3 ms·I'd be surprised if any modern board didn't use something like a MAX232 or something similar thoughby bogantech 4y agoI'd be surprised if any modern board didn't use something like a MAX232 or something similar thoughtyingq 4y agoThe context being that a MAX232 only needs +5vcc, right? Edit: Apparently called 'Integrated charge pumps'bloggie 4y agoYes, there are low current requirements, so typical uart to rs232 transceiver ICs include the electronics necessary to provide the higher voltage +- supplies.