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比较器LM2903DGKR不正常工作问题

Other Parts Discussed in Thread: LM2903, OPA1678

TI的工程师,你好。我最近采用TI的比较器LM2903DGKR(VSSOP-8封装,双通道)做一个简单的电压比较电路。但是发现,比较器在正常供电情况下,对任意一通道,无论正相电压大于还是小于反相,输出均为0。例如某一情况:GND=0,VCC=13V,1IN+=2V,1IN-=1V,1OUT=0。器件采购自贸泽,发现问题后在淘宝采购了一批,情况一模一样,请问这是什么原因呢?