阅读说明：本技术 芯片尺度薄3d管芯堆叠封装 (Chip scale thin 3D die stack package ) 是由 R·桑克曼 S·贾内桑 B·韦德哈斯 T·瓦纳 L·克泽尔 于 2019-05-07 设计创作，主要内容包括：本文所公开的实施例包含一种包括堆叠管芯的电子封装。在一个实施例中,电子封装包括第一管芯,该第一管芯包括从第一管芯的第一表面延伸出的多个第一导电?互连。在一个实施例中,第一管芯还包括禁用区带。在一个实施例中,电子封装还可以包括第二管芯。在一个实施例中,第二管芯完全位于第一管芯的禁用区带的?周界内。在一个实施例中,第二管芯的第一表面?面向第一管芯的第一表面。(Embodiments disclosed herein include an electronic package including stacked dies. In one embodiment, an electronic package includes a first die including a plurality of first conductive ‎ interconnects extending from a first surface of the first die. In one embodiment, the first die further includes a disable zone. In one embodiment, the electronic package may further include a second die. In one embodiment, the second die is located entirely within the ‎ perimeter of the disabled zone of the first die. In one embodiment, the first surface ‎ of the second die faces the first surface of the first die.)

1. An electronic package, comprising:

a first die, wherein the first die comprises a plurality of first conductive interconnects extending from a first surface of the first die, and wherein the first die comprises a disabling zone; and

A second die, wherein the second die is located entirely within a perimeter of the keep-out zone of the first die, and wherein a first surface of the second die faces the first surface of the first die.

2. The electronic package of claim 1, wherein the conductive interconnect has a height greater than a thickness of the second die.

3. The electronic package of claim 1 or 2, wherein the conductive interconnects have an aspect ratio of 3:1 or greater.

4. The electronic package of claim 1 or 2, wherein the second die is electrically coupled to the first die by a solder bump.

5. The electronic package of claim 1 or 2, wherein the first surface of the first die comprises active devices, and wherein the first surface of the second die comprises active devices.

6. The electronic package of claim 1 or 2, further comprising:

a third die, wherein the third die is entirely within a perimeter of the keep-out zone of the first die, and wherein the third die includes a plurality of posts extending from a first surface of the third die, wherein the plurality of posts extending from the first surface of the third die electrically couple the third die to the first die.

7. The electronic package of claim 6, wherein the second die is located between the first surface of the first die and the first surface of the third die.

8. The electronic package of claim 7, wherein the third die includes a disable zone, and wherein the second die is located above the disable zone of the third die.

9. The electronic package of claim 8, wherein the second die is located entirely within a perimeter of the keep-out zone of the third die.

10. The electronic package of claim 8, wherein a portion of the second die is located above the keep-out zone of the third die.

11. The electronic package of claim 1 or 2, further comprising:

a package substrate electrically coupled to the first die through the plurality of conductive interconnects.

12. The electronic package of claim 11, wherein the package substrate includes a recess within the perimeter of the keep out zone of the first die.

13. The electronic package of claim 11, wherein the package substrate includes an opening completely through the package substrate within the perimeter of the keep out zone of the first die.

14. The electronic package of claim 1 or 2, further comprising a third die and a fourth die, wherein the third die and the fourth die are entirely within a perimeter of the keep out zone of the first die.

15. The electronic package of claim 14, wherein at least one of the second die, the third die, and the fourth die comprises a through substrate via.

16. An electronic package, comprising:

a first die, wherein the first die includes a disable zone;

a second die, wherein the first surface of the first die faces the first surface of the second die, and wherein the second die is located within the perimeter of the keep-out zone of the first die; and

a third die, wherein the third die includes a plurality of conductive pillars extending from a first surface of the third die, and wherein the conductive pillars electrically couple the third die to the first die.

17. The electronic package of claim 16, wherein the electronic package is a Wafer Level Chip Scale (WLCS) package.

18. The electronic package of claim 16 or 17, wherein the electronic package is a fan-out package.

19. The electronic package of claim 16 or 17, wherein the third die includes a disable zone, and wherein the second die is located at least partially within the disable zone of the third die.

20. The electronic package of claim 16 or 17, further comprising a molding layer over the first die, wherein the second die and the third die are embedded within the molding layer.

