数据和时钟线都是集电极开路的。
总线空闲时，两条线都是高电平(集电极开路)。
The bus is "idle" when both lines are high (open-collector).
集电极开路(晶体管)输出负载可容纳高达100毫安的电流。
An open collector (transistor) output accommodates loads up to 100 mA.
如果另外有个电压或电流源存在，用仅有减小电流作用的集电极开路开关代替s1。
If another voltage or current source is present, you could replace S1 with an open-collector switch that sinks current only.
如果另外有个电压或电流源存在，用仅有减小电流作用的集电极开路开关代替s1。
If another voltage or current source is present, you could replace S1 with an open-collector switch that sinks current only.
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