On implementation of the invention provides a stackable chip-scale package
for improving memory density that may be mounted within a limited area or
module. A novel staggered routing scheme enables the use of the same
trace routing at every level of the stacked architecture for efficiently
accessing individual memory devices in a chip-scale package stack. The
use of a ball grid array chip-scale package architecture in combination
with thermally compatible materials decreases the risk of thermal
cracking while improving heat dissipation. Moreover, this architecture
permits mounting support components, such as capacitors and resistors, on
the chip-scale package.