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SN65EPT21: Definition of VIH, VIL, VIHCMR and VPP

Part Number: SN65EPT21

Hi Team, 

My customer have following questions about SN65EPT21. Could you kindly help? Thanks.

1. Definition of VIH and VIL. Does it mean if D and D bar pin have input signal ranging 2075mV~2420mV, it will be seen HIGH inside IC. And if input signal ranging 1355mV~1675mV, it will be seen LOW inside IC?

2. If 1. is correct, when VCC is fixed, what will output be when D and D bar pin have input signal ranging 0~1354mV or 2421~3300mV?

3. What is VIHCMR? I couldn't understand it from datasheet. 

4. What is VPP? I couldn't understand it from datasheet.

Thanks.

Regards,

Jo