A flash memory cell in the form of a transistor capable of storing
multi-bit binary data is disclosed. A pair of floating gates are provided
beneath a control gate. The control gate is connected to a word line while
active doped regions (source and drain regions) are connected to
respective digit lines. The floating gates are separately charged and read
out by controlling voltages applied to the word line and digit lines. The
read out charges are decoded into a multi-bit binary value. One or both of
the floating gates has a side insulator which connects through a conductor
to an associated active doped region thereby forming a capacitor across
the side insulator between the floating gate. This capacitor and active
region facilitates operation of the transistor as a flash memory cell.
Methods of fabricating the memory cell and operating it are also
disclosed.