The GD65232 and GD75232 combine three drivers and five receivers from the Texas Instruments
trade-standard SN75188 and SN75189 bipolar quadruple drivers and receivers, respectively. The pinout
matches the flow-through design of the SN75C185 to decrease the part count, reduce the board space required,
and allow easy interconnection of the UART and serial-port connector of an IBM? PC/AT and compatibles. The
bipolar circuits and processing of the GD65232 and GD75232 provide a rugged, low-cost solution for this
function at the expense of quiescent power and external passive components relative to the SN75C185.
The GD65232 and GD75232 comply with the requirements of the TIA/EIA-232-F and ITU (formerly CCITT) V.28
standards. These standards are for data interchange between a host computer and a peripheral at signaling
rates up to 20 kbit/s. The switching speeds of these devices are fast enough to support rates up to 120 kbit/s
with lower capacitive loads (shorter cables). Interoperability at the higher signaling rates cannot be expected
unless the designer has design control of the cable and the interface circuits at both ends. For interoperability
at signaling rates up to 120 kbit/s, use of ANSI TIA/EIA-423-B (ITU V.10) and TIA/EIA-422-B (ITU V.11) standards is recommended.