公开(公告)号：US20140167169A1

公开(公告)日：2014-06-19

申请号：US13718713

申请日：2012-12-18

Applicant: MACRONIX INTERNATIONAL CO., LTD.

Inventor： CHIEH WEI HE ,  QI AN XU ,  JUN JUN YU ,  HAN HAO

IPC: H01L27/02

CPC classification number: H01L27/0255

Abstract: An electrostatic discharge (ESD) protection circuit connecting to an input pad is configured to dissipate an ESD current. The circuit has a substrate of a first conductivity type, a first well of a second conductivity type in the substrate, and a second well of the first conductivity type in the first well. The circuit further has a diode device having a first end of the first conductivity type electrically coupled to the input pad and a second end of the second conductivity type in the second well. Moreover, the protection circuit has a first doped region of the second conductivity type in the first well electrically connecting to the input pad, and a second doped region of the first conductivity type in the substrate electrically coupled to the ground. The circuit also has a channel formed between the input pad and the second doped region to provide an ESD current discharge.

Abstract translation: 连接到输入焊盘的静电放电（ESD）保护电路被配置为耗散ESD电流。 电路具有第一导电类型的衬底，衬底中的第二导电类型的第一阱和第一阱中第一导电类型的第二阱。 电路还具有二极管器件，其具有电耦合到输入焊盘的第一导电类型的第一端和第二阱中的第二导电类型的第二端。 此外，保护电路在电连接到输入焊盘的第一阱中具有第二导电类型的第一掺杂区，以及在基板中电耦合到地的第一导电类型的第二掺杂区。 电路还具有形成在输入焊盘和第二掺杂区域之间的通道，以提供ESD电流放电。

公开(公告)号：US20140197450A1

公开(公告)日：2014-07-17

申请号：US13740805

申请日：2013-01-14

Applicant: MACRONIX INTERNATIONAL CO., LTD.

Inventor： CHIEH WEI HE ,  QI AN XU ,  JUN JUN YU ,  HAN HAO

IPC: H01L27/08 ,  H01L23/552 ,  H01L27/088

CPC classification number: H01L27/08 ,  H01L27/0248 ,  H01L27/088 ,  Y10S257/91

Abstract: An electrostatic discharge (ESD) protection circuit is coupled between first and second pads to protect an internal circuit therebetween. Under a normal operating condition, a voltage on the first pad is higher than that on the second pad. The ESD protection circuit includes a substrate of a first conductivity type; first well of a second conductivity type in the substrate, wherein the first well is coupled to the first pad; a snapback device housed in the first well; and a diode string in the substrate, connected in series with the snapback device and separated from the first well, wherein the serially connected diode string and snapback device is connected between the first pad and the second pad. With the isolation from the first well, the holding voltage of the ESD protection circuit can be tuned by adjusting the number of diodes in the diode string without using a guard ring.

Abstract translation: 静电放电（ESD）保护电路耦合在第一和第二焊盘之间以保护它们之间的内部电路。 在正常工作条件下，第一焊盘上的电压高于第二焊盘上的电压。 ESD保护电路包括第一导电类型的衬底; 在衬底中的第二导电类型的第一阱，其中第一阱耦合到第一焊盘; 容纳在第一井中的快速恢复装置; 以及在所述基板中的二极管串，其与所述快速恢复装置串联连接并且与所述第一阱分离，其中所述串联连接的二极管串和快速恢复装置连接在所述第一焊盘和所述第二焊盘之间。 通过与第一个阱的隔离，ESD保护电路的保持电压可以通过调节二极管串中的二极管的数量而不使用保护环来调节。