Patent ID: 7352068

Claim:
A multi-chip module, comprising: a first semiconductor chip surface-mounted on a surface of a mounting substrate; a second semiconductor chip mounted back-to-back over the first semiconductor chip, and having a bonding pad in a periphery portion thereof; a first semiconductor memory chip mounted, via a first spacer, over the first semiconductor chip, and having a bonding pad formed in a periphery portion on a surface of the first semiconductor memory chip; a second semiconductor memory chip mounted via a second spacer over the first semiconductor memory chip, and in the same direction as the first semiconductor chip, said second semiconductor chip containing the same circuitry with the same memory capacity as that of the first semiconductor memory chip, wherein the second spacer is mounted over a part of the surface of the first semiconductor memory chip where the bonding pad is not formed; an electrode independently formed on the mounting substrate surface part corresponding to a bonding pad to which a selective signal of the first semiconductor memory chip and the second semiconductor memory chip is supplied; and a plurality of electrodes formed on the mounting substrate surface part in common corresponding to a plurality of bonding pads to which the same signal is respectively supplied except for the selective signal; and wherein die bond films which adhere the first semiconductor memory chip and the second semiconductor memory chip respectively to surfaces of the first spacer and the second spacer are disposed on back surfaces of the first semiconductor memory chip and the second semiconductor memory chip, the back surface of the first semiconductor memory chip and of the second semiconductor memory chip being electrically insulated, wherein a thickness of the first semiconductor memory chip and the second semiconductor memory chip is thickly formed rather than the first semiconductor chip or the second semiconductor chip, and wherein the first semiconductor chip is a semiconductor chip including a microprocessor, the second semiconductor chip is a memory chip which can erase electrically, and records memory information in a nonvolatile memory cell, and the first and second semiconductor memory chips are memory chips which store memory information in a dynamic type memory cell, respectively.