TI中文支持网Part Number:SN74AHC32Other Parts Discussed in Thread:SN74AHCT125
SN74AHC32PWR的输出接SN74AHCT125PWR的使能脚，控制SN74AHCT125PWR的通断，SN74AHCT125PWR的是否还要接上拉电阻?
Amy Luo：
您好，
为了确保上电和掉电期间输出高阻态，SN74AHCT125的OE是需要通过上拉电阻连接到VCC的，datasheet有描述“To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.”
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JIAHUA XU：
"SN74AHC32PWR的输出接SN74AHCT125PWR的使能脚",上电和掉电瞬间SN74AHC32PWR输出为高时，SN74AHCT125PWR的使能脚还需要上拉吗？
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Amy Luo：
看下面SN74AHCT125真值表，OE高电平时，其输出高组态，因此是不需要的
