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ST75185CDR
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™ and compatibles ■ Designed to support data rates up to 120 kbps ■ Pinout compatible with ST75C185 SO-20 TSSOP20 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™ 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. 120 k-bits/s, use of EIA/ITA-423-B (ITU v.10) and 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. 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). Interoperability 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 Table 1. Device summary Order codes Temperature range Packages Packaging ST75185CTR 0 to 70 °C TSSOP20 (tape and reel) 2500 parts per reel ST75185CDR 0 to 70 °C SO-20 (tape and reel) 1000 parts per reel April 2009 Doc ID 6228 Rev 18 1/22 www.st.com 22
STM
STMicroelectronics NV
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