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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.Please note that this cross reference is based on TOSHIBA's estimate of compatibility with other manufacturers' products, based on other manufacturers' published data, at the time the data was collected.TOSHIBA is not responsible for any incorrect or incomplete information. Information is subject to change at any time without notice.
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掉电保护功能应用示例（局部掉电）
如果使用具有掉电保护功能的IC，则可以实现局部掉电。
为降低功耗，具有两个电压范围（VCC1和VCC2）的系统可以提供局部掉电模式，在该模式下，其中由VCC1运行的子系统将被关闭。例如，假设在电压范围VCC1使用74VHC系列。74VHC系列在输出端和电源之间有一个非预期的寄生二极管。因此，当VCC2>VCC1时，该寄生二极管导通。在这种情况下，IC可能会被产生的大电流破坏。使用既没有输入也没有输出寄生二极管的IC（如74VHCT、74LCX和74VCX系列）可以防止器件损坏。这些系列提供掉电保护。
