Input circuit and method for protecting the input circuit

Details Input circuit and method for protecting the input circuit Input circuit and method for protecting the input circuit

1997-11-28

2000-05-30

Tokar, Michael

Electronic digital logic circuitry

Interface

Current driving

326 33, 326 34, 326 80, 327389, H03K 190175, H03K 1716

Patent

active

060694939

ABSTRACT:
An input circuit (20) and a method for protecting the input circuit (20) from positive and negative overvoltages. The input circuit (20) includes an N-channel Metal Oxide Semiconductor Field Effect Transistor (MOSFET) (12), a P-channel MOSFET (13), a Zener diode (21), and a diode-connected transistor (22). The P-channel MOSFET (13) protects the N-channel MOSFET (12) from negative overvoltages. The Zener diode (21) and the diode-connected transistor (22) protect the N-channel MOSFET (12) from positive overvoltages. In addition, the Zener diode (21) protects the P-channel MOSFET (13) from positive overvoltages.

REFERENCES:
patent: 3622798 (1971-11-01), Ochi et al.
patent: 4057844 (1977-11-01), Smedley
patent: 4928053 (1990-05-01), Sicard et al.
patent: 5270589 (1993-12-01), Sawada et al.
patent: 5319259 (1994-06-01), Merrill
patent: 5604655 (1997-02-01), Ito
patent: 5751168 (1998-05-01), Speed III et al.

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