Abstract:
A device includes first and second semiconductor chips. The first semiconductor chip includes an edge defining a periphery of the first semiconductor chip. The second semiconductor chip is greater in size than the first semiconductor chip. The second semiconductor chip is stacked over the first semiconductor chip so that the second semiconductor chip hangs over from the edge of the first semiconductor chip. The second semiconductor chip includes a plurality of wiring patterns including a first wiring pattern that positions over the edge of the first semiconductor chip, an insulating film which covers the wiring patterns and which includes on or more holes that expose one or more the wiring patterns, and one or more bump electrodes formed on the one or more the wiring patterns. Remaining one or ones of the wiring patterns is kept covered by the insulating layer and includes the first wiring pattern.

Description:
This application is based upon and claims the benefit of priority from Japanese patent application No. 2011-267988, filed on Dec. 7, 2011, the disclosure of which is incorporated herein in its entirety by reference. 
     BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     This invention relates to a semiconductor device. 
     2. Description of Related Art 
     In recent years, with miniaturization of electronic equipment embedding semiconductor devices or the like, demand for fining of the semiconductor devices has been intensifying. Therefore, development of the semiconductor devices advances in which a plurality of semiconductor chips are stacked over and the plurality of semiconductor chips are connected via penetration electrodes. 
     In general, in the semiconductor device in which the plurality of semiconductor chips are stacked over, in order to prevent bumps for connecting the semiconductor chips from rupturing resulting from a warp of the semiconductor chip, dummy bumps or reinforcing bumps (which will later be called “dummy bumps” also including the reinforcing bumps) are formed on each semiconductor chip (see, JP-A 2010-161102 which will be called Patent Document 1 and which corresponds to US 2010/0171208 A1). 
     However, in a case where semiconductor chips having different sizes such as a logic chip and a memory chip of Patent Document 1 are stacked over, dummy bumps formed on one semiconductor chip may be positioned to edges (edge portions) of another semiconductor chip and it is feared that crack occurs in the edge portions of the other semiconductor chip in the manner which will later be described in conjunction with  FIGS. 9A and 9B . 
     SUMMARY 
     In one aspect of the present invention, there is provided a device that includes first and second semiconductor chips. The first semiconductor chip includes an edge defining a periphery of the first semiconductor chip. The second semiconductor chip is greater in size than the first semiconductor chip. The second semiconductor chip is stacked over the first semiconductor chip so that the second semiconductor chip hangs over from the edge of the first semiconductor chip. The second semiconductor chip includes a plurality of upper layer wiring patterns, a first insulating film, and one or more main surface bump electrodes. The plurality of upper layer wiring patterns includes a first wiring pattern that positions over the edge of the first semiconductor chip. The first insulating film covers the upper layer wiring patterns. The first insulating film includes one or more holes that expose one or more the upper layer wiring patterns. The one or more main surface bump electrodes are formed on the one or more the upper layer wiring patterns. Remaining one or ones of the upper layer wiring patterns are kept covered by the first insulating layer. The remaining one or ones of the upper layer wiring patterns include the first wiring pattern. 
