An integrated circuit (IC) chip, mounted on a leadframe, has a network of power
distribution lines deposited on the surface of the chip so that these lines are
located over active components of the IC, connected vertically by metal-filled
vias to selected active components below the lines, and also by conductors to segments
of the leadframe.
The network relocates most of the conventional power distribution interconnections
from the circuit level to the newly created surface network, thus saving substantial
amounts of silicon real estate and permitting shrinkage of the IC area.
The network is electrically connected to selected active components by metal-filled
vias; since these vias can easily be redesigned to other locations, IC designers
gain a new degree of design freedom.
The network relocates most of the bond pads dedicated to power supply from the
conventional alignment along the chip periphery onto the newly created bondable
lines, saving substantial additional amounts of silicon real estate, and freeing
the bonding machines from their extremely tight connector placement and attachment
rules to much more relaxed bonding programs.
The network is deposited and patterned in wafer processing as a sequence of metal
layers specifically suited for providing power current and electrical ground potential.
The network has attachable outermost metal surface and is laid out so that network
portions form pads convenient for attaching balls of bonding wires or solder.