21. The electronic package of claim 20, wherein the third die is completely embedded within the molding layer.

22. The electronic package of claim 20, wherein the third die at least partially extends out of the molding layer, and wherein a bottom surface of the third die has a standoff distance of about 50 μ ι η or greater from an underlying Printed Circuit Board (PCB).

23. A computer system, comprising:

a first die;

a second die communicatively coupled to the first die, wherein the first surface of the first die faces the first surface of the second die;

a third die, wherein a first surface of the third die faces the first surface of the first die, and wherein the third die is electrically coupled to the first die by a plurality of conductive pillars; and

A plurality of second level interconnects electrically coupled to the first surface of the first die, wherein the second die and the third die are located between the first surface of the first die and the second level interconnects.

24. The computer system of claim 23, wherein the plurality of second level interconnects are coupled to the first die through copper pillars extending from the first surface of the first die.

25. The computer system of claim 23 or 24, wherein the plurality of second level interconnects are coupled to the first die through vias and traces in a redistribution layer.

Technical Field

Embodiments of the present disclosure relate to electronic packages, and more particularly, to package configurations including 3D stacks with face-to-face die stacks.

Background

To provide increased computing power and/or functionality, electronic packages typically include multiple dies communicatively coupled to one another. For example, a memory die may be communicatively coupled to a processor die. To provide an improved form factor, multiple dies are typically stacked.

One example of a stacked die includes a main die flip-chip mounted to a package substrate and a stacked die formed over a backside surface of the main die. The stacked die may be wire bonded to a package substrate. In such a configuration, the main die and the stacked die are oriented in a back-to-back configuration (i.e., the surfaces of each die having active devices face away from each other). Wire bonding increases the Z-height of the package and increases the X-Y form factor.

Additional examples of stacked dies include package on package (PoP) configurations. In such a configuration, the primary die may be a flip chip mounted to the first package substrate, and the stacked die may be wire bonded to the second package substrate. The second package substrate may be electrically coupled to the first package substrate by conductive pillars formed around a perimeter of the main die. In such a configuration, the main die and the stacked die are oriented in a back-to-back configuration. Wire bonding and additional package substrate increase the Z-height of the package and the need for posts around the first package increases the X-Y form factor.

Additional examples of stacked dies include a main die flip-chip mounted to a package substrate, wherein the stacked die is coupled to a backside surface of the main die. In such a configuration, the master die may have through-silicon vias (TSVs) to provide electrical connections from the active surface of the master die to the active surface of the stacked chips. In such a configuration, the main die and the stacked die are oriented in a back-to-front configuration (i.e., the backside surface of the main die faces the active surface of the stacked die). Such a configuration provides improved Z-height and X-Y form factor compared to wire bonded stacked die and PoP configurations. However, the inclusion of TSVs adds significant cost and complexity to the main die.

Yet another configuration of stacked dies includes a main die flip-chip mounted to a first surface of a package substrate, and a stacked die flip-chip mounted to a second surface of the package substrate. Such embodiments improve the Z-height and X-Y form factor compared to wire bonded stacked die and PoP configurations. However, mounting the stacked die to the second surface of the package substrate requires a reduction in the number of second level interconnects at the location of the second die.

Drawings

Fig. 1A is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies in a face-to-face orientation with the first die, in accordance with one embodiment.

FIG. 1B is a plan view illustration of the electronic package in FIG. 1A along line B-B' according to one embodiment.

Fig. 2 is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein the package substrate includes a cavity, according to one embodiment.

Fig. 3 is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein a package substrate includes vias, according to one embodiment.

Fig. 4A is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein the electronic package is a Wafer Level Chip Scale Package (WLCSP), according to one embodiment.

Fig. 4B is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies in a WLCSP, with one of the stacked dies extending out of the molding layer, according to one embodiment.

Fig. 5A is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies in a fan-out package, according to one embodiment.

Fig. 5B is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies in a fan-out package, with one of the stacked dies extending out of a molding layer, according to one embodiment.

Fig. 5C is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein the stacked dies include a redistribution layer, according to one embodiment.

Fig. 6A is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein one of the stacked dies includes a TSV, according to one embodiment.

Fig. 6B is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein one of the stacked dies includes a TSV, in accordance with an additional embodiment.