     In another aspect of the present invention, there is provided a device that includes first and second semiconductor chips. The first semiconductor chip includes an edge defining a periphery of the first semiconductor chip. The second semiconductor chip is greater in size than the first semiconductor chip. The second semiconductor chip is stacked over the first semiconductor chip so that the second semiconductor chip hangs over from the edge of the first semiconductor chip. The second semiconductor chip includes a plurality of upper layer wiring patterns, one ore more main surface bump electrodes. The upper layer wiring patterns include a first wiring pattern that positions over the edge of the first semiconductor chip. The one or more main surface bump electrodes are formed on one or more the upper layer wiring patterns to be in contact respectively with the one or more the upper layer wiring patterns. Remaining one or ones of the upper layer wiring patterns are free from being in contact with any one of the main surface bump electrodes. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The above features and advantages of the present invention will be more apparent from the following description of certain preferred embodiments taken in conjunction with the accompanying drawings, in which: 
         FIG. 1  is a sectional view of a semiconductor device according to a first exemplary embodiment of this invention; 
         FIG. 2  is a plan vies of a semiconductor chip according to a first exemplary embodiment of this invention; 
         FIG. 3A  is a sectional view of the semiconductor chip according to the first exemplary embodiment of this invention; 
         FIG. 3B  is a bottom view of the semiconductor chip according to the first exemplary embodiment of this invention; 
         FIG. 4A  is a sectional view of the semiconductor chip according to the first exemplary embodiment of this invention; 
         FIG. 4B  is a bottom view of the semiconductor chip according to the first exemplary embodiment of this invention; 
         FIG. 4C  is a plan view showing a stacked state of the semiconductor chip according to the first exemplary embodiment of this invention; 
         FIG. 5A  is a sectional view of the semiconductor chip according to a second exemplary embodiment of this invention; 
         FIG. 5B  is a bottom view of the semiconductor chip according to the second exemplary embodiment of this invention; 
         FIG. 5C  is a plan view showing a stacked state of the semiconductor chip according to the second exemplary embodiment of this invention; 
         FIG. 6A  is a sectional view of a design stage of the semiconductor chip according to a second exemplary embodiment of this invention; 
         FIG. 6B  is a bottom view of the design stage of the semiconductor chip according to the second exemplary embodiment of this invention; 
         FIG. 6C  is a plan view showing a stacked state of the design stage of the semiconductor chip according to the second exemplary embodiment of this invention; 
         FIG. 7  is a sectional view of the semiconductor chip according to the second exemplary embodiment of this invention; 
         FIG. 8A  is a plan view of a semiconductor chip according to an exemplary embodiment of this invention; 
         FIG. 8B  is a plan view of a semiconductor chip according to an exemplary embodiment of this invention; 
         FIG. 9A  is a plan view of a related semiconductor chip; and 
         FIG. 9B  is a sectional view of a stacked state of the related semiconductor chip. 
     
    
    
     DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS 
     Before describing of the present invention, the related art will be explained in detail with reference to  FIGS. 9A and 9B  in order to facilitate the understanding of the present invention. 
     A related semiconductor device comprises a first semiconductor chip  101  and two second semiconductor chips  102  each of which has a plane size larger than that of the first semiconductor chip  101 . The first semiconductor chip  101  has edges  101   a  which extend parallel to each other in a predetermined direction. Each second semiconductor chip  102  comprises dummy bumps  103 . 
     When the two second semiconductor chips  102  are stacked over the first semiconductor chip  101 , there is a case where the dummy bumps  103  of a lower one of the second semiconductor chips  102  make contact with the edges  101   a  of the first semiconductor chip  101  that are disposed in the inside of the second semiconductor chips  102  on viewing a plane. As a result, it is feared that any crack occurs the first semiconductor chip  101 . In  FIG. 9A , the first semiconductor chip  101  is depicted at a broken line. 
     The invention will be now described herein with reference to illustrative embodiments. Drawings used in the following description are for describing configurations of exemplary embodiments of this invention, and therefore sizes, thicknesses, dimensions, or the like of respective parts illustrated may be different from relationships of actual sizes. In addition, materials or the like illustrated in the following description are one examples, this invention is not always limited thereto. Those skilled in the art will recognize that many alternative embodiments can be accomplished using the teachings of the present invention and that the invention is not limited to the embodiments illustrated for explanatory purposes. 
     First Exemplary Embodiment 
     As shown in  FIG. 1 , a semiconductor device  1  according to a first exemplary embodiment of this invention comprises a wiring substrate  2  having a main surface  2   a  and a rear surface  2   b , a plurality of semiconductor chips  3 ,  4 , and  5  which are stacked over the main surface  2   a  (one surface) of the wiring substrate  2 , a sealing resin  6  which is formed on the main surface  2   a  of the wiring substrate  2  and which covers the respective semiconductor chips  3 ,  4 , and  5 , and external terminals  7  formed on the rear surface  2   b  (another surface) of the wiring substrate  2 . 
     The wiring substrate  2  may comprise a circuit board, for example, an interposer or the like, comprising a resin in which a re-wiring layer is formed. Though the re-wiring layer formed in the wiring substrate  2 , the semiconductor chip  3  stacked over the main surface  2   a  of the wiring substrate  2  and the external terminals  7  formed on the rear surface  2   b  of the wiring substrate  2  are electrically connected to each other. 
     The semiconductor chip  3 , that is stacked on the wiring substrate  2 , comprises a logic chip such as, for example, a system on chip (SOC). The semiconductor chip  4 , that is stacked on the semiconductor chip  3 , comprises a memory chip such as, for example, a dynamic random access memory (DRAM). he semiconductor chip  5 , that is stacked on the semiconductor chip  4 , similarly comprises a memory chip such as, for example, a dynamic random access memory (DRAM). 
