Microelectronic package having interconnected redistribution paths
View Patent ↗A microelectronic unit has a structure including a microelectronic element such as a semiconductor chip with a first contact disposed remote from the periphery of the structure. The unit further includes first and second redistribution conductive pads disposed near a periphery of the structure and a conductive path incorporating first and second conductors extending toward the first contact, these conductors being connected to one another adjacent the first contact. The conductive path is connected to the first contact, and can provide signal routing from the periphery of the unit to the contact without the need for long stubs. A package may include a plurality of such units, which may be stacked on one another with the redistribution conductive pads of the various units connected to one another.
1. A microelectronic unit comprising:
a unit structure including a semiconductor chip, said semiconductor chip including circuitry within an interior of said chip, said unit structure defining a first surface and a periphery;
a first contact on said semiconductor chip connected to the circuitry; and
first and second redistribution conductive pads disposed near the periphery of structure;
a first redistribution conductor connected to the first redistribution conductive pad;
a second redistribution conductor connected to the second redistribution conductive pad,
wherein the first and second conductors extend toward and are electrically connected to the first contact and are electrically connected to one another adjacent the first contact so as to form a conductive path extending between the first and second redistribution conductive pads, the conductive path limiting reflection of a signal propagating along the conductive path between the conductive pads and the circuitry within the interior of the chip.
2. The microelectronic unit of claim 1 wherein said redistribution conductive pads and said redistribution conductors are carried on said semiconductor chip.
3. The microelectronic unit of claim 1 wherein said semiconductor chip includes an element body having a front surface, said first contact and said redistribution conductive pads being exposed at said front surface.
4. The microelectronic unit of claim wherein said unit structure includes a dielectric unit substrate and said semiconductor chip, said redistribution conductors and said redistribution conductive pads being carried on said unit substrate.
5. The microelectronic unit of claim 4 wherein said semiconductor chip includes an element body having a front surface, said unit substrate overlying said front surface.
6. The microelectronic unit of claim 1 , wherein the first and second conductors comprise copper traces.
7. The microelectronic unit of claim 1 further comprising an interconnect element extending between said first and second conductors adjacent the first contact, said conductive path including said interconnect element.
8. The microelectronic unit of claim 7 further comprising a stub conductor extending between said interconnect element and said first contact so that said conductive path is connected to said first contact by said stub conductor, said stub conductor being shorter than said first and second conductors.
9. The microelectronic unit of claim 7 wherein said interconnect element extends over said first contact and is electrically connected to said first contact.
10. The microelectronic unit of claim 1 wherein said first and second conductors are both connected to said first contact.
11. The microelectronic unit of claim 10 wherein said first and second conductors are connected to one another only by said first contact.
12. A microelectronic package comprising a plurality of units as claimed in claim 1 and first and second terminals, the conductive paths of units being connected between said first and second terminals.
13. The microelectronic package of claim 12 wherein the conductive paths of the units are electrically connected in series between said first and second terminals.
14. The microelectronic package of claim 12 wherein the conductive paths of the microelectronic elements are electrically connected in parallel between said first and second terminals.
15. The microelectronic package of claim 12 wherein said units are superposed on one another in a stack.
16. The microelectronic package of claim 12 further comprising a package substrate, said first and second terminals being carried on said package substrate.
17. The microelectronic package of claim 12 wherein said first and second terminals are adapted for surface mounting to a circuit panel.
18. An assembly including the microelectronic package of claim 12 and a circuit panel having conductive features thereon, the terminals of the package being connected to the conductive features of the circuit panel.