| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an interface circuit in which the internal circuit is protected against a surge when power is turned on, and a leak current can be reduced when power is turned off even when a connected external circuit is turned on. <P>SOLUTION: A transistor 109 for interrupting the leak current is provided between a protection circuit 103 and a power supply (VDD). Furthermore, a transistor 110 for interrupting the leak current is provided between a transistor 102 for driving an external signal I/O terminal to a High level when a High level signal is outputted and the power supply (VDD). A voltage higher than a voltage of the power supply (VDD) is applied to each gate terminal of two leak current interruption transistors by a step-up circuit 111. <P>COPYRIGHT: (C)2007,JPO&INPIT |
