Integrated circuit package system having cavity

1. A method of manufacturing an integrated circuit package system comprising:

providing a carrier having a first side and a second side;

mounting an integrated circuit over the carrier with the first side facing the integrated circuit;

attaching an external interconnect to the second side;

forming an encapsulation over the integrated circuit and around the external interconnect with the encapsulation and the second side forming a cavity, the external interconnect exposed from the encapsulation and the second side exposed in the cavity;

providing a mountable structure;

attaching an un-encapsulated conductive structure between the external interconnect and the mountable structure, wherein the un-encapsulated conductive structure has a same structure and is made of a same conductive as the external interconnect; and

mounting an encapsulated integrated circuit on the mountable structure such that the encapsulated integrated circuit nests entirely within the cavity.

2. The method as claimed in claim 1 wherein forming the encapsulation includes exposing the external interconnect at a bottom side of the encapsulation.

3. The method as claimed in claim 1 wherein forming the encapsulation includes forming a bottom side facing away from the carrier and planar with the external interconnect.

4. The method as claimed in claim 1 wherein attaching the external interconnect includes attaching the external interconnect with a reduced dimension.

5. The method as claimed in claim 1 wherein forming the encapsulation includes forming the encapsulation having a groove in a bottom of the encapsulation and the external interconnect exposed in the groove.

6. The method as claimed in claim 5 wherein attaching the un-encapsulated conductive structure includes forming the external interconnect within the groove.

7. The method as claimed in claim 5 wherein attaching the un-encapsulated conductive structure includes forming the un-encapsulated conductive structure within the groove.

8. The method system as claimed in claim 1 further comprising mounting an electrical interconnect to the mountable structure.

9. A method of manufacturing an integrated circuit package system comprising:

providing a carrier having a first side and a second side;

mounting an integrated circuit over the carrier with the first side facing the integrated circuit;

attaching an external interconnect to the second side;

forming an encapsulation over the integrated circuit and around the external interconnect including:

forming the encapsulation having a bottom side facing away from the carrier and with the encapsulation and the second side forming a cavity, the second side exposed in the cavity, and

exposing the external interconnect at the bottom side;

providing a mountable structure;

attaching a un-encapsulated solder ball between the external interconnect and the mountable structure; and

mounting an encapsulated integrated circuit on the mountable structure such that the encapsulated integrated circuit nests entirely within the cavity.

10. The method as claimed in claim 9 further comprising:

attaching an electrical interconnect under the mountable structure.

11. The method as claimed in claim 9 wherein attaching the external interconnect includes attaching the external interconnect with a reduced dimension.

12. The method as claimed in claim 9 wherein forming the encapsulation includes forming the encapsulation having a groove in a bottom of the encapsulation and the external interconnect exposed in the groove.

13. The method as claimed in claim 9 further comprising mounting an electrical interconnect to the mountable structure.

14. An integrated circuit package system comprising:

a carrier having both a first side and a second side;

an integrated circuit over the carrier with the first side facing the integrated circuit;

an external interconnect attached to the second side;

an encapsulation over the integrated circuit and around the external interconnect with the encapsulation and the second side forming a cavity, the external interconnect exposed from the encapsulation and the second side exposed in the cavity;

a mountable structure;

an un-encapsulated conductive structure between the external interconnect and the mountable structure, wherein the un-encapsulated conductive structure has a same structure and is made of a same conductive material as the external interconnect; and

an encapsulated integrated circuit over the mountable structure, wherein the encapsulated integrated circuit nests entirely within the cavity, and wherein the external interconnect is over the mountable structure.

15. The system as claimed in claim 14 wherein the external interconnect is exposed at a bottom side of the encapsulation.

16. The system as claimed in claim 14 wherein the encapsulation includes a bottom side facing away from the carrier and planar with the external interconnect.

17. The system as claimed in claim 14 wherein the external interconnect has a reduced dimension.

18. The system as claimed in claim 14 wherein the un-encapsulated conductive structure includes a solder ball.

19. The system as claimed in claim 14 wherein the encapsulation has a groove in a bottom of the encapsulation and the external interconnect exposed in the groove.

20. The system as claimed in claim 19 wherein the un-encapsulated conductive structure is within the groove.