     The semiconductor chip  4  and the semiconductor chip  5  are substantially equal in size to each other. Compared with the semiconductor chips  4  and  5 , the semiconductor chip  3  has a smaller plane size. Specifically, on viewing cross section, the semiconductor chip  3  has a length in a width direction (a transversal direction in  FIG. 1 ) which is shorter than that of each of the semiconductor chips  4  and  5 . 
     The semiconductor chips  3 ,  4 , and  5  respectively have main surfaces  3   a ,  4   a , and  5   a  (one surfaces) on which a plurality of main surface bump electrodes  8 ,  9 , and  10  are formed, respectively. The semiconductor chips  3 ,  4 , and  5  respectively have rear surfaces  3   b ,  4   b , and  5   b  (other surfaces) on which a plurality of rear surface bump electrodes  11 ,  12 , and  13  are formed, respectively. Although  FIG. 1  illustrates an example in which the respective semiconductor chips  3 ,  4 , and  5  are implemented so that the main surfaces  3   a ,  4   a , and  5   a  (the one surfaces) of the respective semiconductor chips  3 ,  4 , and  5  are disposed to upper side while the rear surfaces  3   b ,  4   b , and  5   b  (the other surfaces) of the respective semiconductor chips  3 ,  4 , and  5  are disposed to lower side, namely, illustrates an example in which the respective semiconductor chips  3 ,  4 , and  5  are implemented in a face-up type, this invention is not limited thereto. Specifically, the respective semiconductor chips  3 ,  4 , and  5  may be implemented so that the rear surfaces  3   b ,  4   b , and  5   b  (the other surfaces) of the respective semiconductor chips  3 ,  4 , and  5  are disposed to upper side while the main surfaces  3   a ,  4   a , and  5   a  of the respective semiconductor chips  3 ,  4 , and  5  are disposed to lower side, namely, the respective semiconductor chips  3 ,  4 , and  5  may be implemented in a flip-chip type. 
     Among the plurality of bump electrodes  8  to  13 , the bump electrodes electrically connected to internal circuits  14  formed in the respective semiconductor chips  3 ,  4 , and  5  serve as a part of penetration electrodes  15  (Through Silicon Via; TSV). That is, the bump electrodes electrically connected to the internal circuits  14  formed in the respective semiconductor chips  3 ,  4 , and  5  act to convey, to the internal circuits, signals and power supply voltages supplied from the external of the semiconductor chips via the external terminals or the other semiconductor chips. 
     On the other hand, the bump electrodes, which are not electrically connected to the internal circuits  14 , are dummy bump electrodes  16 . The dummy bump electrodes  16  are so that edge portions  3   c ,  4   c , and  5   c  of the respective semiconductor chips  3 ,  4 , and  5  do not hit to each other in a case of stacking over the semiconductor chips  3 ,  4 , and  5 . In the embodiment, the dummy bump electrodes  16  are disposed so as to not overlap (hit) with the edge portions  3   c  of the semiconductor chip  3 , this will be described in detail, below. 
     Although  FIG. 1  illustrates an example where the dummy bump electrodes  16  are not electrically connected to the internal circuits, this invention is not limited thereto. It may be also possible to give still further stability to a power supply potential of the semiconductor device  1  by configuring so that the dummy bump electrodes are connected to power supply lines within the semiconductor chips. In either case, the dummy bump electrodes  16  have a function so that the edge portions  3   c ,  4   c , and  5   c  of the respective semiconductor chips  3 ,  4 , and  5  do not hit to each other in the case of stacking over the semiconductor chips  3 ,  4 , and  5 . 
     Although the description has been made about a case where the three semiconductor chips are stacked over the wiring substrate  2  in this exemplary embodiment, the number of the semiconductor chips is not limited thereto, and any number of the semiconductor chips may be stacked over the wring substrate  2 . In addition, although the description has been made about a case where the semiconductor chip disposed to the wiring substrate  2  at the closest position comprises the logic chip in this exemplary embodiment, alternatively the semiconductor chip in question may comprise a memory chip and the logic chip may be disposed between the memory chips. 
     Now, the description will proceed to a configuration in a plane of the semiconductor chip  4 . 
