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:
Mar. 03, 2009
Filed:
Nov. 17, 2006
Woo-jin Lee, Seongnam-si, KR;
Hyun-dong Kim, Seoul, KR;
Seong-jin Jang, Seongnam-si, KR;
Abstract
A semiconductor memory device and a method of expanding a valid output data window are described. The semiconductor memory device includes a memory cell array and an output circuit. The memory cell array generates read data having a plurality of bits. The output circuit outputs the read data sequentially in response to a clock signal in a normal mode. On the other hand, the output circuit selectively outputs the bits of the read data by latching bits to be tested among bits of the read data, and by electrically disconnecting bits not to be tested among bits of the read data in response to a plurality of switch control signals in a test mode. Therefore a valid data window of an output data may be expanded.