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请问SN65LBC184同一批次量AB间电压大部分是4.5以上,个别在0.7~1.8之间

Other Parts Discussed in Thread: SN65LBC184

485驱动芯片使用的是SN65LBC184,同一批次,单台上电AB不和其他装置连接,485工作在接收模式,测量输出的AB间电压,大部分在4.5v以上,个别在0.7~1.8左右,更换SN65LBC184后变成4.5v以上,请问是驱动芯片品质问题还是其他的问题,谢谢