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MAX3232E VIT+ 和VIT- 电压

Other Parts Discussed in Thread: MAX3232E, MAX3232

TI员工好,

1、请问下MAX3232E 规格书中  VIT+ 和VIT- 这两个电压(一个是正向输入门槛电压,一个是反向输入门槛电压)具体指的是什么电压?

2、请问下MAX3232 规格书中 没有看到RIN引脚判断RS232输入高和输入低的电压门槛值,如没有逻辑电压值是否与RS232电气规范一致?