ST75185C Datasheet, PDF (1/22 Pages) STMicroelectronics – Multiple RS-232 drivers and receivers

ST75185C
Multiple RS-232 drivers and receivers
Features
■ Meets and exceeds the requirements of
EIA/TIA-232-E and ITUV.28 standard
■ Single chip with easy interface between UART
and serial port connector of IBM PC/AT^TM and
compatibles
■ Designed to support data rates up to 120 kbps
■ Pinout compatible with ST75C185
Description
The ST75185C contains three drivers and five
receivers. The pinout matches the DB9S
connector design in order 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^TM and compatibles. The
bipolar circuits and processing of the ST75185C
provides a rugged low-cost solution for this
function at the expense of quiescent power and
external passive components relative to the
ST75C185.
The ST75185C complies with the requirements of
the EIA/TIA 232-E and ITU (formally CCITT) v.28
standards. These standards are for data
interchange between a host computer and
peripheral at signalling rates up to 20 k-bits/s. The
switching speeds of the ST75185C are fast
enough to support rates up to 120 K-bits/s with
lower capacitive loads (shorter cables). Inter-
operability at the higher signalling rates cannot be
assured unless the designer has design control of
the cable and the interface circuits at the both
ends. For inter-operability at signalling rates to
120 k-bits/s, use of EIA/ITA-423-B (ITU v.10) and
SO-20
TSSOP20
EIA/ITA-422-B (ITU v.11) standards are
recommended.
The ST75185C is characterized for operation over
the range of 0°C to 70 °C.
Table 1. Device summary
Order codes Temperature range
ST75185CTR
0 to 70 °C
ST75185CDR
0 to 70 °C
Package
TSSOP20 (Tape and reel)
SO-20 (Tape and reel)
Packaging
2500 parts per reel
1000 parts per reel
December 2007
Rev 17
1/22
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