Fig. 6C is a cross-sectional illustration of an electronic package having a first die and a plurality of stacked dies, wherein more than one of the stacked dies includes a TSV, in accordance with additional embodiments.

Fig. 7A is a plan view illustration of a wafer and an enlarged perspective view of a first die on the wafer according to one embodiment.

Fig. 7B is a perspective view of a process for mounting a second die to a first die according to one embodiment.

Fig. 7C is a perspective view of a process for mounting a third die to the first die according to one embodiment.

Fig. 7D is a cross-sectional view of the electronic package in fig. 7C, in accordance with one embodiment.

FIG. 8 is a schematic diagram of a computing device constructed according to one embodiment.

Detailed Description

Electronic packages having stacked dies and methods of forming stacked die packages are described herein. In the following description, various aspects of the illustrative implementations will be described using terms commonly employed by those skilled in the art to convey the substance of their work to others skilled in the art. It will be apparent, however, to one skilled in the art that the present invention may be practiced with only some of the described aspects. For purposes of explanation, specific numbers, materials, and configurations are set forth in order to provide a thorough understanding of the illustrative implementations. It will be apparent, however, to one skilled in the art that the present invention may be practiced without these specific details. In other instances, well-known features are omitted or simplified in order not to obscure the illustrative implementations.

Various operations will be described as multiple discrete operations, in turn, in a manner that is most helpful in understanding the present invention, however, the order of description should not be construed as to imply that these operations are necessarily order dependent. In particular, these operations need not be performed in the order of presentation.

As noted above, the drive toward increased functionality has required communicatively coupling multiple dies together. However, this has led to an increase in the form factor of such electronic packages. Accordingly, embodiments described herein include multiple dies packaged in a face-to-face configuration. As used herein, face-to-face may refer to the active surface of a first die being oriented such that it faces the active surface of a second die.

In one embodiment, the face-to-face configuration may be achieved by placing the die pads as bumps on the edge of the first die. The inner surface area of the first die may be a keep out zone. Additional dies can be stacked within the perimeter of the forbidden zone. The attachment from the first die to the second level interconnect may be made with posts or conductive features in the redistribution layer. Thus, embodiments allow for flip chip configurations, Wafer Level Chip Scale Package (WLCSP) configurations, fan-out configurations, and the like.

Referring now to fig. 1A, a cross-sectional illustration of an electronic package 100 is shown, according to one embodiment. In one embodiment, the electronic package 100 may include a plurality of stacked dies. In one embodiment, the first die 110 may be flip-chip mounted to the package substrate 170. The first surface 111 of the first die 110 may be oriented such that the first surface 111 faces the package substrate 170. In one embodiment, the first surface 111 may be referred to as an active surface of the first die 110. For example, active features (e.g., transistors, etc.) may be formed proximate to the first surface 111 of the first die 110.

In one embodiment, the package substrate 170 may include a Second Level Interconnect (SLI) 172 electrically coupled to the first die 110. In one embodiment, the first die 110 may be electrically coupled to the package substrate 170 through the conductive pillars 112 and the solder bumps 113. In one embodiment, conductive pillars 112 may extend from the first surface 111 of the first die 110. In one embodiment, the conductive pillars 112 may have a height H sufficient to allow one or more dies to be stacked between the first surface 111 of the first die 110 and the package substrate 170. For example, in fig. 1A, the second die 120, the third die 130, and the fourth die 140 are stacked between the first die 110 and the package substrate 170. In one embodiment, conductive pillars 112 may have a height H of 20 μm or greater, 50 μm or greater, or 100 μm or greater. In one embodiment, the conductive posts 112 may be high aspect ratio conductive posts. For example, the conductive pillars 112 may have a height of 2:1 or greater, 3:1 or greater, or 5:1 or greater: width aspect ratio. In one embodiment, the conductive posts 112 may be any suitable conductive material. For example, the conductive posts 112 may be copper or the like.

In one embodiment, one or more dies stacked between the first die 110 and the package substrate 170 may be oriented in a face-to-face configuration with the first die 110. For example, in the embodiment shown in fig. 1A, the second die 120, the third die 130, and the fourth die 140 are oriented in a face-to-face configuration with the first die 110. In particular, the first surface 121 of the second die 120, the first surface 131 of the third die 131, and the first surface 141 of the fourth die are all oriented such that they face the first surface 111 of the first die. In one embodiment, first surfaces 121, 131 and 141 may be active surfaces of chips 120, 130 and 140, respectively.

