Random access memory including nanotube switching elements. A memory cell
includes first and second nanotube switching elements and an electronic
memory. Each nanotube switching element includes conductive terminals, a
nanotube article and control circuitry capable of controllably form and
unform an electrically conductive channel between the conductive
terminals. The electronic memory is a volatile storage device capable of
storing a logic state in response to electrical stimulus. In certain
embodiment the electronic memory has cross-coupled first and second
inverters in electrical communication with the first and second nanotube
switching elements. The cell can operate as a normal electronic memory,
or can operate in a shadow memory or store mode (e.g., when power is
interrupted) to transfer the electronic memory state to the nanotube
switching elements. The device may later be operated in a recall mode
where the state of the nanotube switching elements may be transferred to
the electronic memory.