Various embodiments are directed to an apparatus comprising a
semiconductor memory array with non-volatile memory unit cells arranged
into a NAND block. Each of the unit cells comprises a resistive sense
element connected in parallel with a switching element. The resistive
sense elements are connected in series to form a first serial path, and
the switching elements are connected in series to form a second serial
path parallel to the first serial path. Each resistive sense element is
serially connected to an adjacent resistive sense element in the block by
a tortuous conductive path having a portion that extends substantially
vertically between said elements to provide operational isolation
therefor.