Patent ID: 7372301
Filing Date: 2008-05-13
Classification: G06F,H03K,Y02D

Abstract:
1. A bus switch circuit comprising: a switch element which has two terminals connected between first and second terminals and whose electrical connection is controlled when a control signal is input to a control terminal; a first pull-up resistor and first switch circuit connected in series between a power supply voltage terminal and the first terminal; and a second pull-up resistor and second switch circuit connected in series between the power supply voltage terminal and the second terminal, wherein electrical connection of said first switch circuit is controlled upon receiving the control signal, when said switch element is turned on, said first switch circuit is turned on to connect the power supply voltage terminal to the first terminal through said first pull-up resistor, when said switch element is turned off, said first switch circuit is turned off to disconnect the power supply voltage terminal from the first terminal, during a term when said switch element is in an on-state, said first switch circuit is kept on, and electrical connection of said second switch circuit is controlled upon receiving the control signal, when said switch element is turned on, said second switch circuit is turned on to connect the power supply voltage terminal to the second terminal through said second pull-up resistor, when said switch element is turned off, said second switch circuit is turned off to disconnect the power supply voltage terminal from the second terminal during a term when said switch element is in an on-state, said second switch circuit is kept on.