SN74AHC32: SN74AHC125PWR的使能脚需要增加上下拉电阻

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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.”