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SN74LVC16T245: 电流和应用

Part Number: SN74LVC16T245

应用是将一路TTL信号输入以提高信号的电流驱动能力,问题是:

1、实际工作时,Vcc的电流是多大

2、实际使用是DIR接地,B端输入A端输出,如果不用的管脚请问是接地还是悬空?