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SN65176B: 接口处理方式

Part Number: SN65176B

SN65176BDR TI专家 你好 我想请问下 这个芯片1脚(RO)内部电路是怎么处理的,5V-VCC供电 ,但在RO脚输出上拉了3.3V,输出高电平时是5V  还是3.3V ?