically conductive material is a pre-solder.
Figure 12 shows the structure of Figure 11 following the filling of the openings in interface 440 to form pillars (block 540, Figure 13). In an embodiment where the electrically conductive material is a pre-solder, such pre-solder may be introduced to fill the openings. Mask 470 may then be removed and then a reflow process at an elevated temperature is performed followed by cooling process to solidify the electrically conductive material in the openings and form the final structure.
Figure 14 illustrates computing device 600 in accordance with one implementation.
Computing device 600 houses board 602. Board 602 may include a number of components, including but not limited to processor 604 and at least one communication chip 606.
Processor 604 of computing device 600 includes an integrated circuit die packaged within processor 604. In some implementations, the integrated circuit die of the processor includes one or more devices. Communication chip 606 also includes an integrated circuit die packaged within communication chip 606. Processor 604 is physically and electrically coupled to board 602. In some implementations at least one communication chip 606 is also physically and electrically coupled to board 602 utilizing an interface as described. In further implementations, communication chip 606 is part of processor 604.
Depending on its applications, computing device 600 may include other components that may or may not be physically and electrically coupled to board 602. These other components include, but are not limited to, volatile memory (e.g., DRAM), non-volatile memory (e.g., ROM), flash memory, a graphics processor, a digital signal processor, a crypto processor, a chipset, an antenna, a display, a touchscreen display, a touchscreen controller, a battery, an audio codec, a video codec, a power amplifier, a global positioning system (GPS) device, a compass, an accelerometer, a gyroscope, a speaker, a camera, and a mass storage device (such as hard disk drive, compact disk (CD), digital versatile disk (DVD), and so forth).
Communication chip 606 enables wireless communications for the transfer of data to and from computing device 600. The term "wireless" and its derivatives may be used to describe circuits, devices, systems, methods, techniques, communications channels, etc., that may communicate data through the use of modulated electromagnetic radiation through a non-solid medium. The term does not imply that the associated devices do not contain any wires, although in some embodiments they might not. Communication chip 606 may implement any of a number of wireless standards or protocols, including but not limited to Wi-Fi (IEEE 802.11 family), WiMAX (IEEE 802.16 family), IEEE 802.20, long term evolution (LTE), Ev-DO, HSPA+, HSDPA+, HSUPA+, EDGE, GSM, GPRS, CDMA, TDMA, DECT, Bluetooth, derivatives thereof, as well as any other wireless protocols that are designated as 3G, 4G, 5G, and beyond. Computing device 600 may include a plurality of communication chips 606. For instance, first communication chip 606 may be dedicated to shorter range wireless communications such as Wi-Fi and Bluetooth and second
communication chip 606 may be dedicated to longer range wireless communications such as GPS, EDGE, GPRS, CDMA, WiMAX, LTE, Ev-DO, and others.
The term "processor" may refer to any device or portion of a device that processes electronic data from registers and/or memory to transform that electronic data into other electronic data that may be stored in registers and/or memory.
In various implementations, computing device 600 may be a laptop, a netbook, a notebook, an ultrabook, a smartphone, a tablet, a personal digital assistant (PDA), an ultra mobile PC, a mobile phone, a desktop computer, a server, a printer, a scanner, a monitor, a set-top box, an entertainment control unit, a digital camera, a portable music player, or a digital video recorder. In further implementations, computing device 600 may be any other electronic device that processes data. EXAMPLES
Example 1 is an integrated circuit assembly including a package including an integrated circuit chip; a printed circuit board; and an interface between the package and the printed circuit board, wherein the interface includes a body including a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface, the contact points connected to contact points on the package and contact points on the printed circuit board.
In Example 2, the electrically conductive material of the integrated circuit assembly of Example 1 includes solder.
In Example 3, the plurality of openings of the integrated circuit assembly of Example
1 includes openings of different sizes.
In Example 4, a first set of the interface contact points are designated ground contact points and a second set of the interface contact points are designated input/output contact points of the integrated circuit assembly of any of Examples 1-3, wherein a diameter of the first set of the interface contact points and is less than a diameter of the second set of the interface contact points.
In Example 5, ones of the second set of interface contact points of the integrated circuit assembly of Example 4 are positioned between ones of the first set of interface contact points. In Example 6, the body of the interface of the integrated circuit assembly of any of Examples 1-6 includes at least one routing layer therein.
In Example 7, the interface of the integrated circuit assembly of Example 6 further includes at least one routing layer contact on a surface of the body of the interface and connected to the at least one routing layer.
