| US 7,372,301 B2 | ||
| Bus switch circuit and interactive level shifter | ||
| Masato Fukuoka, Kanagawa (Japan); and Fumio Sashihara, Oita (Japan) | ||
| Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan) | ||
| Filed on Jul. 19, 2002, as Appl. No. 10/198,463. | ||
| Claims priority of application No. 2001-219975 (JP), filed on Jul. 19, 2001; and application No. 2001-220033 (JP), filed on Jul. 19, 2001. | ||
| Prior Publication US 2004/0052249 A1, Mar. 18, 2004 | ||
| Int. Cl. H03K 19/0175 (2006.01) | ||
| U.S. Cl. 326—81 [326/86; 326/31; 326/68; 327/437] | 12 Claims |
| 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.
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