SN75185
MULTIPLE RS-232 DRIVERS AND RECEIVERS
SLLS181A – DECEMBER 1994 – REVISED NOVEMBER 1998
DW OR N PACKAGE
(TOP VIEW)
Single Chip With Easy Interface Between
UART and Serial Port Connector of IBM
PC/AT and Compatibles
V
V
CC
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5
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10
20
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DD
Three Drivers and Five Receivers Meet or
Exceed the Requirements of TIA/EIA-232-F
and ITU v.28 Standards
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
RY1
RY2
RY3
DA1
DA2
RY4
Designed to Support Data Rates Up To
120 kbps
ESD Protection Meets or Exceeds 10 kV on
RS-232 Pins and 5 kV on All Other Pins
(Human-Body Model)
13 DA3
12 RY5
11
V
GND
Pinout Compatible With the SN75C185
SS
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.
†
logic symbol
logic diagram (positive logic)
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RA1
RA2
RY1
RA1
RA2
RA3
DY1
DY2
RA4
DY3
RA5
RY1
RY2
RY3
DA1
DA2
RY4
DA3
RY5
RY2
RA3
DY1
RY3
DA1
DY2
RA4
DY3
RA5
DA2
RY4
DA3
RY5
†
This symbol is in accordance with ANSI/IEEE Std 91-1984
and IEC Publication 617-12.
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.
IBM and PC/AT are trademarks of IBM Corporation.
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.
1
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