Scalable two transistor memory device

摘要

A Scalable Two-Transistor Memory (STTM) cell array having a 4F2 unit cell area, where F is the minimum feature size. The data lines and the bit lines alternate and are adjacent to each other along the Y-axis direction, and the word lines are laid out along the X-axis direction. Each STTM cell consists of a floating gate MOS sensing transistor at the surface of a semiconductor substrate, with a vertical double sidewall gate multiple tunnel junction barrier programming MOS transistor on top of the sensing transistor. A data line connects all source regions of the programming transistors and a bit line connects all the source/drain regions of the sensing transistors in a column direction. A word line connects all double sidewall gate regions of programming transistors in a row direction. This invention also deals with a column addressing circuit as well as the driving method for the circuit.