Patent ID: 7254089
Filing Date: 2007-08-07
Classification: G11C

Abstract:
1. A row decoder for a dynamic random access memory comprising: a twin cell mode predecoder configured to selectively activate one of a first mode selection signal, a second mode selection signal, a third mode selection signal, and a fourth mode selection signal for selectively activating at least one word line of four adjacent word lines driven by a master word line; a first twin cell mode selection circuit configured to be activated in response to the first mode selection signal; a second twin cell mode selection circuit configured to be activated in response to the second mode selection signal; a third twin cell mode selection circuit configured to be activated in response to the third mode selection signal; and a single cell mode selection circuit configured to be activated in response to the fourth mode selection signal, wherein the second twin cell mode selection circuit is configured to activate both a first and fourth word line simultaneously or both a second and third word line simultaneously of the four adjacent word lines driven by the master word line, and wherein the third twin cell mode selection circuit is configured to activate both the first and third word line simultaneously or both the second and fourth word line simultaneously of the four adjacent word lines driven by the master word line.