The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 23, 1999
Filed:
Apr. 22, 1996
Yoshiko Higashide, Hyogo, JP;
Shigeki Ohbayashi, Hyogo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
An input protection circuit device for protecting a device in a semiconductor circuit device when a surge current is applied to a signal input terminal of the semiconductor circuit device is provided. The input circuit device includes an nMOS transistor between an input signal line connecting an input pad and an internal circuit and a first power supply (Vcc), and having a gate electrode connected to GND via a resistor-C, and a diode between the input signal line and GND. When a positive surge current higher than the potential of the first power supply (Vcc) is applied to the input pad, and when a negative surge current lower than the potential of GND is applied, the surge current is moderated by the nMOS transistor and by the diode, respectively, to prevent the flow of the surge current to the internal circuit.