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MAX3237E: MAX3237E DIN high impedance

Part Number: MAX3237E

Hi team,
DIN pin question.

Q1. What is the logic of DOUT when the DIN connection is high impedance?
Q2. Does DIN have internal protection such as resistance?
Q3. Is high impedance guaranteed to work?

Conditions
VCC:3.3V
SHDN:VCC
MBAUD:GND
EN:GND

Regards,
Ken