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MAX232: Connect T1OUT to T2IN / R1OUT to R2IN to invert signal

Part Number: MAX232
Other Parts Discussed in Thread: SN74LVC2G04

Hi team,

My customer is going to connect T1OUT to T2IN and R1OUT to R2IN to invert the signal.

Could you check it will not cause the damage of device? 

Regards,

Saito

  • As shown in the absolute maximum ratings, the T2IN voltage must not exceed the supply rails.

    You should at least add a series resistor (e.g., 10 kΩ) between T1OUT and T2IN to limit the current to a harmless value. But the datasheet does not specify a limit for that current, so the only proper way to handle inverted signals is to use a single channel and to add inverters (e.g., SN74LVC2G04) on the logic side.

  • Hi Saito,

    I agree with Clemens here. This device cannot support this without modifications to ensure maximum specifications are not violated, specifically on the digital inputs. While this solution is possible, a discrete solution with external inverters would be the my recommended approach. 

    Let us know if you have any more questions.

    Regards,
    Eric Schott