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SN74GTL2003: 3.3V和1.8V 电平转换

Part Number: SN74GTL2003

用该芯片进行3.3V转1.8v的电平转换,1.8V的电压被抬高到2.6V,只要GREF和DREF提供3.3V,SREF就是2.6V,不是提供的1.8V,这个是什么原因?