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SN74LVC1T45: SN74LVC1T45上电后的B端口和VCCB的电阻很小是什么问题

Part Number: SN74LVC1T45

 如图连接,上电后B端口和VCCB之间电阻很小,10Ω只有,断电后电阻很大,这是正常的吗