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SP3243EBET Datasheet(PDF) 10 Page - Sipex Corporation |
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SP3243EBET Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 25 page Date: 6/2/04 SP3223EB/3243EB +3.0V to +5.5V RS-232 Transceivers © Copyright 2004 Sipex Corporation 10 DESCRIPTION The SP3223EB and SP3243EB transceivers meet the EIA/TIA-232 and ITU-T V.28/V.24 com- munication protocols and can be implemented in battery-powered, portable, or hand-held ap- plications such as notebook or palmtop comput- ers. The SP3223EB and SP3243EB 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 SP3223EB and SP3243EB devices can operate at a data rate of 250kbps fully loaded. The SP3223EB is a 2-driver/2-receiver device, and the SP3243EB is a 3-driver/5-receiver de- vice ideal for portable or hand-held applications. The SP3243EB 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 VCC may be disconnected. The SP3223EB and SP3243EB series is an ideal choice for power sensitive designs. The SP3223EB and SP3243EB 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 SP3223EB and SP3243EB 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-232F and all previous RS-232 versions. Unused driver inputs should be connected to GND or VCC. The drivers can guarantee a data rate of 250kbps fully loaded with 3k Ω in parallel with 1000pF, ensuring compatibility with PC-to-PC commu- nication software. The slew rate of the driver output 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 transition of the loaded output from HIGH to LOW also meets the monotonicity requirements of the standard. Figure 16. Interface Circuitry Controlled by Micropro- cessor Supervisory Circuit SP3243EB 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 C P Supervisor IC TxD RTS DTR RxD CTS DSR DCD RI VCC VIN RESET |
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