A common RS-232 transceiver chip for serial communication between devices is the MAX3232ECDBR. It's made to convert TTL/CMOS logic levels to RS-232 levels, making it simple to connect serial interfaces to microcontrollers, computers, and other devices.
The MAX3232ECDBR has a broad operating voltage range of 3.0V to 5.5V and supports data rates up to 120kbps. It is a great option for battery-powered applications because it also has a low-power shutdown mode.