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指的是内部架构，forward/reverse通道数目，比如ISO7240C，即为4/0，指的是同向四个通道，反向通道是0. 或者您看下ISO7240和ISO7241的架构图，一目了然：
数据手册中没有任何的明确说明，这难道要靠猜测，查看内部结构也无法明确知道具体含义，总之数据手册写的非常不好！！！
datasheet中一般会有说明的哈，以ISO724x为例，在Page1就有这样描述：
The ISO7240x family of devices has all four channels in the same direction.
The ISO7241x family of devices has three channels in the same direction and one channel in the opposition direction.
The ISO7242x family of devices has two channels in each direction.
指的是内部架构，forward/reverse通道数目，比如ISO7240C，即为4/0，指的是同向四个通道，反向通道是0. 或者您看下ISO7240和ISO7241的架构图，一目了然：
