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:
Jul. 09, 2019
Filed:
Jun. 29, 2018
Realtek Semiconductor Corporation, Hsinchu, TW;
Gerchih Chou, San Jose, CA (US);
Li-Jun Gu, Jiangsu Province, CN;
REALTEK SEMICONDUCTOR CORPORATION, Hsinchu, TW;
Abstract
The present invention discloses a DDR4 memory I/O driver including a pre-driver, a pull-up circuit and a pull-down circuit. The pre-driver is coupled between a first high voltage terminal and a low voltage terminal to provide a first and a second pre-driving signals. The pull-up circuit includes: a driving PMOS transistor coupled between a second high voltage terminal and a pull-up resistor, that is coupled to an output pad, to operate according to the first pre-driving signal, in which the second high voltage terminal's voltage is not higher than the first high voltage terminal's voltage. The pull-down circuit includes: a driving NMOS transistor coupled between the low voltage terminal and a cascode NMOS transistor to operate according to the second pre-driving signal; and the cascode NMOS transistor coupled between the driving NMOS transistor and a pull-down resistor, that is coupled to the output pad, to operate according to a bias.