In one embodiment, the stacked die may be electrically coupled to the first die 110 by solder bumps and/or conductive pillars. In one embodiment, the second die 120 is electrically coupled to the first die 110 through solder bumps 123 and/or copper pillars (not shown). In one embodiment, the third die 130 is electrically coupled to the first die 110 through the conductive pillars 132 and the solder bumps 133 over the conductive pillars 132. In one embodiment, fourth die 140 is electrically coupled to first die 110 by conductive pillars 142 and solder bumps 143 over conductive pillars 142. While conductive pillars are referred to herein as forming interconnects between dies, it should be understood that any suitable structure may be used to overcome the distance between dies. For example, the conductive posts may be replaced with copper core bumps or the like.

In one embodiment, electronic package 100 may further include a molding layer 160 formed around the plurality of dies 110, 120, 130, 140 and over package substrate 170. For example, multiple dies 110 may be completely embedded within molding layer 160. However, additional embodiments may include a molding layer 160 that exposes portions of the first die 110 (e.g., the backside surface of the first die 110). In one embodiment, the first die 110 may be electrically coupled to a Second Level Interconnect (SLI) 172 through the package substrate 170. In one embodiment, SLI 172 may be a solder bump or any other SLI architecture.

In one embodiment, multiple dies may have any functionality. In one particular embodiment, the first die 110 may be a processor, and one or more of the second die 120, the third die 130, and the fourth die 140 may be a memory die. However, the face-to-face stacked dies used in accordance with embodiments may have other functions (e.g., RF transceivers, power management, graphics processing, etc.).

Referring now to FIG. 1B, a plan view illustration of FIG. 1A along line B-B' is shown, according to one embodiment. Fig. 1B shows a layout of multiple dies implementing a stacked face-to-face configuration of multiple dies 110, 120, 130, and 140.

In the illustrated embodiment, the perimeter of the first die 110 is represented as a dashed line. In one embodiment, first die 110 may include a disabling zone 115. In one embodiment, a plurality of conductive pillars 112 are formed outside the perimeter of the keep-out zone 115. For example, first die 110 may include die pads outside disabling zone 115, or a redistribution layer (RDL) may be used to reroute die pads outside disabling zone 115.

In one embodiment, the one or more stacked dies (i.e., dies 120, 130, and 140) may be positioned within the keep-out zone 115 of the first die 110. As used herein, when a die is said to be positioned within the keep-out zone of another die, it should be understood that the relative positioning of the dies refers to their positioning in the X-Y plane.

In one embodiment, one or more of stacked dies 120, 130, and 140 may have its own disable zone. Providing a disable zone in one or more stacked dies allows each die to have a direct connection to first die 110. Therefore, Through Silicon Vias (TSVs) are not required and costs can be reduced. However, as will be described in more detail below, embodiments are not limited to configurations without TSVs.

In one embodiment, the stacked die closest to first die 110 (i.e., second die 120) may not have a disabled zone. In one embodiment, the third die 130 may have a disable zone 135. In one embodiment, the second die 120 may be positioned within the perimeter of the keep out zone 135 of the third die 130. In the embodiment shown, the second die 120 is not completely within the disable zone 135 of the third die. For example, the second die 120 may not be stacked directly over the third die 130. However, embodiments may also include a second die 120 stacked directly over a third die 130. In such an embodiment, the second die 120 may be entirely within the disabling zone 135 of the third die.

In one embodiment, the fourth die 140 may have a disabling zone 145. In one embodiment, the second die 120 and the third die 130 may be positioned within the perimeter of the keep-out zone 145. In the embodiment shown, the second die 120 and the third die 130 are entirely within the disable zone 145 of the fourth die 140. However, it should be understood that one or both of the second die 120 and the third die 130 may be offset from the fourth die 140 (i.e., not completely over the fourth die 140) and thus may be partially outside the disabling zone 145.

Referring now to fig. 2, a cross-sectional illustration of an electronic package 200 according to an additional embodiment is shown. In one embodiment, electronic package 200 may be substantially similar to electronic package 100 described above, except that package substrate 270 may include cavity 273. In one embodiment, the cavity 273 may be formed in the shadow of the forbidden zone of the first die 210. As such, one or more stacked die may extend into the cavity 273. For example, the fourth die 240 is partially disposed in the cavity 273. The formation of the cavity 273 allows for a reduction in Z-height, the ability to stack thicker die, and/or the ability to stack more die.

