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AM26LV32: 差分输入悬空,TTL输出是高电平怎么解决

Part Number: AM26LV32

两个差分输入之间的R3是100欧姆,不给差分输入时,1A和1B无论是悬空还是通过50欧姆接地,1Y的输出都为高电平3.3V

此时测量1A和1B对地都为0V,1A和1B之间的电压也为0V,3.3V通过50欧姆接G,/G接地,其余3路引脚都是悬空的

为什么此时1Y的输出会是高电平呢