Hi Experts,
For RS232, with 921600 data rate, what's the maximum cable length that MAX3237E can support? Thanks.
Arie
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Hi Arie,
It depends on the capacitance per unit length of the cable. Typically the "length" parameter of RS-232 is defined by the cables unit capacitance.
Our device can drive a 1000pF capacitive load in parallel with a 3K Ohm load (where the loading is cable capacitance in parallel with input impedance of receiver) at 1Mbps when MBAUD is set to VCC. For your application the 1Mbps spec is the one you should look to - as a data rate of 921.6kbps is extremely close, and from a frequency perspective the difference between 921.6kbps and 1Mbps would be small in terms of distance gained - so I'd still use the 1000pF mark.
So depending on the cable parameters will determine the max length you should design for in the device. So, for example, if your cable / transmission line is 50pF/m than you could get 20m of length with this device.
Please let me know if you have any other questions!
Best,
Parker Dodson