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SN74AHC540: CMOS器件闩锁

Part Number: SN74AHC540

如图所示,该芯片用于热插拔时的信号读取及电平转换,单板热插拔时通过MX信号断开和接通GND判断单板是否接入(虚线所示)。但是在热插拔时,单板供电会出现先接入VCC,在接入GND的情况,此时会导致该芯片进入闩锁,芯片发烫甚至损坏。能够解释下芯片进入闩锁的机理,及相关的电流路径。