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:
Oct. 14, 2025
Filed:
Oct. 10, 2023
SK Keyfoundry Inc., Cheongju-si, KR;
Wanchul Kong, Gwangju-si, KR;
Jungho Kim, Seoul, KR;
SK keyfoundry Inc., Cheongju-si, KR;
Abstract
A bidirectional I/O circuit includes an output post driver configured to control an output signal of a bidirectional pad during a normal mode, a floating N-well network configured to apply a VDD-level bias to the output post driver based on an input signal of the bidirectional pad during a power down mode, and a post driver control circuit configured to set an input voltage level of the output post driver to a VDD level during the power down mode to prevent a leakage current path from being formed through the output post driver. A parasitic diode is formed between the drain of the first PMOS transistor and an N-well of the first PMOS transistor. The N-well of the first PMOS transistor is connected to the floating N-well network, and the source and the N-well of the first PMOS transistor are not physically connected to each other.