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. 06, 1999
Filed:
Jul. 15, 1997
Hiroshi Shigehara, Oita, JP;
Masanori Kinugasa, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a situation where another analog switching circuit 502 outputs a high potential Vh, this high potential Vh is applied to an output terminal OUT1 of an analog switching circuit 504. When a ground potential is supplied to a node 10 with a changeover switch SW, a diode DD1 falls to an inversely biased state, whereby a potential at a backgate node Nw comes to be approximately equal to the potential Vh. Moreover, a potential approximately equal to the potential Vh is a power source terminal of an NAND gate NAND1, and it is transmitted to an output terminal VGP through an internal circuit, whereby a P channel MOS transistor P1 is turned off. Moreover, the output VGP from an inverter INV5 makes also an N channel MOS transistor N1 turn off. With such a constitution, an unnecessary current is prevented from flowing from a power source potential terminal on a bus line and so on to a ground potential terminal through a parasitic diode, thereby performing full-swinging without lowering an output level.