| 摘要 |
A high-frequency compatible bidirectional level conversion circuit in which high-voltage port A and low-voltage port B are connected using pass transistor 12, and the side of port A is connected to power supply voltage terminal C using primary and secondary switching circuits 21 and 22 connected in parallel. When port B changes from low level to high level to transmit a level-converted signal from the side of port B to the side of port A, the level at port A rises to turn on primary and secondary switching circuits 21 and 22, and secondary switching circuit 21 turns off after port A has reached the high level. When secondary switching circuit 22 is configured to have a lower impedance than that of primary switching circuit 21, the load capacitance connected to port A is charged by a high current which flows in secondary switching circuit 22 as the level of port A rises. When port B changes from the high level to the low level, secondary switching circuit 22 remains off.
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