PROTECTIVE CIRCUIT FOR CMOS IC - MITSUBISHI ELECTRIC CORP

Title:

PROTECTIVE CIRCUIT FOR CMOS IC

Document Type and Number:

Japanese Patent JPH01283957

Kind Code:

A

Abstract:

PURPOSE: To obtain a protector circuit which eliminates a limit resistor from each input terminal of C-MOS IC by connecting a diode between a power terminal and a power line.

CONSTITUTION: A protective circuit has a C-MOS IC 1; a resistor 4 and a capacitor 5 which constitutes a differentiating circuit; a diode 3 which clamps an over input voltage to the C-MOS IC 1; and a diode 10. By this means, when a differential input voltage V11 is changed from OV∼Vcc, an input voltage to the CMOS IC 1 becomes higher than Vcc. However, due to the diode 10, a current from an input terminal to a power terminal through inside of the IC 1 do not flow. Thus, a current limit resistor is unnecessary to each input terminal and circuit protection against over voltage is obtained.

Inventors:

KAWAI JOJI

Application Number:

JP11524688A

Publication Date:

November 15, 1989

Filing Date:

May 11, 1988

Export Citation:

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Assignee:

MITSUBISHI ELECTRIC CORP

International Classes:

H01L21/822; H01L21/8238; H01L27/04; H01L27/08; H01L27/092; H01L29/78; H01L29/866; H03F3/16; H03K19/0948; H03K19/094; (IPC1-7): H01L27/08; H01L27/04; H03F3/16

Attorney, Agent or Firm:

Masuo Oiwa (2 outside)

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