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UC5180CQ Datasheet(PDF) 3 Page - Texas Instruments |
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UC5180CQ Datasheet(HTML) 3 Page - Texas Instruments |
3 / 6 page UC5180C APPLICATIONS INFORMATION Failsafe Operation These devices provide a failsafe operating mode to guard against input fault conditions as defined in EIA422A and EIA423A standards. These fault condi- tions are (1) drive in power-off condition, (2) receiver not interconnected with driver, (3) open-circuited intercon- necting cable, and (4) short-circuited interconnecting cable. If one of these four fault conditions occurs at the inputs of a receiver, then the output of that receiver is driven to a known logic level. The receiver is pro- grammed by connecting the failsafe input to VCC or ground. A connection to VCC provides a logic "1" output under fault conditions, while a connection to ground provides a logic "0". There are two failsafe pins (FS1 and FS2) on the UC5180C where each provides com- mon failsafe control for four receivers. Input Filtering (UC5180C) The UC5180C has input filtering for additional noise re- jection. This filtering is a function of both signal level and frequency. For the specified input (5.5 MHz at ±500 mV) the input stage filter attenuates the signal such that the output stage threshold levels are not exceeded and no change of state occurs at the output. EIA232E/V.28 / EIA423A/V.10 DATA TRANSMISSION EIA422A/V.11 DATA TRANSMISSION UNITRODE INTEGRATED CIRCUITS 7 CONTINENTAL BLVD. •• MERRIMACK, NH 03054 TEL. (603) 424-2410 •• FAX (603) 424-3410 Figure 2. AC Test Circuit 3 |
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