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:
Nov. 02, 2021
Filed:
Sep. 19, 2019
Infineon Technologies Ag, Neubiberg, DE;
Infineon Technologies AG, Neubiberg, DE;
Abstract
A circuit to protect a digital input and output (I/O) terminal from an overvoltage applied externally to the digital I/O terminal. The circuit is arranged similar to a bootstrap switch such that a pass-device protects an output driver from an overvoltage applied to the digital I/O terminal and the output driver controls the operation of the pass-device, such as an N-channel metal-oxide semiconductor (NMOS) transistor. The circuit may include a capacitor and a diode coupled to the gate of the NMOS transistor. A digital zero from the output driver charges the capacitor. A digital one from the output driver causes the charged capacitor, coupled between source and the gate of the NMOS transistor, provides sufficient gate-source voltage to pass the digital one from the driver to the digital I/O terminal. The circuit further includes refresh circuitry configured to maintains the gate source voltage on the capacitor.