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SP3223UCP Datasheet(PDF) 10 Page - Sipex Corporation |
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SP3223UCP Datasheet(HTML) 10 Page - Sipex Corporation |
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10 / 24 page  Date: 5/25/04 SP3223U/3243U +3.0V to +5.5V RS-232 Transceivers © Copyright 2004 Sipex Corporation 10 DESCRIPTION The SP3223U and SP3243U transceivers meet the EIA/TIA-232 and ITU-T V.28/V.24 communication protocols and can be implemented in battery-powered, portable, or hand-held applications such as notebook or palmtop computers. The SP3223U and SP3243U devices 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 SP3223U and SP3243U devices can operate at a data rate of 1000kbps fully loaded. The SP3223U is a 2-driver/2-receiver device, and the SP3243U is a 3-driver/5-receiver device, ideal for portable or hand-held applications. The SP3243U includes one complementary always-active receiver that can monitor an external device (such as a modem) in shutdown. This aids in protecting the UART or serial controller IC by preventing forward biasing of the protection diodes where V CC may be disconnected. The SP3223U and SP3243U series is an ideal choice for power sensitive designs. The SP3223U and SP3243U devices feature AUTO ON-LINE® circuitry which reduces the power supply drain to a 1 µA supply current. In many portable or hand-held 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 SP3223U and SP3243U series is made up of four basic circuit blocks: 1. Drivers 2. Receivers 3. the Sipex proprietary charge pump, and 4. AUTO ON-LINE® circuitry. 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-232-F and all previous RS-232 versions. Unused drivers in- puts should be connected to GND or V CC. The drivers have a minimum data rate of 1000kbps fully loaded with 3k Ω in parallel with 250pF, ensuring compatibility with PC-to-PC communication software. Figure 16. Interface Circuitry Controlled by Micropro- cessor Supervisory Circuit SP3243U 28 24 2 1 27 3 26 5KΩ 5KΩ 5KΩ 5KΩ 5KΩ GND C1+ C1- C2+ C2- V+ V- VCC 14 13 12 20 19 18 17 16 15 0.1µF 0.1µF 0.1µF + C2 C5 C1 + + C3 C4 + + 0.1µF 0.1µF 9 10 11 4 5 6 7 8 RS-232 OUTPUTS RS-232 INPUTS 23 22 21 VCC 25 T 1IN R 1OUT R 1IN T 2OUT R 2OUT T 2IN T 3IN T 3OUT T 1OUT R 2IN R 3IN R 4IN R 5IN R 2OUT R 3OUT R 4OUT R 5OUT ONLINE SHUTDOWN STATUS UART or Serial µC µP Supervisor IC TxD RTS DTR RxD CTS DSR DCD RI VCC VIN RESET |
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