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Description: The 'must have' IC for TTL/CMOS projects finally has its own breakout board! This is the RS232 converter IC that is capable of running at 3V and communicating with 5V logic.

We've taken the SOIC package MAX3232 and broken out all the pins you need to set up your RS232 to TTL connection. We've also included the necessary 0.1uF charge pump capacitors. Also remember that because the MAX3232 operates at a broader voltage range than the 232 (3 - 5.5V) you can use this on both your 3.3 and 5V projects!


Comments 16 comments

  • Take this and add an SC16IS740/50/60 (an I2C-based UART), or equivalent, on the back and you got a neat little board to add RS232 to an I2C bus.

    • Alright, I’ll try it, but if it doesn’t work you’re going to have to come to my house and fix it! (Thanks for a great suggestion!)

  • Any chance we will ever see a board like this with a DB9 and a MAX3232 on board? Just about every time I use RS232 there is a DB9 connector somewhere, either on the PC or a device.

  • Very Cool! Now, if you could put LEDs on it for status, it would be perfect!

  • Will this work out-of-the-box with an Arduino Due (3.3v) device? I don’t want to end up frying my SAM3X8E….

  • What is the logic level? is it 3v or 5v? Does it change depending on the supply voltage?

  • Am I reading the schematic correctly? Is this, somehow, dual channel? I’m considering making a ‘serial spy’ that listens to both the Rx and Tx lines of a cable, and transmits them out another converter to a computer, so you can see how the devices are communicating. Dual channel (being able to have two Rx lines) would be awesome.

    • Yup, it’s dual channel, so sniffing RX and TX and dumping that into, say, an FTDI Basic board would be a terrific application for this.

  • During normal operation how much current does this chip draws? I’m I reading correct from the datasheet that it only takes 1 microAmp?

  • What are the dimensions of this board?

  • Does this let me put an RS232 input onto my arduino?

    • That’s what I was going to use this board for. I have to run twisted paired signals about 12 feet.

      • Yes. You put Arduino RX to R1IN, Arduino TX to R1OUT, serial devices TX to R1IN, RX to T1OUT. Then add ground and voltage. Hope this helps.

  • This was needed a longgg time ago. Thanks for finally getting around to make it! 3v3 projects will now be able to communicate to the outside world.

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