发明授权
US06275089B1 Low voltage controllable transient trigger network for ESD protection
有权
低电压可控瞬态触发网络,用于ESD保护
- 专利标题: Low voltage controllable transient trigger network for ESD protection
- 专利标题(中): 低电压可控瞬态触发网络,用于ESD保护
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申请号: US09482048申请日: 2000-01-13
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公开(公告)号: US06275089B1公开(公告)日: 2001-08-14
- 发明人: Jun Song , Ting Cheong Ang , Shyue Fong Quek , Lap Chan
- 申请人: Jun Song , Ting Cheong Ang , Shyue Fong Quek , Lap Chan
- 主分类号: H03K508
- IPC分类号: H03K508
摘要:
A transient protection circuit is described which provides electrostatic discharge (ESD) protection for an internal circuit of an IC. The transient protection circuit comprises two Zener diodes connected in series between the input pad and the internal circuit of the IC. A sufficiently large ESD pulse will drive one the two Zener diodes into breakdown mode, thereby reducing the magnitude of the ESD pulse to the remainder of the circuit. Resistive means are paralleled with the Zener diodes to provide a signal path at non-ESD voltages. To help shunt the ESD current away from the internal circuit, PMOS and NMOS transistors are connected in parallel between the positive and the negative voltage supply and their junction is connected to the internal circuit. Negative ESD pulses cause the PMOS transistors to turn on, dumping the ESD energy into the positive voltage supply, while positive ESD pulses cause the NMOS transistors to turn on, dumping the ESD energy into the negative voltage supply. Voltage changes, caused by currents flowing through the resistive means, trigger parasitic SCRs into conduction to provide the bulk of the ESD protection.
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