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SP3243EU Datasheet(PDF) 10 Page - Sipex Corporation |
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SP3243EU Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 25 page Date: 06/28/04 SP3223EU/3243EU +3.0V to +5.5V RS-232 Transceivers © Copyright 2004 Sipex Corporation 10 DESCRIPTION The SP3223EU and SP3243EU 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 SP3223EU and SP3243EU devices feature Sipex's proprietary and patented (U.S.-- 5,306,954) on-board charge pump circuitry that generates ±5.5V RS-232 voltage levels from a single +3.0V to +5.5V power supply. The SP3223EU and SP3243EU devices can operate at a data rate of 1000kbps fully loaded. The SP3223EU is a 2-driver/2-receiver device, and the SP3243EU is a 3-driver/5-receiver device, ideal for portable or hand-held applications. The SP3243EU 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 SP3223EU and SP3243EU series is an ideal choice for power sensitive designs. The SP3223EU and SP3243EU 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 condi- tions, the internal charge pump and the drivers will be shut down. Otherwise, the system auto- matically comes online. This feature allows de- sign engineers to address power saving concerns without major design changes. THEORY OF OPERATION The SP3223EU and SP3243EU 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 SP3243EU 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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