Patent ID: 7224624
Filing Date: 2007-05-29
Classification: G11C

Abstract:
1. A page buffer for a nonvolatile semiconductor memory device, the page buffer comprising: a loading latch unit adapted to load and store a data bit in a latch node; a unidirectional driver adapted to receive the data bit from the loading latch unit and drive a corresponding write data bit onto a bitline connected to a memory cell, wherein the unidirectional driver is connected between the loading latch unit and the bitline such that during a program operation of the memory cell, the data bit stored in the latch node is prevented from being flipped in response to a voltage level apparent on the bitline; and a sensing detector adapted to flip a logic state of the data bit stored in the latch node according to a voltage level apparent on the bitline, the sensing detector being enabled in response to a read latch signal.