5-V multichannel 120kbps RS-232 line driver/receiver with +/-7.5V output & +/-1.5-kV ESD protection

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 20kbits. The switching speeds of

these devices are fast enough to support rates up to 120kbits 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 120kbits, use

of TIA/EIA-423-B (ITU V.10) and TIA/EIA-422-B (ITU V.11) standards is recommended.