| 摘要 |
A voltage selective circuit of a power source having a first voltage and a second voltage of the present invention includes a selective switch module, a high voltage bias module, a level shift module and a high voltage selective module. The selective switch module includes two first transistors. A power supply is selected from either the first voltage or the second voltage to output to integrated circuits. The high voltage bias module selects a higher voltage from the power supply and the power source of the first/second voltage to output to wells of the two first transistors. The level shift module includes two level shifters. The high voltage selective module selects a higher voltage from the first voltage and the second voltage as internal power to supply to the level shift module.
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