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Hello,
Hi Max,
Thank you for your reply.
I want to know the voltage level that the output port can withstand when an externally unwanted voltage is accidentally input to the DOUT pin.
Is this voltage level the same as the output drive voltage level ?
Regards,
JH
Hi Max,
It's my understanding that the voltage level of RS232 standard is up to ±15V.
So, I think the DOUT pin should be able to withstand from an external source up to ±15V.
I wonder why the DOUT of the TRS3232 is up to ±13.2V.
Thanks in advance.
JH
Hi JH,
An RS-232 transmitter is allowed to have an output voltage as high as +/- 15 V when connected to a standard receiver load. So, receiver ports need to tolerate this voltage. (Actually, they are required to tolerate the maximum open-circuit generator voltage of +/- 25 V). The generator output just needs to be able to withstand open circuits or short circuit faults between it and any other conductor in the cable, though. To my knowledge it is not required for it to withstand +/- 15 V.
Max