SN75185

MULTIPLE RS-232 DRIVERS AND RECEIVERS

SLLS181A – DECEMBER 1994 – REVISED NOVEMBER 1998

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POST OFFICE BOX 655303

UART and Serial Port Connector of IBM

PC/AT

™ and Compatibles

Exceed the Requirements of TIA / EIA-232-F

and ITU v.28 Standards

120 kbps

RS-232 Pins and 5 kV on All Other Pins

(Human-Body Model)

description

The SN75185 combines three drivers and five receivers from TI 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 IBM

™ PC/AT™ and compatibles. The bipolar circuits and processing of the SN75185

provides a rugged low-cost solution for this function at the expense of quiescent power and external passive

components relative to the SN75C185.

The SN75185 complies 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 peripheral at signaling rates up to

20 kbit/s. The switching speeds of the SN75185 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 assured unless the

designer has design control of the cable and the interface circuits at both ends. For interoperability at signaling

rates to 120 kbit/s, use of TIA/EIA-423-B (ITU v.10) and TIA/EIA-422-B (ITU v.11) standards are recommended.

The SN75185 is characterized for operation over the temperature range of 0

°C to 70°C.

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RY5

DA3

RY4

DA2

DA1

RY3

RY2

RY1

RA5

DY3

RA4

DY2

DY1

RA3

RA2

RA1

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† This symbol is in accordance with ANSI/IEEE Std 91-1984

and IEC Publication 617-12.

logic diagram (positive logic)

RY1

RA1

RY2

RA2

RY3

RA3

DA1

DY1

DA2

DY2

RY4

RA4

DA3

DY3

RY5

RA5

Copyright

© 1998, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

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RA1

RA2

RA3

DY1

DY2

RA4

DY3

RA5

RY1

RY2

RY3

DA1

DA2

RY4

DA3

RY5

GND

DW OR N PACKAGE

(TOP VIEW)

IBM and PC/AT are trademarks of IBM Corporation.