     As illustrated in  FIG. 2 , the semiconductor chip  4  has a configuration of the so-called Wide-IO DRAM and has a configuration where two or more (four in  FIG. 2 ) DRAMs are disposed on a semiconductor substrate. In the description below, the description will be made as regards such that the respective DRAMs are referred to as first through fourth channels  21 A,  21 B,  21 C, and  21 D, respectively, 
     Each of the first through the fourth channels  21 A to  21 D comprises a penetration electrode array (TSV array)  22  in which the penetration electrodes  15  comprising a plurality of terminals for transmitting and receiving data, a command, and an address are disposed, and a storage area portion  23  including an internal control circuit and a memory cell array. 
     Each of the first through the fourth channels  21 A to  21 D can independently operate various operations such as a read operation, a write operation, a refresh operation, and so on under a control of a control circuit in the semiconductor chip  3  disposed at a lower side of the semiconductor chip  4 . 
     The semiconductor chip  4  comprises two or more (four in  FIG. 4 ) dummy bump array areas (DB arrays)  24  each of which includes a plurality of dummy bump electrodes  16 . 
     Each of the dummy bump array areas  24  is provided for a corresponding one of the first through the fourth channels  21 A to  21 D. Each of the dummy bump array areas  24  is disposed between the storage area portion  23  of the corresponding one of channels  21 A to  21 D and a circumferential edge portion of the semiconductor chip  4 . In other words, the internal control circuit and the memory cell array are not disposed between each dummy bump array area  24  and a peripheral portion of the semiconductor chip  4  that is closest thereto. 
     Although  FIG. 2  illustrates a case where the dummy bump array areas  24  are disposed in proximity to respective four corners of the semiconductor chip  4  having a rectangular shape, this invention is not limited thereto. 
     For example, it is acceptable to configure so that the respective dummy bump areas  24  are disposed only in proximity to a pair of (two) corners in the four corners of the semiconductor chip  4  having the rectangular shape that are positioned in a diagonal line. 
     Although a chip configuration of the Wide-IO DRAM is illustrated as an example of the semiconductor chip  4 , this invention is not limited thereto. 
     Now, the description will proceed to a cross-sectional configuration of the storage area portion  23  of the semiconductor chip  4 . 
     As shown in  FIGS. 3A and 3B , the storage area portion  23  of the semiconductor chip  4  comprises the semiconductor substrate  31 , first through fifth interlayer insulating films  32 ,  33 ,  34 ,  35 , and  36 , first through fourth wiring layers  37 ,  38 ,  39 , and  40  constituting a multi-level wiring structure, a polyimide layer  41 , a rear surface insulating layer  42 , a plurality of main surface bump electrodes  9 , a plurality of rear surface bump electrodes  12 , a plurality of substrate through conductors  17 , and insulating rings  43  formed in the semiconductor substrate  31 . 
     The first interlayer insulating film  32  is provided on a main surface  31   a  (one surface) of the semiconductor substrate  31 , the first wiring layer  37  having a predetermined pattern is formed on the first interlayer insulating film  32  and serves as lower layer wiring patterns  51 . In addition, the second interlayer insulating film  33  is provided on the first interlayer insulating film  32  so as to cover the first wiring layer  37 , and the second wiring layer  38  having a predetermined pattern is formed on the second interlayer insulating film  33 . 
     Likewise, the third interlayer insulating film  34  is provided on the second interlayer insulating film  33  so as to cover the second wiring layer  38 , the third wiring layer  39  is formed on the third interlayer insulating film  34 , the fourth interlayer insulating film  35  is provided on the third interlayer insulating film  34  so as to cover the third wiring layer  39 , the fourth wiring layer  40  is formed on the fourth interlayer insulating film  35 , and the fifth interlayer insulating film  36  (the insulating film) is provided on the fourth interlayer insulating film  35  so as to cover the fourth wiring layer  40 . 
     In addition, the second, the third, and the fourth wiring layers  38 ,  39 , and  40  comprise layers including first intermediate layer wiring patterns  52 , second intermediate layer wiring patterns  53 , and upper layer wiring patterns  54 , respectively. 