Referring now to fig. 3, a cross-sectional illustration of an electronic package 300 is shown, in accordance with an additional embodiment. In one embodiment, the electronic package 300 may be substantially similar to the electronic package 200 described above, except that the cavity is replaced with a through-hole 374 that extends completely through the package substrate 370. The use of vias 374 allows for a reduction in Z height, the ability to stack thicker die, and/or the ability to stack more die. However, it should be understood that the use of vias 374 may result in a reduction in the number of SLIs 372 from the area of the package substrate where vias 374 are formed.

In fig. 1A-3, the electronic packages each include conductive pillars to provide electrical connection between the package substrate and the first die. However, it should be understood that other packaging architectures may be used to form face-to-face stacked dies in accordance with the embodiments described herein. In particular, it should be understood that any suitable structure may be used to overcome the distance between the first die and the package substrate. For example, the conductive posts may be replaced with copper core bumps or the like.

Referring now to fig. 4A, a cross-sectional illustration of an electronic package 400 is shown, according to one embodiment. In one embodiment, electronic package 400 may have multiple dies configured in a face-to-face orientation substantially similar to the configuration described above with respect to fig. 1A, except that first die 410 is electrically coupled to SLI 472 through RDL 480. In such an embodiment, the package substrate may be omitted. For example, a plurality of conductive traces 482 and vias 481 formed in RDL 480 may provide electrical connections from first die 410 to SLI 472. An electronic package 400 such as that shown in fig. 4A may be referred to as a WLCSP.

Referring now to fig. 4B, a cross-sectional illustration of an electronic package 400 is shown, in accordance with an additional embodiment. The electronic package 400 shown in fig. 4B may be substantially the same as the electronic package 400 shown in fig. 4A, except that one or more of the stacked dies extend beyond the RDL 480. For example, the fourth die 440 extends outward beyond the RDL 480. In particular, the sidewalls 448 and the second surface 447 of the fourth die 440 may be exposed. In such an embodiment, the number of SLIs 472 may be reduced from the area of the RDL in which the fourth die 440 is exposed. In one embodiment, the second surface 447 of the fourth die 440 may have a standoff distance D sufficient to allow mounting to a Printed Circuit Board (PCB) (not shown). In one embodiment, standoff distance D may be a function of the pitch and ball diameter of SLI 472. In one embodiment, the standoff distance D may be about 50 μm or greater.

Referring now to fig. 5A, a cross-sectional illustration of an electronic package 500 is shown, in accordance with an additional embodiment. In one embodiment, electronic package 500 may be referred to as a fan-out package. For example, electronic package 500 may include SLI572 outside of the footprint (footprint) of first die 510. In one embodiment, SLI572 may be electrically coupled to first die 510 with traces 582 and vias 581 formed in RDL 580 in a manner substantially similar to electronic package 400 described above with reference to fig. 4A. In one embodiment, molding layer 570 may be formed over first die 510 and in contact with RDL 580.

Referring now to fig. 5B, a cross-sectional illustration of an electronic package 500 is shown, in accordance with an additional embodiment. The electronic package 500 shown in fig. 5B may be substantially the same as the electronic package 500 shown in fig. 5A, except that one or more of the stacked dies extend beyond the RDL 580. For example, the fourth die 540 extends outward beyond the RDL 580. In particular, the sidewalls 548 and the second surface 547 of the fourth die 540 may be exposed. In such embodiments, the number of SLIs 572 may be reduced from the area of the RDL that exposes fourth die 540. In one embodiment, the second surface 547 of the fourth die 540 may have a standoff distance D sufficient to allow mounting to a Printed Circuit Board (PCB) (not shown). In one embodiment, standoff distance D may be a function of the pitch and ball diameter of SLI 572. In one embodiment, the standoff distance D may be about 50 μm or greater.

Although the electronic package described above with respect to fig. 1A-5B does not include a die having TSVs, it should be understood that embodiments are not limited to such a configuration. For example, an embodiment may include one or more stacked dies including TSVs. Examples of such embodiments are described with reference to fig. 6A-6C.

