描述
晶体管输出型接口电路中，当输出锁存器的对应位为“1”时，其对应的晶体管导通，把负载和电源连通起来，使得负载获得电流，发光二极管（LED）导通；当输出锁存器的对应为“0”时，其对应的晶体管截止，把负载和电源隔断，使得负载不会获得电流，发光二极管（LED）不导通。
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