     In addition, the polyimide layer  41  is formed on the fifth interlayer insulating film  36 . The polyimide layer  41  has opening portions  41   a  at positions corresponding to the upper layer wiring patterns  54 . The rear surface insulating film  42  is formed on a rear surface  31   b  (another surface) of the semiconductor substrate  31  that is on the other side of the main surface  31   a  thereof. The rear surface insulating film  42  has opening portions  42   a  at positions corresponding to the lower layer wiring patterns  51 . 
     The main surface bump electrodes  9  are formed in the opening portions  41   a . The main surface bump electrodes  9  are electrically connected to the upper layer wiring patterns  54  by penetrating the fifth interlayer insulating film  36 . 
     In addition, the substrate through conductors  17  and the rear surface bump electrodes  12  are formed in the opening portions  42   a . The substrate through conductors  17  and the rear surface bump electrodes  12  are electrically connected to the lower layer wiring patterns  51  by penetrating the semiconductor substrate  31  and the first interlayer insulating film  32 . The rear surface bump electrodes  12  are exposed from the rear surface  31   b  of the semiconductor substrate  31 . 
     Within the semiconductor chip  4 , the internal circuits  14  are mainly provided in the semiconductor substrate  31  and in the first interlayer insulating film  32 . The internal circuits  14 , the main surface bump electrodes  9 , and the rear surface bump electrodes  12  are electrically connected to each other via various types of plugs, the first through the fourth wiring layers  37  to  40 , and the substrate through conductors  17 . In the manner which is described above, the bump electrodes  9 ,  12  and the substrate through conductors  17 , which are formed in the storage area portion  23 , are electrically connected to the internal circuits  14 , and therefore serve as the penetration electrodes  15 . 
     In addition, the insulating rings  43  are formed in the semiconductor substrate  31  so as to surround the substrate through conductors  17 . The insulating rings  43  have a function for preventing currents flowing through the substrate through conductors  17  from flowing in the semiconductor substrate  31 . 
     Now, the description will proceed to a cross-sectional configuration of the dummy bump array area  24  of the semiconductor chip  4 . 
     As shown in  FIGS. 4A and 4B , the dummy bump array area  24  of the semiconductor chip  4  also comprises the semiconductor substrate  31 , the first through the fifth interlayer insulating films  32  to  36 , the first through the fourth wiring layers  37  to  40 , the polyimide layer  41 , the rear surface insulating layer  42 , the plurality of main surface bump electrodes  9 , the plurality of rear surface bump electrodes  12 , the plurality of substrate through conductors  17 , and the insulating rings  43  formed in the semiconductor substrate  31 . The dummy bump array area  24  is basically similar in structure to the storage area portion  23 . Hereafter, the description will be omitted as regards parts similar to the storage area portion  23  as appropriate. 
     In the dummy bump array area  24 , the main surface bump electrodes  9 , the rear surface bump electrodes  12 , and the substrate through conductors  17  are not electrically connected to the internal circuits  14 , and serve as the dumpy bump electrodes  16 . 
       FIG. 4A  illustrates an example where first through third main surface bump electrodes  9   a ,  9   c , and  9   d , first through third rear surface bump electrodes  12   a ,  12   c , and  12   d , and first through third substrate through conductors  17   a ,  17   c , and  17   d  are formed. It will be assumed that a distance between the first rear surface bump electrode  12   a  and the second rear surface bump electrode  12   c  is represented by b while a distance between the second rear surface bump electrode  12   c  and the third rear surface bump electrode  12   d  is represented by a. Under the circumstances, the distance b is longer than the distance a and it is preferable that the distance b is longer than a distance obtained by adding a diameter of the rear surface bump electrode  12  to a length which is double in the distance a. 
     The illustrated dummy bump array area  24  of the semiconductor chip  4  comprises lower layer wiring patterns  51   a ,  51   b ,  51   c ,  51   d , first intermediate layer wiring patterns  52   a ,  52   b ,  53   c ,  53   d , second intermediate layer wiring patterns  53   a ,  53   b ,  53   c ,  53   d , and upper layer wiring patterns  54   a ,  54   b ,  54   c ,  54   d  (a plurality of wiring patterns). Hereafter, a particular lower layer wiring pattern  51   n  (n=a, b, c, d), the first intermediate layer wiring pattern  52   n  (n=a, b, c, d) positioned thereabove, the second intermediate layer wiring pattern  53   n  (n=a, b, c, d) positioned thereabove, the upper layer wiring pattern  54   n  (n=a, b, c, d) positioned thereabove, and the plugs for electrically connecting them are collectively called a wiring pattern portion  55   n  (n=a, b, c, d). The description will be made on the assumption that the illustrated dummy bump array area  24  comprises four wiring pattern portions  55   n  (n=a, b, c, d). 
