| 摘要 |
<p>PURPOSE:To reduce through current in the transition even if one power source lowers in a device where first and second power sources, etc., and plural power sources exist by fixing an output signal to a low level or performing the fixed input of the signal regardless of the level of an input signal when first power source potential. is lowered. CONSTITUTION:In a mode where a first power source lowers, a signal 7 is provided within an output I/F 4a and a first power source system element group 2, passes the gate 8 connected with the first power source and becomes the output signal 5a of the first power source system element group 2. At this stage, the number of the stage of element is adjusted so that the state of the output signal 5a to be the output may enter a second power source system element group 3 at a low level. Thus, because the state of the output signal 5a is the low level, the state of the output signal 5a remains as the low level state even if the potential of the first power source changes and through current does not generate within the second power source system element group 3. Therefore, the second power source potential does not lower.</p> |
