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SN74LVC8T245转换速率和输入电流

Other Parts Discussed in Thread: SN74LVC8T245

请问一下电平转换芯片的转换速率怎么算,手册上给了Δt/Δv和 Tphl  Tplh,这两种数据跟转换速率有什么关系。

还有就是这款芯片有输入电流限制吗,要加限流电阻吗。