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SP213EEA-L Datasheet(PDF) 5 Page - Exar Corporation |
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SP213EEA-L Datasheet(HTML) 5 Page - Exar Corporation |
5 / 19 page 5 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 50-668-707 • www.exar.com SP207E_00_072309 FEATuRES The SP207E, SP208E, SP211E and SP213E multi–channeltransceiversfitmost RS-232/V.28communicationneeds.Allof thesedevicesfeaturelow–powerCMOScon- struction and ExAR–proprietary on-board charge pump circuitry to generate RS-232 signal-voltages, making them ideal for appli- cations where +9V and -9V supplies are not available.Thehighlyefficientchargepump is optimized to use small and inexpensive 0.µFchargepumpcapacitors,savingboard space and reducing overall circuit cost. Each device provides a different driver/ receiver combination to match standard application requirements. The SP207E is a 5-driver, 3-receiver device, ideal for DCE applications such as modems, printers or other peripherals. SP208Eisa4-driver/4- receiver device, ideal for providing hand- shaking signals in V.35 applications or other general-purpose serial communications. The SP211E and SP213E are each 3-driver, 5-receiver devices ideal for DTE serial ports on a PC or other data-terminal equipment. The SP211E and SP213E feature a low– powershutdownmode,whichreducespower supply drain to µA. The SP213E includes a Wake-Upfunctionwhichkeepstworeceivers activeintheshutdownmode,unlessdisabled by the EN pin. Thefamilyisavailablein28and24pinSO (wide)andSSOP(shrink)smalloutlinepack- ages.Devicescanbespecifiedforcommer- cial(0˚Cto+70˚C)andindustrial/extended (–40˚Cto+85˚C)operatingtemperatures. THEORY OF OPERATION Exar RS-232 transceivers contain three basiccircuitblocks—a)transmitter/driver, b) receiver and c) the ExAR–proprietary charge pump. SP211E and SP213E also include SHUTDOWN and ENABLE func- tions. Transmitter/Drivers The drivers are single-ended inverting trans- mitters,whichaccepteitherTTLorCMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Should the input of the driver be left open, an internal pullup to VCC forces the input high, thus committing the output to a logic- (MARK) state. The slew rate of the transmitter output is internally limited to a maximum of 30V/µs in order to meet the EIA/RS-232andITUV.28standards.The transition of the output from high to low also meets the monotonicity requirements of the standard even when loaded. Driver output voltage swing is ±7V (typical) with no load, and ±5V or greater at maximum load. The transmitter outputs are protected against infinite short–circuits to ground without degradation in reliability. The drivers of the SP211E, and SP213E canbetri–statedbyusingtheSHUTDOWN function. In this “power-off” state the charge pump is turned off and V CC current drops to µA typical. Driver output impedance will remain greater than 300Ω, satisfying the RS-232andV.28specifications.For SP211E SHUTDOWNisactivewhenpin25isdriven high. For SP213ESHUTDOWNisactive when pin 25 is driven low. Receivers The receivers convert RS-232 level input signalstoinvertedTTLlevelsignals.Because signals are often received from a transmis- sion line where long cables and system interference can degrade signal quality, the inputs have enhanced sensitivity to detect weakened signals. The receivers also fea- ture a typical hysteresis margin of 500mV for cleanreceptionofslowlytransitioningsignals in noisy conditions. These enhancements ensure that the receiver is virtually immune to noisy transmission lines. |
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