Any pull high resistor needed on MAX3232?

[maniac84]

Hi guys,
Like the title of this topic, just want to know is there any pull high resistor needed on RX (pin 9) and TX (pin 10) on MAX3232?

 

[faisalengr]

no u dont need any pull up with max3232

 

[maniac84]

Then how bout max3485? Any pull up resistor needed for TX and RX?

 

[tpetar]

**broken link removed**

**broken link removed**

What you have in mind with pull high resistors ?

 

[maniac84]

Just want to know the normal application for max3232 and max3485. Because I saw some design which go pull up resistor on TX and RX.

 

[Faisal Al otari]

Then how bout max3485? Any pull up resistor needed for TX and RX?

Yes, you will need to add 2 * 47K resistors to pull up and put down the data line, and It would be better if you add 2*P6KE6.8 between data lines and GND to protect the ICs, also you should be added 120Ohm as terminator resistor on the end of data line.

 

[maniac84]

Yes, you will need to add 2 * 47K resistors to pull up and put down the data line, and It would be better if you add 2*P6KE6.8 between data lines and GND to protect the ICs, also you should be added 120Ohm as terminator resistor on the end of data line.

Do you have any schematics for that?

 

[Faisal Al otari]

Do you have any schematics for that?

check this schematics

 

[Faisal Al otari]

check this schematics

 

[tpetar]

View attachment 74751
check this schematics

Is there better resolution for this illustration ?

 

[Faisal Al otari]

Is there better resolution for this illustration ?

Ok I will draw more clear one

 

[Faisal Al otari]

Ok I will draw more clear one

Find here clarify circuit