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:
Apr. 07, 2009
Filed:
Nov. 16, 2007
Yoshinori Matsui, Tokyo, JP;
Hitoshi Tanaka, Tokyo, JP;
Kazuhiko Kajigaya, Tokyo, JP;
Akiyoshi Yamamoto, Tokyo, JP;
Tadashi Onodera, Tokyo, JP;
Yoshinori Matsui, Tokyo, JP;
Hitoshi Tanaka, Tokyo, JP;
Kazuhiko Kajigaya, Tokyo, JP;
Akiyoshi Yamamoto, Tokyo, JP;
Tadashi Onodera, Tokyo, JP;
Elpida Memory Inc., Tokyo, JP;
Abstract
A self-refresh timer circuit for generating a timer period for controlling self-refresh operation of a semiconductor memory device comprising: a temperature-dependent voltage source for outputting a voltage having a temperature dependency based on a diode characteristic; a control current generating circuit for applying an output voltage of the temperature-dependent voltage source to a temperature detecting device having a diode characteristic and for generating a control current having a magnitude in proportion to a current flowing through the temperature detecting device; and a timer period generating circuit for generating a timer period in inverse proportion to the magnitude of the control current.