     The four lower layer wiring patterns  51   a ,  51   b ,  51   c ,  51   d  are spaced uniformly and are disposed so that a distance between adjacent two of the lower layer wiring patterns  51   a ,  51   b ,  51   c ,  51   d  is equal to a 1 . Likewise, the four upper layer wiring patterns  54   a ,  54   b ,  54   c ,  54   d  are spaced uniformly and are disposed so that a distance between adjacent two of upper layer wiring patterns  54   a ,  54   b ,  54   c ,  54   d  is equal to a 2 . 
     Herein, it is preferable that the distance a between the rear surface bump electrode  12   c  and the rear surface bump electrode  12   d  is shorter than the distance a 1  between the adjacent two of the lower layer wiring patterns  51   a ,  51   b ,  51   c ,  51   d , namely, the rear surface bump electrode  12  is larger in size than the lower layer wiring patterns  51   a ,  51   b ,  51   c ,  51   d.    
     Among the four wiring pattern portions  55   a ,  55   b ,  55   c ,  55   d , the first, the third, and the fourth wiring pattern portions  55   a ,  55   c , and  55   d  are connected to the first through the third main surface bump electrodes  9   a ,  9   c , and  9   d , respectively, and are connected to the first through the third rear surface bump electrodes  12   a ,  12   c , and  12   c , respectively. 
     On the other hand, the remaining one wiring pattern portion  55   b  (the second wiring pattern portion from the left in  FIG. 4A ) is not provided with the main surface bump electrode, with the substrate through conductor, and with the rear surface bump electrode. 
     In addition, the second wiring pattern portion  55   b  is configured so as to be disposed over the edge  3   c  of the semiconductor chip  3  (see,  FIG. 1 ) which is disposed at the lower side of the semiconductor chip  4 . In other words, a second lower layer wiring pattern  51   b  (the second wiring portion  55   b ) is disposed at a position which overlaps to the edge  3   c  of the semiconductor chip  3  on viewing plane as shown in  FIG. 4C . 
     In the manner which is described above, in this exemplary embodiment, the dummy bump array area  24  is configured to comprise at least one of the plurality of lower layer wiring patterns  51  that is not connected to the substrate through conductors, and to the rear surface bump electrodes. 
     As a result, upon stacking over the semiconductor chip  4 , the lower layer wiring patterns  51 , which are not connected to the rear surface bump electrodes, are disposed over the edge  3   c  of the semiconductor chip  3  disposed at the lower side thereof, it is therefore possible to prevent any crack from occurring in the edge portion  3   c  of the semiconductor chip  3  disposed at the lower side thereof. 
     Furthermore, in the manner which is described above, in this exemplary embodiment, the dummy bump array area  24  is configured to comprise at least one of the plurality of upper layer wiring patterns  54  that are not connected to the main surface bump electrodes. 
     As a result, upon stacking over the semiconductor chip  4  over the semiconductor chip  3  in the flip-chip type, it is possible to prevent any crack from occurring in the edge  3   c  of the semiconductor chip  3  disposed at the lower side thereof, it is therefore possible to prevent any crack from occurring in the edge  3   c  of the semiconductor chip  3  disposed at the lower side thereof. 
     In addition, in structure of the semiconductor chip  4  according to this exemplary embodiment, it is possible to design, in a designing stage, the semiconductor chip  4  so that the plurality of main surface bump electrodes  9  and the plurality of rear surface bump electrodes  12  are disposed at substantially equal intervals (a in  FIG. 4A ) and thereafter to do not provide with only the main surface bump electrodes  9 , the rear surface bump electrodes  12 , and the substrate through conductors  17  which are scheduled to provide at the positions overlapping to the edge  3   c  of the semiconductor chip  3  in plane with regard to a size of the semiconductor chip  3  stacked. 
     And, at this time, by stopping only formation of the main surface bump electrodes  9 , the rear surface bump electrodes  12 , and the substrate through conductors  17  while leaving the wiring pattern portions  55  without deleting the wiring pattern portions  55 , it is possible to enjoy an effect so as to circumvent the need to redesign wiring layers included in the multi-level wiring structure and to change mask for manufacturing the wiring layers included in the multi-level wiring structure. 
