Patent ID: 9230649
Filing Date: 2016-01-05
CPC Classification: G11C

Claim Text:
1. A 4T2R cell for a non-volatile ternary content-addressable memory, the 4T2R cell comprising: a write transistor, controlled by a write-line, the drain electrode of the write transistor electrically coupled to a bias voltage; a first variable resistive element, electrically coupled to the source of the write transistor; a first transistor, electrically coupled to the first variable resistive element in series, controlled by a first search-line; a second variable resistive element, electrically coupled to the source of the write transistor; a second transistor, electrically coupled to the second variable resistive element in series, controlled by a second search-line, the source electrode of the second transistor and the source electrode of the first transistor being connected together; and a charge control transistor, electrically coupling to a match-line for controlling the voltage level of the match-line, the gate electrode of the charge control transistor electrically coupled to the source of the write transistor, the first variable resistive element and the second variable resistive element; wherein when the 4T2R cell operates in a search phase, a pulse voltage is applied across the gate electrode and the source electrode of the first transistor for determining whether the gate voltage of the charge control transistor changes larger than a match threshold during the period of the pulse, and the pulse voltage is applied across the gate electrode and the source electrode of the second transistor for determining whether the gate voltage of the charge control transistor changes larger than the match threshold during the period of the pulse.