Is that possible to work MAX232 for 2 different voltages?

[Shivanand P]

I mean to say that, I wanted to use transmission with 3.3V and my reception is with 5V can i use a 3.3v transmission for that receiver using MAX232?

 

[alexan_e]

When MAX232 is connected to 5v supply then

VIL Low-level input voltage (T1IN, T2IN) 0.8v
VIH High-level input voltage (T1IN,T2IN) 2v

so it will work fine, you can send 3.3v signals and receive 5v signals (I assume your mcu is 5v tolerant)

 

[not-a-moderator]

You can also have a look at this doc that explains the TTL/CMOS thresholds:

**broken link removed**

 

[Shivanand P]

Thanks for your valuable reply..