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Part Number: THVD1452
The datasheet states the the Driver differential output voltage magnitude is typically 3.5V for differential load resistance of 54 Ohm (minimum value) in table 7.7. It would mean the driver output current is 3.5/54 = 65 mA. However, on section 7.4 - Recommended Operating conditions, the maximum Driver output current is 60mA which is smaller than 65mA. Can you confirm whether 60mA or 54 Ohm is correct?
Your calculation is correct. 60mA is kind of a soft line for the driver's operation. In RS-485 standard, only 1.5V Vod over 54Ohm is required. From figure 1 and 2 of 7.9 (page 12) of the datasheet, you can see the driver can provide more current than 60mA with about 20Ohm (2V/100mA) internal impedance.
Please let me know if you have more questions.
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In reply to Hao L:
Thank you for your reply. It's very helpful.
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