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dsp无法断电

采用6748,使用UPP与一个并口的ADC相连,ADC为12bit,ADC的数据口直接连接到了dsp的UPP通道上,当切断DSP的所有电源后,ADC正常供电,在这种情况下DSP无法完全切断电源,电源引脚上依然有电压,请问这种情况是通过ADC的引脚反灌到了电源端吗?DSP的这些引脚有钳位二极管吗?

DSP的其余引脚都是普通IO使用。