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:
Aug. 21, 2007
Filed:
Jan. 06, 2003
Shunsuke Toyoshima, Higashimurayama, JP;
Yasuhiro Fujimura, Hamura, JP;
Toshiro Takahashi, Hamura, JP;
Shunsuke Toyoshima, Higashimurayama, JP;
Yasuhiro Fujimura, Hamura, JP;
Toshiro Takahashi, Hamura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
The invention provides a technique that enables a correct discrimination of reception data, when the supply voltage of a semiconductor integrated circuit having a simultaneous bi-directional interface is decreased. The data transmission system is provided with input circuits constituting a simultaneous bi-directional interface by the number of reference voltages used. Each of the input circuits is supplied with a fixed reference voltage, the input circuit supplied with a higher reference voltage employs a differential amplifier with n-channel MOSFETs served as input differential devices, and the input circuit supplied with a lower reference voltage employs a differential amplifier with p-channel MOSFETs served as input differential devices, in which selectors switch the outputs of the two differential amplifiers in correspondence with the output data of their own. Thus, the system attains the reception data.