US Patent 7787303 Programmable CSONOS logic element

A complementary SONOS-type (CSONOS) logic device is programmed and erased with a common voltage. The programming method involves reading the logic state of a complementary pair without disturbing the logic state after setting the complementary pair of non-volatile trapped-charge memory devices, including a first memory device and a second memory device, to a first logic state or a second logic state with a common voltage to control the complementary pair. The CSONOS device retains data integrity over extended read endurance cycles.