Referring now to fig. 6A, a cross-sectional illustration of an electronic package 600 is shown, according to one embodiment. The electronic package 600 may be substantially similar to the electronic package described with respect to fig. 1A, except that one of the stacked dies includes the TSV 635. For example, the third die 630 may include a plurality of TSVs 635. In this way, the fourth die 640 under the third die 630 need not have a disable zone since electrical connections to the first die may be made through the third die 630.

Referring now to fig. 5C, a cross-sectional illustration of an electronic device package 500 is shown, in accordance with an additional embodiment. Electronic package 500 in fig. 5C may be substantially similar to electronic package 500 in fig. 5B, except that second die 520, third die 530, and fourth die 540 may include redistribution layer 524/534/544. In one embodiment, redistribution layer 524/534/544 may include traces, vias, and/or pads. For example, the use of RDL 524/534/544 allows die pads to be formed at any location on die 520/530/540, rather than just along the perimeter of the die below conductive interconnects 523/532/542. Although redistribution layer 524/534/544 is shown in fig. 5C, it should be understood that any of the other embodiments described herein may also include a redistribution layer over one or more of the dies in order to provide improved flexibility in die pad placement.

Referring now to fig. 6B, a cross-sectional illustration of an electronic package 600 is shown, in accordance with an additional embodiment. In one embodiment, the electronic package 600 may be substantially similar to the electronic package 600 described with respect to fig. 6A, except that the fourth die 640 may also include electrical connections directly to the first die 610. For example, conductive pillars 642 and solder bumps 643 may electrically couple fourth die 640 to first die 610 without passing through TSV 635. However, it should be understood that additional electrical connections to the fourth die 640 may be made by utilizing TSVs 635 that pass through the third die 630.

Referring now to fig. 6C, a cross-sectional illustration of an electronic package 600 is shown, in accordance with an additional embodiment. In one embodiment, the electronic package 600 may be substantially similar to the electronic package 600 described with respect to fig. 6A, except that the plurality of dies include TSVs. For example, TSV 625 may be formed through the second die 620 and TSV 635 may be formed through the third die 630. In such embodiments, the electrical connection between the fourth die 640 and the first die 610 may be made by conductive pillars 642_AAnd solder bump 643_AWithout passing through TSV 625 and through conductive pillars 642 connected to TSV 625_BAnd solder bump 643 _B. Additional connections to the fourth die 640 may be made by solder bumps 643 connected to TSVs 635 via the third die 630_CTo form the composite material.

Referring now to fig. 7A-7C, a series of diagrams depict a process that may be used to form an electronic package such as those described above, according to one embodiment.

Referring now to fig. 7A, a plan view illustration of a wafer 790 having a plurality of dies 710 is shown, in accordance with one embodiment. Fig. 7A also shows an enlarged perspective view of a first die 710 formed on a wafer 790, according to one embodiment.

In one embodiment, wafer 790 may be any suitable semiconductor wafer (e.g., a silicon wafer, a silicon-on-insulator (SIO), a III-V semiconductor material, etc.). In one embodiment, the wafer 790 may include a plurality of first dies 710, as is known in the art. For example, the wafer 790 may include hundreds, thousands, tens of thousands, or more first die 710.

In one embodiment, the first die 710 may include a plurality of conductive pillars 712. The conductive pillars 712 may have a height H suitable for forming an electronic package including multiple dies stacked in a face-to-face configuration, such as described above. For example, the height H can be 20 μm or greater, 50 μm or greater, or 100 μm or greater. In one embodiment, the conductive posts 712 may be high aspect ratio posts. For example, the height of the conductive post: the width aspect ratio may be 2:1 or greater, 3:1 or greater, 5:1 or greater, or 10:1 or greater. In one embodiment, other interconnects may be substituted for conductive pillars 712. For example, the conductive posts may be replaced with copper core bumps or the like.

In one embodiment, the first die 710 may include a disable zone 715. In one embodiment, conductive pillars 712 may be formed only outside of the forbidden zone 715. In this way, a subsequently placed die may be positioned in the disable zone of the first die 710.

