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The information presented in this cross reference is based on TOSHIBA's selection criteria and should be treated as a suggestion only. Please carefully review the latest versions of all relevant information on the TOSHIBA products, including without limitation data sheets and validate all operating parameters of the TOSHIBA products to ensure that the suggested TOSHIBA products are truly compatible with your design and application.
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为何需要电平转换器？
如果连接不同电平信号的I/O，驱动IC的输出电压电平可能不满足接收器的输入电压规格，从而导致接收器故障或损坏。使用电平转换器能很方便地解决此类问题。
如果各个器件之间的电压不匹配，可能会出现何种异常现象？这里有两个示例：
第一个示例是将某个信号从高电压电平输入至低电压电平的器件，如右上图所示。低压侧的器件输入电路的耐压通常较低，如果输入高于耐压的电压，该器件可能会遭损毁。
第二个示例是将某个信号从低电压电平输入至高电压电平的器件，如左下图所示。如果在高压侧的器件上施加接近输入阈值的电压，则无法识别高电平信号，从而导致故障。
此时，需通过电平转换器来解决这些问题。
请参阅常见问题（FAQ）“应用示例（5V⇔3.3V）”。
该怎么做才能实现5V到3.3V的电平转换？反之亦然