Patent ID: 7425860
Filing Date: 2008-09-16
Classification: H03K

Abstract:
1. A level converting circuit for converting a signal level of a first logic circuit to which a first power source is supplied into a signal level of a second logic circuit to which a second power source is supplied, comprising: a pull-up and/or pull-down circuit, which is connected to a level conversion output of a level conversion core circuit, in which the second power source is supplied to the level conversion output of the level conversion core circuit, a control circuit to which the second power source is supplied and which receives as inputs thereto a level conversion input signal and the level conversion output signal, and a switching circuit which is disposed between a ground power source terminal of the level conversion core circuit and a ground power source and which is controlled by a third logic circuit to which the second power source is supplied, the third logic circuit generating a first control signal under control of the first power source, wherein the control circuit is controlled by a second control signal from the third logic circuit.