     Second Exemplary Embodiment 
     Referring now to  FIG. 5A ,  5 B,  5 C,  6 A,  FIGS. 6B , and  6 C, the description will proceed to a semiconductor device according to a second exemplary embodiment of this invention. The second exemplary embodiment is a modified example of the first exemplary embodiment and therefore the description will be omitted as regards to similar parts as appropriate. Also in the second exemplary embodiment, the description will proceed to the semiconductor device in which a semiconductor chip  4 A is stacked over the semiconductor chip  3  as shown in  FIG. 1 . 
     The dummy bump array area  24  of the semiconductor chip  4 A according to the second exemplary embodiment is different from that according to the first exemplary embodiment and is formed so that each of a lower layer wiring pattern  61 , a first intermediate layer wiring pattern  62 , a second intermediate layer wiring pattern  63 , and an upper layer wiring pattern  64  is continuous (contiguous). 
     Other configurations are similar to those of the first exemplary embodiment. A distance between the first rear surface bump electrode  12   a  and the second rear surface bump electrode  12   c  is equal to b while a distance between the second surface bump electrode  12   c  and the third rear surface bump electrode  12   d  is equal to a. Specifically, the dummy bump array area  24  of the semiconductor chip  4 A according to the second exemplary embodiment is configured so that only one of the rear surface bump electrodes  12  spaced uniformly (one depicted at a broken line at the second position from the left in  FIG. 5A ) is eliminated. 
     As shown in  FIG. 5C , upon stacking the semiconductor chip  4 A over the semiconductor chip  3 , the semiconductor device according to the second exemplary embodiment is configured so that the rear surface bump electrode  12  is not provided to at a position which overlaps to the edge portion  3   c  of the semiconductor chip  3  on viewing plane. 
     In the manner which is similar to the first exemplary embodiment, in the second exemplary embodiment, it is possible to prevent any crack from occurring in the edge portion  3   c  of the semiconductor chip  3  disposed at the lower side because the bump electrodes are not connected above the edge portion  3   c  of the semiconductor chip  3  disposed to the lower side upon stacking over the semiconductor chip. 
     Inasmuch as the semiconductor device according to the second exemplary embodiment is configured so that the respective wiring patterns  61  to  64  become continuous wiring layers, it is possible to provide the main surface bump electrodes  9 , the rear surface bump electrodes  12 , and the substrate through conductors  17  at any positions in the dummy bump array area  24  without redesigning the wiring layers included in the multi-level wiring structure and without changing masks for manufacturing the multilayer wiring layer. 
     In the first exemplary embodiment, the description has been made about that it is possible to prevent any edge crack of the semiconductor chip  3  without redesigning the wiring layers included in the multi-level wiring structure by deleting only the main surface bump electrodes  9 , the rear surface bump electrodes  12 , and substrate through conductors  17  which are located at the position overlapping to the edge portion  3   c  of the semiconductor chip  3  in plane. 
     It is perfectly understandable that the number of the bump electrodes  9  and  12  decrease by deleting the bump electrodes  9  and  12 , and it is therefore feared that the entire strength for supporting the semiconductor chip  5  stacked over the semiconductor chip  4  decreases. 
     Hence, the semiconductor device according to the second exemplary embodiment not only deletes the bump electrodes  9  and  12  located at the position overlapping to the edge portion  3   c  of the semiconductor chip  3  in plane but also can make alternative bump electrodes  9  and  12  and alternative substrate through conductors  17  at positions which do not overlap to the edge portion  3   c  of the semiconductor chip  3  instead of the deleted bump electrodes  9  and  12 . 
     More specifically, the semiconductor device first is designed in a design stage so that a plurality of bump electrodes are disposed at substantially equal intervals one another as shown in  FIGS. 6A ,  6 B, and  6 C. Subsequently, if the bump electrodes overlap to the edge portion  3   c  of the semiconductor chip  3  stacked in plane, only the overlapped bump electrodes  9  and  12  and overlapped substrate through conductors  17  may be moved to other positions as shown in an arrow X of  FIG. 5A . 
     In other words, the semiconductor chip  4 A is configured so as to easily move the bump electrodes  9  and  12  and the substrate through conductors  17  to any positions in the predetermined dummy bump array area  24 . 
