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Battery Back-Up Powered Chip Package

IP.com Disclosure Number: IPCOM000119365D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 2 page(s) / 48K

Publishing Venue

IBM

Related People

Gruber, HW: AUTHOR [+4]

Abstract

Disclosed is the implementation of a battery in a single chip. In the case of power failure, the information on the chip can be saved.

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Battery Back-Up Powered Chip Package

      Disclosed is the implementation of a battery in a single
chip.  In the case of power failure, the information on the chip can
be saved.

      As shown in detail in Fig. 1, a battery is provided in an
elastomeric cushion inside the chip package.  The battery may be
rechargeable.  It supplies back-up power for logic chips in the case
of power failure or stand by power for memory chips in the case of
power off.  The elastomeric cushion is designed to charge the
battery, providing a series resistance to limit the current in the
path from the charging power supply to the battery (circuit diagram
Fig. 2).  The chip comprises an internal switch connecting the
back-up or the stand by battery to the chip power distribution for
logic and memory chips, respectively.

      This implementation has the advantages that
      -    large chips holding complete functions can be protected
against power loss without any particular effort;
      -    only little space is required for packaging the back-up
power source, and
      -    the gas-tight elastomeric material seals the battery to
prevent contamination of the chip package.