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MAX3243E: RIN : High-imp condition

Motoyasu Hattori
Genius 10955 points
Part Number: MAX3243E

Hi,

When FORCEOFF=L, Output is high impedance, but Voltage of Rin pin is reduced.   Is this phenomena "normal behavior"?   Please advise us.

 

Also, are there any method to do high-impedance on Rin pin terminal?

Please advise us.

 

Thanks and best regards,
M.HATTORI.

  • 0
    TI__Guru 52172 points

    Hi M. Hattori,

    How large is the voltage drop on the RIN pin? Why is the customer applying voltage on RIN if the you are shutting off the device ? If you had a schematic snippet that you could share (I understand if you can't) of just the RS-232 bus - i.e what is driving the RIN pins when you force the device off. depending on the RS-232 bus will better determine if what you are seeing is possibly normal or abnormal behavior - please let me know!

    But to answer your question - the RIN pin will never be high impedance - there are pull-down resistors (nominally 5K) on every RIN input. 

    Best,

    Parker Dodson