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SN54LVTH16224

Other Parts Discussed in Thread: SN54LVTH162245

我用的SN54LVTH16224这颗芯片,我想把17脚2B4拉到高电平,供电用的是3.3V,连接方式是17脚串一个300欧姆的电阻,然后上拉至3.3V, 结果测得17脚的电压是3.3V和1.2V变化,而且没什么规律,不知道是为什么,麻烦TI专家帮忙分析一下,谢谢!