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SP3223EBEY Datasheet(PDF) 9 Page - Sipex Corporation |
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SP3223EBEY Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 23 page  9 Date: 10/06/06 SP3223 +3.0V to +5.5V RS-232 Transceivers © Copyright 200 6 Sipex Corporation DESCRIPTION The SP3223 is a 2-driver/2-receiver device ideal for portable or handheld applications. The SP3223 transceivers meet the EIA/TIA-232 and ITU-T V.28/V.24 communication protocols and can be implemented in battery-powered, portable, or handheld applications such as note- book or handheld computers. The SP3223 de- vices feature Sipex's proprietary and patented (U.S.-- 5,306,954) on-board charge pump cir- cuitry that generates ±5.5V RS-232 voltage lev- els from a single +3.0V to +5.5V power supply. The SP3223 devices operate at this typical data rate when fully loaded. The SP3223 series is an ideal choice for power sensitive designs. Featuring AUTO ON-LINE® circuitry, the SP3223 reduces the power supply drain to a 1 µA supply current. In many portable or handheld applications, an RS-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 power saving concerns without major design changes. THEORY OF OPERATION The SP3223 series is made up of four basic circuit blocks: 1. Drivers, 2. Receivers, 3. the Sipex proprietary charge pump, and 4. AUTO ON-LINE® cir- cuitry. Drivers The drivers are inverting level transmitters that convert TTL or CMOS logic levels to 5.0V EIA/ TIA-232 levels with an inverted sense relative to the input logic levels. 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 degradation 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 3K Ω in parallel with 1000pF, (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 (EIA RS-232D 2.1.7, Paragraph 5). The Slew Rate of H and U versions is not limited to enable higher speed data tranfers. The transition of the loaded output from HIGH to LOW also meets the mono- tonicity requirements of the standard. Figure 12 shows a loopback test circuit used to test the RS-232 Drivers. Figure13 shows the test results where one driver was active at 235Kbps and all drivers are loaded with an RS-232 re- ceiver in parallel with a 1000pF capacitor. RS- 232 data transmission rate of 120Kbps to 1Mbps. provide compatibility with designs in personal computer peripherals and LAN applications. Figure 13. Interface Circuitry Controlled by Micropro- cessor Supervisory Circuit UART or Serial µC µP Supervisor IC VIN RESET SP3223 2 4 6 5 3 7 19 GND T 1IN T 2IN C1+ C1- C2+ C2- V+ V- VCC 13 12 0.1µF 0.1µF 0.1µF + C2 C5 C1 + + C3 C4 + + 0.1µF 0.1µF 17 8 RS-232 OUTPUTS RS-232 INPUTS TTL/CMOS INPUTS +3V to +5V 18 SHUTDOWN 20 5KΩ R 1OUT 15 16 5KΩ R 2IN R 2OUT 10 9 TTL/CMOS OUTPUTS EN 1 ONLINE 14 R 1IN T 2OUT T 1OUT 11 STATUS VCC |
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