     For this reason, even if the edge portion  3   c  of the semiconductor chip  3  and the rear surface bump electrodes  12  of the semiconductor chip  4 A overlap to each other, it is possible to prevent any crack of the semiconductor chip  3  without decreasing the entire strength for supporting the semiconductor chip  5 . 
     Although the description has been made about a case where any of the lower layer wiring pattern  61 , the first intermediate layer wiring pattern  62 , the second intermediate wiring pattern  63 , and the upper layer wiring pattern  64  is formed so as to be continuous, this invention is not limited thereto. For example, the respective intermediate layer wiring patterns may not be formed or the respective intermediate layer wiring patterns may be formed as a particular pattern  71  as shown in  FIG. 7 . 
     This is because it is sufficient that there are only the lower layer wiring pattern  61  (on forming the substrate through conductors  17  and the rear surface bump electrodes  12 ) and the upper layer wiring pattern  64  (on forming the main surface bump electrodes  9 ) each of which serves as an edge stopper on forming in order to form the lower layer wiring pattern  61 , the first intermediate layer wiring pattern  62 , the second intermediate layer wiring pattern  63 , and the upper layer wiring pattern  64 , and there is no inconvenience even if the respective intermediate layer wiring patterns have any structure. 
     In addition, by deleting the respective intermediate layer wiring patterns, it is possible to use, as a region for arranging normal interconnection lines (power supply lines or signal lines), the second layer  38  and the third layer  39  among the multi-level wiring structure of the dummy bump array area  24 . 
     Although the invention has been particularly shown and described with reference to exemplary embodiments thereof, the invention is not limited to these embodiments. It will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the sprit and scope of the present invention as defined by the claims. 
     For example, this invention may be applicable to a semiconductor chip which composes a stacked semiconductor device and which comprises a dummy bump array (a plurality of dummy bump electrodes) for preventing chip edges from making contact with semiconductor chips stacked upper side and lower side and itself. 
     In addition, the dummy bump array areas  24  may be disposed in four corners of the rectangular semiconductor chip  4  so as to form an L-shape along the respective corners as shown in  FIG. 8A  and may be formed at areas extending toward a center from the middle of respective four sides of the rectangular semiconductor chip  4  as shown in  FIG. 8B . 
     By configuring in such as a manner, it is possible to move not only in the longitudinal direction but also in the transversal direction on changing arrangement positions of the bump electrodes. 
     Furthermore, the semiconductor chip according to this invention may comprise the wiring pattern portions  55  formed in the dummy bump array areas  24  some of which are not connected to the main surface bump electrodes or the substrate through conductors, or the rear surface bump electrodes. 
     More specifically, when the semiconductor chip is stacked over in the flip-chip type, the semiconductor chip according to this invention may be configured so that the substrate through conductors and the rear surface bump electrodes are formed to the respective lower layer wiring patterns  51  of the plurality of wiring pattern portions  55  formed in the dummy bump array areas  24  while the main surface bump electrodes are not formed to at least one upper layer wiring pattern  54  of the plurality of wiring pattern portions  55 . 
     Likewise, when the semiconductor chip is stacked over in the face-up type, the semiconductor chip according to this invention may be configured so that the main surface bump electrodes are formed to the respective upper layer wiring patterns  54  of the plurality of wiring pattern portions  55  formed in the dummy bump array areas  24  while the substrate through conductors and the rear surface bump electrodes are not formed to at least one lower layer wiring pattern  51  of the plurality of wiring pattern portions  55 . 
     That is to say, in a case of implementing the semiconductor chip  4  on the semiconductor chip  3 , among the plurality of main surface bump electrodes and the plurality of rear surface bump electrodes which form the plurality of dummy bump electrodes formed in the dummy bump array areas  24  of the semiconductor chip  4 , by eliminating at least one of the main surface bump electrodes  9  or the rear surface bump electrodes  12  that is formed at a surface of the semiconductor chip  4  that is opposed to the semiconductor chip  3 , namely, by eliminating the main surface bump electrodes  9  or the rear surface bump electrodes  12  which are positioned at edges of the semiconductor chip  3 , it is possible to suppress any crack from occurring in the edges of the semiconductor chip  3 . 
     INDUSTRIAL APPLICABILITY 
     This invention may be widely used in manufacturing industries for manufacturing semiconductor devices because this invention relates to the semiconductor device.