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SP3223EUCA-L Datasheet(PDF) 9 Page - Exar Corporation |
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SP3223EUCA-L Datasheet(HTML) 9 Page - Exar Corporation |
9 / 21 page 9 Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (50)668-707 • www.exar.com SP3223E/EB/EU_0_06272 DESCRIPTION The SP3223 is a 2-driver/2-receiver device ideal for portable or handheld applications. The SP3223 transceiversmeettheEIA/TIA- 232 and ITU-T V.28/V.24 communication protocolsandcanbeimplementedinbattery- powered, portable, or handheld applications such as notebook or handheld computers. The SP3223 devices feature Exar's propri- etary on-board charge pump circuitry that generates ±5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. These devices are an ideal choice for power sensitivedesigns.FeaturingAUTOON-LINE® circuitry,the SP3223reducesthepowersup- ply drain to a µA supply current. In many portableorhandheldapplications,anRS-232 cable can be disconnected or a connected peripheral can be turned off. Under these conditions, the internal charge pump and the drivers will be shut down. Otherwise, the system automatically comes online. This feature allows design engineers to address powersavingconcernswithoutmajordesign changes. THEORY OF OPERATION The SP3223 series is made up of four basic circuit blocks: . Drivers, 2. Receivers, 3. The Exar pro- prietary charge pump, and 4. AUTO ON- LINE® circuitry. Drivers The drivers are inverting level transmitters thatconvertTTLorCMOSlogiclevelsto5.0V EIA/TIA-232 levels with an inverted sense relativetotheinputlogiclevels. Typically,the RS-232 output voltage swing is +5.4V with no load and +5V minimum fully loaded. The driver outputs are protected against infinite short-circuits to ground without degrada- tion in reliability. These drivers comply with the EIA-TIA-232F and all previous RS-232 versions. Unused driver inputs should be connected to GND or V CC. The drivers can guarantee output data rates fully loaded with 3kΩ in parallel with 000pF, (SP3223EU, C L= 250pF) ensuring compatibility with PC-to-PC communication software. The slew rate of the driver output on the E and EB versions is internally limited to a maximum of 30V/µs in order to meet the EIA standards(EIARS-232D2..7,Paragraph5). The Slew Rate of EU version is not limited to enable higher speed data transfers. The transition of the loaded output from HIGH to LOW also meets the monotonicity require- ments of the standard. Figure 4 shows a loopback test circuit used to test the RS-232 Drivers. Figure 15 shows the test results where one driver was active at 250kbps and all drivers are loaded with an RS-232 receiver in parallel with a 000pF capacitor. RS-232 data transmission rate of 20kbpsto Mbps providecompatibilitywith designs in personal computer peripherals and LAN applications. Figure 3. Interface Circuitry Controlled by Micropro- cessor Supervisory Circuit SP3223E 2 4 6 5 3 7 19 5KΩ 5KΩ GND C1+ C1- C2+ C2- V+ V- VCC 11 12 15 10 0.1µF + C2 C5 C1 + + C3 C4 + + 17 8 16 9 RS-232 OUTPUTS RS-232 INPUTS 14 20 11 VCC 18 R 1OUT R 1IN T 1OUT T 1IN T 2IN R 2IN R 2OUT ONLINE SHUTDOWN STATUS UART or Serial µC µP Supervisor IC TTL/CMOS INPUTS VCC V IN RESET 0.1µF 0.1µF 0.1µF 0.1µF T 2OUT EN TTL/CMOS OUTPUTS |
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