发明名称 |
ESD protection circuits using Zener diodes |
摘要 |
An electrostatic discharge protection circuit 11 coupled between an input pad 12 and operational circuitry 20 includes a primary clamp circuit 14 coupled to input pad 12, and a current limit circuit 16 coupled to primary clamp circuit 14. Primary clamp circuit 14 clamps an electrostatic discharge voltage to a first voltage value. Operational circuitry 20, susceptible to damage due to an electrostatic discharge, is coupled to current limit circuit 16 and a zener diode 30 is coupled between current limit circuit 16 and a ground potential. Zener diode 30 has a cathode terminal coupled to current limit circuit 16 and an anode terminal coupled to ground potential. Zener diode 30 further clamps a voltage across operational circuitry 20 to a second voltage which is less than 10 V, thereby protecting operational circuitry 20 from damage due to electrostatic discharge.
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申请公布号 |
US5500546(A) |
申请公布日期 |
1996.03.19 |
申请号 |
US19940308005 |
申请日期 |
1994.09.16 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
MARUM, STEVEN E.;KRAUS, KARL-HEINZ |
分类号 |
H01L27/02;(IPC1-7):H01L23/62;H02H9/00 |
主分类号 |
H01L27/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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