Referring now to fig. 7B, a perspective view of a process for mounting a second die 720 to a first die 710 is shown, in accordance with one embodiment. In one embodiment, a solder bump 723 may be formed on the first surface 721 of the second die 720. As indicated by the arrow, the second die 720 may be mounted to the first die 710. In particular, the first surface 721 of the second die 720 may be oriented such that it faces the first surface 711 of the first die 710. In one embodiment, the second die 720 may be mounted entirely within the disable zone 715 of the first die 710.

Referring now to fig. 7C, a perspective view of a process for mounting a third die 730 to a first die 710 is shown, according to one embodiment. In one embodiment, the third die 730 may include a plurality of conductive pillars 732 and a disabling zone 735. Conductive post 732 may be formed outside of the disabling zone 735. The disable zone 735 of the third die 730 may be sized such that it covers the second die 720 when the third die 730 is mounted to the first die 710, as indicated by the arrow. In one embodiment, the first surface 731 of the third die 730 may be mounted such that the first surface 731 faces the first surface 711 of the first die 710.

Referring now to fig. 7D, a cross-sectional illustration of the electronic package 700 after the first die 710 is mounted to the package substrate 770 is shown, in accordance with one embodiment. As shown, the second die 720 is proximate to the first die 710. The third die 730 may be spaced apart from the first die 710 by the second die 720. In one embodiment, the conductive pillars of the third die 730 are formed outside the perimeter of the second die 720. However, other configurations, such as those described in more detail above, may be formed with similar processes.

While specific examples of face-to-face stacked die configurations are provided with reference to fig. 1A-7D, it should be understood that other configurations may also be used. For example, a fewer number of dies, a greater number of dies, more than one die at a given Z height, different combinations of TSVs, use of conductive pillars, and/or use of RDLs may be used to provide a desired function and/or form factor for a given electronic package.

FIG. 8 illustrates a computing device 800 in accordance with an implementation of the invention. The computing device 800 houses a board 802. The board 802 may include a number of components, including but not limited to a processor 804 and at least one communication chip 806. The processor 804 is physically and electrically coupled to the board 802. In some implementations, the at least one communication chip 806 is also physically and electrically coupled to the board 802. In further implementations, the communication chip 806 is part of the processor 804.

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 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 a hard disk drive, a Compact Disc (CD), a Digital Versatile Disc (DVD), etc.).

The communication chip 806 enables wireless communication for transferring data to and from the computing device 800. 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 may not. The communication chip 806 may implement any of a variety of wireless standards or protocols, including but not limited to Wi-Fi (IEEE 802.11 family), WiMAX (IEEE 802.16 family), IEEE802.20, Long Term Evolution (LTE), Ev-DO, HSPA +, HSDPA +, HSUPA +, EDGE, GSM, GPRS, CDMA, TDMA, DECT, Bluetooth, derivatives thereof, and any other wireless protocol designated as 3G, 4G, 5G, and above. The computing device 800 may include a plurality of communication chips 806. For example, the first communication chip 806 may be dedicated to shorter range wireless communications such as Wi-Fi and Bluetooth, and the second communication chip 806 may be dedicated to longer range wireless communications such as GPS, EDGE, GPRS, CDMA, WiMAX, LTE, Ev-DO, and the like.

The processor 804 of the computing device 800 includes an integrated circuit die packaged within the processor 804. In some implementations of the invention, an integrated circuit die of a processor may be communicatively coupled to one or more stacked dies in a face-to-face configuration according to embodiments described herein. 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.

The communication chip 806 also includes an integrated circuit die packaged within the communication chip 806. According to another implementation of the invention, the integrated circuit die of the communication chip may be communicatively coupled to one or more stacked dies in a face-to-face configuration according to embodiments described herein.

The above description of illustrated implementations of the invention, 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 of the invention, as those skilled in the relevant art will recognize.

