• 2021-04-14
    为了使74HC138正常工作,使能输入端、和的电平应是。http://img-ph-mirror.nosdn.127.net/LtHJYHSD1ADEkZwb6GT2Yw==/6630088100839568019.pnghttp://img-ph-mirror.nosdn.127.net/JHZfDTHODBmsPqSTcITJOw==/6632133192469973494.pnghttp://img-ph-mirror.nosdn.127.net/Ez3wc5LaCanO_ETc6TP7vg==/6631977061818835688.png