In Example 8, the body of the interface of the integrated circuit assembly of Example 7 includes an area dimension greater than an area of the package and the at least one routing layer contact is positioned on the surface of the body of the interface in an area outside an area occupied by the package.
In Example 9, the at least one routing layer of the integrated circuit assembly of
Example 7 includes a power routing layer and a ground routing layer and the at least one routing layer contact includes a power routing layer contact connected to the power routing layer and a ground routing layer contact connected to the ground routing layer.
Example 10 is an integrated circuit interface including a body including a plurality of openings from a first side of the body to an opposite second side; electrically conductive material in respective ones of the openings defining interface contact points on a first side of the body of the interface operable for connection to contact points of an integrated circuit package and interface contact points on a second side of the body of the interface operable for connection to contact points on a substrate.
In Example 11, the electrically conductive material of the integrated circuit interface of Example 10 includes solder.
In Example 12, the electrically conductive material of the integrated circuit interface of Example 11 includes a first electrically conductive material and the plurality of openings are lined with a second electrically conductive material that is different than the first electrically conductive material.
In Example 13, the plurality of openings of the integrated circuit interface of Example 10 or 11 includes openings of different sizes.
In Example 14, a first set of the interface contact points are designated ground contact points and a second set of the interface contact points are designated input/output contact points of the integrated circuit interface of Example 10, wherein a diameter of the first set of the interface contact points and is less than a diameter of the second set of the interface contact points. In Example 15, ones of the second set of interface contact points of the integrated circuit interface of Example 14 are positioned between ones of the first set of interface contact points.
In Example 16, the body of the integrated circuit interface of Example 10 includes at least one routing layer therein.
In Example 17, the interface of the integrated circuit interface of Example 16 further includes at least one routing layer contact on a surface of the body and connected to the at least one routing layer.
In Example 18, the body of the integrated circuit interface of Example 17 includes an area dimension greater than an area of an integrated circuit package to which the contact points on the first side of the body are operable for connection and the at least one routing layer contact is positioned on the surface of the body in an area outside an area to be occupied by the integrated circuit package.
In Example 19, the at least one routing layer of the integrated circuit interface of Example 17 includes a power routing layer and a ground routing layer and the at least one routing layer contact includes a power routing layer contact connected to the power routing layer and a ground routing layer contact connected to the ground routing layer.
Example 20 is a method of forming an integrated circuit assembly including positioning an interface between an integrated circuit package and a substrate, wherein the interface includes a body including a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface; connecting the interface contact points to respective ones of contacts points on the integrated circuit package and on the substrate.
In Example 21, connecting in the method of Example 20 includes thermal compression bonding.
In Example 22, the body of the interface in the method of Example 20 or 21 includes at least one routing layer therein and at least one routing layer contact on a surface of the body and connected to the at least one routing layer, the method further including connecting a device to the at least one routing layer contact.
In Example 23, the body of the interface in the method of Example 22 includes an area dimension greater than an area of the integrated circuit package and the at least one routing layer contact is positioned on the surface of the body in an area outside an area occupied by the integrated circuit package. In Example 24, the at least one routing layer in the method of Example 23 includes a power routing layer and a ground routing layer and the at least one routing layer contact includes a power routing layer contact connected to the power routing layer and a ground routing layer contact connected to the ground routing layer.
The above description of illustrated implementations, including what is described in the Abstract, is not intended to be exhaustive or to limit the invention to the precise forms disclosed. While specific implementations of, and examples for, the invention are described herein for illustrative purposes, various equivalent modifications are possible within the scope, as those skilled in the relevant art will recognize.
These modifications may be made to the invention in light of the above detailed description. The terms used in the following claims should not be construed to limit the invention to the specific implementations disclosed in the specification and the claims. Rather, the scope is to be determined entirely by the following claims, which are to be construed in accordance with established doctrines of claim interpretation.

