The MAX232 device is a dual driver/receiver that
includes a capacitive voltage generator to supply TIA/EIA-232-F voltage levels from
a single 5V supply. Each receiver converts TIA/EIA-232-F inputs to 5V TTL/CMOS
levels. These receivers have a typical threshold of 1.3 V, a typical hysteresis of
0.5V, and can accept ±30V inputs. Each driver converts TTL/CMOS input levels into
TIA/EIA-232-F levels.