Output rise and fall times are TTL compatible and independent of pulse duration.

输出上升和下降时间ttl兼容和脉冲持续时间无关。

youdao

The port provides both output and input channels, which are generally TTL compatible.

该端口提供输出和输入通道，一般为TTL兼容。

youdao

The inputs are TTL compatible and outputs are similar to totem pole TTL outputs, with active pull-up and pull-down.

其输入与ttl兼容，输出类似于图腾柱ttl输出，具有有效的上拉和下拉。

youdao