Texas instruments max232 dual eia 232 driverreceivers texas instruments max232d these texas instruments max232d devices are designed to convert between ttl voltage levels 0 to 5v and tiaeia 232 f levels plusmn30v they operate from a single 5vdc power supply with charge pump capacitors for situations where multiple supply voltages are not available such as battery powered or compact systems we also supply a range of eia 232 devices from maxim texas instruments max232d linear ic dual