These modifications can 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 of the invention is to be determined entirely by the following claims, which are to be construed in accordance with established doctrines of claim interpretation. ‎

Example 1: an electronic package, comprising: a first die, wherein the first die comprises a plurality of first conductive ‎ interconnects extending from a first surface of the first die, and wherein ‎ the first die comprises a disabling zone; and a second die, wherein the second die is located entirely within the ‎ perimeter of the disabling zone of the first die, and wherein the ‎ first surface of the second die faces the first surface of the first die. ‎

Example 2: the electronic package of example 1, wherein the conductive interconnect has a height ‎ that is greater than a thickness of the second die. ‎

Example 3: the electronic package of example 1 or example 2, wherein the conductive interconnect has an aspect ratio ‎ of 3:1 or greater. ‎

Example 4: the electronic package of examples 1-3, wherein the second die is electrically coupled to the first die ‎ through a solder bump. ‎

Example 5: the electronic package of examples 1-4, wherein the first surface of the first die ‎ includes active devices, and wherein the first surface of the second die includes active devices. ‎

Example 6: the electronic package of examples 1-5, further comprising a third die, wherein the third die is entirely within a perimeter of the keep out zone ‎ of the first die, and wherein the third die comprises a plurality of posts ‎ extending from a first surface of the third die, wherein the plurality of posts ‎ extending from the first surface of the third die electrically couple the third die ‎ to the first die. ‎

Example 7: the electronic package of examples 1-6, wherein the second die is located ‎ between the first surface of the first die and the first surface of the third die. ‎

Example 8: the electronic package of examples 1-7, wherein the third die includes a disabling zone ‎, and wherein the second die is located above the disabling zone of the third ‎ die. ‎

Example 9: the electronic package of examples 1-8, wherein the second die is located entirely within a perimeter of the keep out zone of the third die ‎. ‎

Example 10: the electronic package of examples 1-9, wherein a portion ‎ of the second die is located above the keep-out zone of the third die. ‎

Example 11: the electronic package of examples 1-10, further comprising: a package substrate electrically coupled to the first die ‎ through the plurality of conductive interconnects.

Example 12: the electronic package of examples 1-11, wherein the package substrate includes ‎ recesses within a perimeter of the keep out zone of the first die. ‎

Example 13: the electronic package according to examples 1-12, wherein the package substrate includes ‎ an opening completely through the package substrate within a perimeter of the ‎ keep out zone of the first die. ‎

Example 14: the electronic package of examples 1-13, further comprising a third die and a fourth ‎ die, wherein the third die and the fourth die are entirely within the perimeter of the ‎ disable zone of the first die. ‎

Example 15: the electronic package of examples 1-14, wherein at least one of the second die, the ‎ third die, and the fourth die includes through substrate vias. ‎

Example 16: an electronic package, comprising: a first die, wherein the first die includes a disable zone; a second die, wherein the first surface of the first die faces ‎ the first surface of the second die, and wherein the second die is located within the perimeter of the disable zone ‎ of the first die; and a third die, wherein the third die includes a plurality of conductive pillars ‎ extending from a first surface of the third die, and wherein the ‎ conductive pillars electrically couple the third die to the first die.

Example 17: the electronic package of example 16, wherein the electronic package is a wafer ‎ level chip scale (WLCS) package.

Example 18: the electronic package of example 16 or example 17, wherein the electronic package is a fan ‎ out package. ‎

Example 19: the electronic package of examples 16-18, wherein the third die includes a disable zone, and wherein the second die is located at least partially within the disable zone of the third die. ‎

Example 20: the electronic package of examples 16-19, further comprising a molding layer over the ‎ first die, wherein the second die and the third die are embedded within the molding ‎ layer. ‎

Example 21: the electronic package of examples 16-20, wherein the third die is fully embedded ‎ within the molding layer. ‎

Example 22: the electronic package of examples 16-21, wherein the third die at least ‎ partially extends out of the molding layer, and wherein a bottom surface of the third die has a stand-off distance of ‎ about 50 μ ι η or greater from ‎ of an underlying Printed Circuit Board (PCB). ‎

Example 23: a computer system, comprising: a first die; a second die communicatively coupled to the first die, wherein the first ‎ surface of the first die faces the first surface of the second die; a third die, wherein a first surface of the third die faces ‎ the first surface of the first die, and wherein the third die is electrically coupled to the first die by ‎ plurality of conductive pillars; and a plurality of second level interconnects electrically coupled to the first ‎ surface of the first die, wherein the second die and the third die are located between the first surface of the first die and the second level interconnects ‎. ‎

Example 24: the computer system of example 23, wherein the plurality of second level ‎ interconnects are coupled to the first die through copper pillars extending from a ‎ first surface of the first die. ‎

Example 25: the computer system of example 23 or example 24, wherein the plurality of second levels ‎ are coupled to the first die in intercommunication through vias and traces in a redistribution layer.