公开(公告)号：US09503091B2

公开(公告)日：2016-11-22

申请号：US14084641

申请日：2013-11-20

Applicant: GLOBALFOUNDRIES INC.

Inventor： Toshiaki Kirihata ,  Derek H. Leu ,  Ming Yin

IPC: G11C11/56 ,  G11C16/08 ,  H03K19/0175 ,  G11C16/04 ,  G11C16/12 ,  G06F17/50

CPC classification number: H03K19/017509 ,  G06F17/5045 ,  G06F2217/78 ,  G11C11/5671 ,  G11C16/0466 ,  G11C16/08 ,  G11C16/12 ,  Y02E60/76 ,  Y04S40/22

Abstract: Wordline decoder circuits for an embedded Multi-Time-Read-Only-Memory that includes a plurality of NMOS memory cells coupled to a plurality of wordlines in each row. The wordline decoder circuits control the charge trap behavior of the target NMOS memory array by the mode-dependent wordline high voltage (VWLH) and wordline low voltage (VWLL) trapping the charge in a programming mode by applying an elevated wordline voltage (EWLH) to one of the plurality of WLs, while de-trapping the charge in a reset mode by applying a negative wordline voltage (NWLL) to the entire array. The mode dependent voltage control is realized by switching to couple EWLH to VWLH in a programming mode, otherwise VDD to VWLH, while coupling NWLL to VWLL in a reset mode, otherwise, GND to VWLL. The switch includes plural gated diodes from VWLH with the wordline high protection voltage of VWLH_PR generated by lowering VWLH determined by gated diodes times threshold voltage. The switch includes a series of gated diodes from VWLL with a wordline low protection voltage of VWLL_PR generated by raising VWLL determined by the gated diodes by the threshold voltage, resulting in controlling the WL swing using thin-oxide devices.

Abstract translation: 用于嵌入式多时间只读存储器的字线解码器电路，其包括耦合到每行中的多个字线的多个NMOS存储器单元。 字线解码器电路通过将升高的字线电压（EWLH）施加到编程模式中，通过模式相关字线高电压（VWLH）和字线低电压（VWLL）捕获电荷来控制目标NMOS存储器阵列的电荷陷阱行为 多个WL中的一个，同时通过向整个阵列施加负的字线电压（NWLL）而以复位模式捕获电荷。 通过在编程模式下将EWLH耦合到VWLH来切换模式相关的电压控制，否则将VDD置于VWLH，而在复位模式下将NWLL耦合到VWLL，否则将GND接地VWLL。 该开关包括来自VWLH的多个门控二极管，通过降低由门控二极管确定的VWLH产生的VWLH_PR的字线高保护电压达到阈值电压。 该开关包括一系列来自VWLL的门控二极管，通过将由门控二极管确定的VWLL提高阈值电压而产生的字线低VWLL_PR的保护电压，从而使用薄氧化物器件控制WL摆幅。