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SP238ACS Datasheet(PDF) 6 Page - Sipex Corporation |
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SP238ACS Datasheet(HTML) 6 Page - Sipex Corporation |
6 / 17 page Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers © Copyright 2004 Sipex Corporation 6 FEATURES… Themulti–channelRS-232linedrivers/receiverspro- videsavarietyofconfigurationstofitmostcommuni- cation needs, especially those applications where ±12V is not available. The SP230A, SP235A/B, SP236A/B, SP240A/B, and SP241A/B feature a shutdownmodewhichreducesdevicepowerdissipa- tion to less than 5 µW. All feature low power CMOS operation, which is particularly beneficial in battery- powered systems. The SP235A/B use no external components and are ideally suited where printed circuit board space is limited. All products in the Series include two charge pump voltage converters which allow them to operate from a single +5V supply. These converters convert the +5V input power to the ±10V needed to generate the RS-232 output levels. An internal charge pump converter produces the necessary –12V supply. All drivers and receivers meet all EIA RS-232D and CCITT V.28 specifications. The Series are available for use over the commer- cial, industrial and military temperature ranges. They are packaged in plastic DIP and SOIC packages. For product processed and screened to MIL–M–38510 and MIL–STD–883C require- ments, please consult the factory. THEORY OF OPERATION The SP230A/B–241A/B series devices are made up ofthreebasiccircuitblocks–1)transmitter,2)receiver and 3) charge pump. Each model within the series incorporates variations of these circuits to achieve the desired configuration and performance. Driver/Transmitter The drivers are inverting transmitters, which accept TTL or CMOS inputs and output the RS-232 signals withaninvertedsenserelativetotheinputlogiclevels. Typically the RS-232 output voltage swing is ±9V. Evenunderworst-caseloadingconditionsof3k Ωand 2500pF, the output is guaranteed to be ±5V, which is consistent with the RS-232 standard specifications. The transmitter outputs are protected against infi- nite short-circuits to ground without degradation in reliability. The drivers of the SP230A, SP235A/B, SP236A/B, SP240A/B and SP241A/B can be tri-stated by using theSHUTDOWNfunction.Inthis“power-off”state, the output impedance will remain greater than 300 Ohms, again satisfying the RS-232 specifications. Should the input of the driver be left open, an internal 400k Ω pull–up resistor to V CC forces the input high, thus committing the output to a low state. The slew rate of the transmitter output is internally limited to a maximum of 30V/ µs in order to meet the Table 1. EIA Standards Definition 20kbps 100kbps 10Mbps 10Mbps 64kbps |
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