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SP3223E Datasheet(PDF) 10 Page - Sipex Corporation |
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SP3223E Datasheet(HTML) 10 Page - Sipex Corporation |
10 / 24 page Rev. 11/14/02 SP3223E +3.0V to +5.5V RS-232 Transceivers © Copyright 2002 Sipex Corporation 10 DESCRIPTION The SP3223E and SP3243E transceivers meet the EIA/TIA-232 and ITU-T V.28/V.24 commu- nication protocols and can be implemented in battery-powered, portable, or hand-held appli- cations such as notebook or palmtop computers. The SP3223E and SP3243E 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 SP3223E and SP3243E devices can operate at a typical data rate of 235kbps fully loaded. The SP3223E is a 2-driver/2-receiver device, and the SP3243E is a 3-driver/5-receiver device ideal for portable or hand-held applications. The SP3243E 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 SP3223E and SP3243E series is an ideal choice for power sensitive designs. The SP3223E and SP3243E 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 SP3223E and SP3243E 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 a data rate of 120Kbps 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 11. Interface Circuitry Controlled by Micropro- cessor Supervisory Circuit SP3243E 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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Descripción similar - SP3223E |
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