Circuit for electrostatic discharge protection
    1.
    发明授权
    Circuit for electrostatic discharge protection 有权
    静电放电保护电路

    公开(公告)号:US5946177A

    公开(公告)日:1999-08-31

    申请号:US134943

    申请日:1998-08-17

    IPC分类号: H01L27/02 H02H9/00

    CPC分类号: H01L27/0248

    摘要: A circuit (100) ensures electrostatic discharge (ESD) protection during an ESD event. The ESD circuit (100) has a current shunting device (135), a RC trigger circuit (125) and a RC delay circuit (130). The shunting device (135) is connected between two IC power supply rails, and provides the primary current path for a positive ESD event referenced from one power supply rail (V.sub.DD 105) to the other (V.sub.ss 110). The trigger circuit (125) initially activates the shunting device into a low resistance conductive state in response to an ESD event. The RC delay circuit (130) serves to maintain the shunting device in the conductive state, initially produced by the trigger circuit (125), for the remaining duration of the ESD event. A large capacitor required to achieve the delay time in this RC circuit may be eliminated by utilizing the gate-to-body capacitance in the existing shunting device (135).

    摘要翻译: 电路(100)在ESD事件期间确保静电放电(ESD)保护。 ESD电路(100)具有电流分流装置(135),RC触发电路(125)和RC延迟电路(130)。 分流装置(135)连接在两个IC电源轨之间,并为从一个电源轨(VDD105)到另一个(Vss 110)所参考的正ESD事件提供初级电流路径。 响应于ESD事件,触发电路(125)首先将分流装置激活成低电阻导通状态。 RC延迟电路(130)用于在ESD事件的剩余持续时间内将分流装置维持在初始由触发电路(125)产生的导通状态。 通过利用现有的分流装置(135)中的门到体电容,可以消除在该RC电路中实现延迟时间所需的大电容器。