1. A memory device comprising: a data node; a reference node; word lines; a group of non-volatile memory cells serially coupled between the data node and the reference node, the group of non-volatile memory cells coupled to the word lines such that each non-volatile memory cell of the group of non-volatile memory cells is coupled to one of the word lines; and a control circuit operable to apply a same voltage to the word lines during retrieving of data from a selected non-volatile memory cell of the group of non-volatile memory.