Claims

1. An integrated circuit assembly comprising:
a package including an integrated circuit chip;
a printed circuit board; and
an interface between the package and the printed circuit board, wherein the interface comprises a body comprising a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface, the contact points coupled to contact points on the package and contact points on the printed circuit board.
2. The integrated circuit assembly of claim 1, wherein the electrically conductive material comprises solder.
3. The integrated circuit assembly of claim 1, wherein the plurality of openings comprises openings of different sizes.
4. The integrated circuit assembly of claim 1, wherein a first set of the interface contact points are designated ground contact points and a second set of the interface contact points are designated input/output contact points, wherein a diameter of the first set of the interface contact points and is less than a diameter of the second set of the interface contact points.
5. The integrated circuit assembly of claim 4, wherein ones of the second set of interface contact points are positioned between ones of the first set of interface contact points.
6. The integrated circuit assembly of claim 1, wherein the body of the interface comprises at least one routing layer therein.
7. The integrated circuit assembly of claim 6, wherein the interface further comprises at least one routing layer contact on a surface of the body of the interface and coupled to the at least one routing layer.
8. The integrated circuit assembly of claim 7, wherein the body of the interface comprises an area dimension greater than an area of the package and the at least one routing layer contact is positioned on the surface of the body of the interface in an area outside an area occupied by the package.
9. The integrated circuit assembly of claim 7, wherein the at least one routing layer comprises a power routing layer and a ground routing layer and the at least one routing layer contact comprises a power routing layer contact coupled to the power routing layer and a ground routing layer contact coupled to the ground routing layer.
10. An integrated circuit interface comprising:
a body comprising a plurality of openings from a first side of the body to an opposite second side;
electrically conductive material in respective ones of the openings defining interface contact points on a first side of the body of the interface operable for connection to contact points of an integrated circuit package and interface contact points on a second side of the body of the interface operable for connection to contact points on a substrate.
11. The integrated circuit interface of claim 10, wherein the electrically conductive material comprises solder.
12. The integrated circuit interface of claim 11, wherein the electrically conductive material comprises a first electrically conductive material and the plurality of openings are lined with a second electrically conductive material that is different than the first electrically conductive material.
13. The integrated circuit interface of claim 10, wherein the plurality of openings comprises openings of different sizes.
14. The integrated circuit interface of claim 10, wherein a first set of the interface contact points are designated ground contact points and a second set of the interface contact points are designated input/output contact points, wherein a diameter of the first set of the interface contact points and is less than a diameter of the second set of the interface contact points.
15. The integrated circuit interface of claim 14, wherein ones of the second set of interface contact points are positioned between ones of the first set of interface contact points.
16. The integrated circuit interface of claim 10, wherein the body comprises at least one routing layer therein.
17. The integrated circuit interface of claim 16, wherein the interface further comprises at least one routing layer contact on a surface of the body and coupled to the at least one routing layer.
18. The integrated circuit interface of claim 17, wherein the body comprises an area dimension greater than an area of an integrated circuit package to which the contact points on the first side of the body are operable for connection and the at least one routing layer contact is positioned on the surface of the body in an area outside an area to be occupied by the integrated circuit package.
19. The integrated circuit interface of claim 17, wherein the at least one routing layer comprises a power routing layer and a ground routing layer and the at least one routing layer contact comprises a power routing layer contact coupled to the power routing layer and a ground routing layer contact coupled to the ground routing layer.
20. A method of forming an integrated circuit assembly comprising:
positioning an interface between an integrated circuit package and a substrate, wherein the interface comprises a body comprising a plurality of openings therethrough and with electrically conductive material in ones of the plurality of openings defining interface contact points on opposite sides of the body of the interface;
coupling the interface contact points to respective ones of contacts points on the integrated circuit package and on the substrate.
21. The method of claim 20, wherein coupling comprises thermal compression bonding.
22. The method of claim 20, wherein the body of the interface comprises at least one routing layer therein and at least one routing layer contact on a surface of the body and coupled to the at least one routing layer, the method further comprising coupling a device to the at least one routing layer contact.
23. The method of claim 22, wherein the body of the interface comprises an area dimension greater than an area of the integrated circuit package and the at least one routing layer contact is positioned on the surface of the body in an area outside an area occupied by the integrated circuit package.
24. The method of claim 23, wherein the at least one routing layer comprises a power routing layer and a ground routing layer and the at least one routing layer contact comprises a power routing layer contact coupled to the power routing layer and a ground routing layer contact coupled to the ground routing layer.
PCT/US2017/054315 2017-09-29 2017-09-29 Pillar array plate WO2019066902A1 (en)

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Citations (5)

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US20030189083A1 (en) * 2001-12-29 2003-10-09 Olsen Edward H. Solderless test interface for a semiconductor device package
KR20120060960A (en) * 2010-09-20 2012-06-12 삼성전자주식회사 Semiconductor packages, electronic devices and electronic systems employing the same
US20120267779A1 (en) * 2011-04-25 2012-10-25 Mediatek Inc. Semiconductor package
US20170064837A1 (en) * 2015-09-01 2017-03-02 Qualcomm Incorporated Integrated circuit (ic) module comprising an integrated circuit (ic) package and an interposer with embedded passive components

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5574630A (en) * 1995-05-11 1996-11-12 International Business Machines Corporation Laminated electronic package including a power/ground assembly
US20030189083A1 (en) * 2001-12-29 2003-10-09 Olsen Edward H. Solderless test interface for a semiconductor device package
KR20120060960A (en) * 2010-09-20 2012-06-12 삼성전자주식회사 Semiconductor packages, electronic devices and electronic systems employing the same
US20120267779A1 (en) * 2011-04-25 2012-10-25 Mediatek Inc. Semiconductor package
US20170064837A1 (en) * 2015-09-01 2017-03-02 Qualcomm Incorporated Integrated circuit (ic) module comprising an integrated circuit (ic) package and an interposer with embedded passive components

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