Patent ID: 7015575

Claim:
An LSI package comprising: a substrate; an LSI chip that is mounted on or embedded in the substrate; a plurality of power supply terminals that are provided on the LSI chip; one or more source voltage supply terminals which are provided on one of the main surfaces of the substrate, and whose number is smaller than a number of the plurality of power supply terminals; and a capacitor element which is embedded in the substrate and a first end of which is earthed, wherein at least one of the source voltage supply terminals is connected to at least two of the plurality of power supply terminals on the LSI chip, in such a manner that a power supply path connected to the at least one source voltage supply terminal branches into at least two power supply paths in the substrate, a second end of the capacitor element is connected to the power supply path at a point before the power supply path branches, at least one of the plurality of power supply terminals requires a direct-current voltage of a different level than a direct-current voltage applied to a rest of the power supply terminals, and the at least one power supply terminal is connected, through a direct-current voltage conversion element that is embedded in or mounted on the substrate, to one of the source voltage supply terminals to which a different power supply terminal is also connected.