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. 01, 1996
Filed:
Dec. 30, 1994
Seung-Kweon Yang, Seoul, KR;
Lee Patent & Trademark Office, Suwon, KR;
Abstract
The present invention relates to an input buffer used in semiconductor memory devices and more particularly to an input buffer capable of operating at a high speed by using a BiCMOS (bi-complementary metal oxide semiconductor) circuit. In accordance with the present invention, there is provided an input buffer using a pull-up bipolar transistor and a pull-down bipolar transistor at an output side thereof, including a first device connected between an output terminal of the input buffer and a base of the pull-down bipolar transistor, for charging the base of the pull-down bipolar transistor to a predetermined first level, when potential of an external input signal is changed from a first state to a second state; and a second device connected between the output terminal of the input buffer and the base of the pull-down bipolar transistor, for charging the base of the pull-down bipolar transistor to a predetermined second level, after the potential of the external input signal is changed from a first state to a second state and the first device is at least activated.