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SP3232EBCA Datasheet(PDF) 8 Page - Sipex Corporation |
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SP3232EBCA Datasheet(HTML) 8 Page - Sipex Corporation |
8 / 20 page Date:02/27/05 SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers © Copyright 2005 Sipex Corporation 8 DESCRIPTION The SP3222EB/3232EB transceivers meet the EIA/TIA-232 and 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 SP3222EB/3232EB devices all feature Sipex's proprietary on-board charge pump circuitry that generates 2 x V CC for RS-232 voltage levels from a single +3.0V to +5.5V power supply. This series is ideal for +3.3V-only systems, mixed +3.3V to +5.5V systems, or +5.0V-only systems that require true RS-232 performance. The SP3222EB/3232EB series have drivers that operate at a typical data rate of 250kbps fully loaded. The SP3222EB and SP3232EB are 2-driver/2- receiver devices ideal for portable or hand-held applications. The SP3222EB features a 1 µA shutdown mode that reduces power consump- tion and extends battery life in portable systems. Its receivers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1 µA supply current. THEORY OF OPERATION The SP3222EB/3232EB series are made up of three basic circuit blocks: 1. Drivers, 2. Receivers, and 3. the Sipex proprietary charge pump. Drivers The drivers are inverting level transmitters that convert TTL or CMOS logic levels to ±5.0V EIA/TIA-232 levels inverted relative to the in- put logic levels. Typically, the RS-232 output voltage swing is ±5.5V with no load and at least ±5V minimum fully loaded. The driver outputs are protected against infinite short-circuits to ground without degradation in reliability. Driver outputs will meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V. 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 10 shows a loopback test circuit used to the RS-232 drivers. Figure 11 shows the test results of the loopback circuit with all drivers active at 120kbps with RS-232 loads in parallel with 1000pF capacitors. Figure 12 shows the test results where one driver was active at 250kbps and all drivers loaded with an RS-232 receiver in parallel with a 1000pF capacitor. A solid RS-232 data transmission rate of 250kbps provides compatibility with many designs in personal computer peripherals and LAN appli- cations. The SP3222EB driver's output stages are turned off (tri-state) when the device is in shutdown mode. When the power is off, the SP3222EB device permits the outputs to be driven up to ±12V. The driver's inputs do not have pull-up resistors. Designers should connect unused in- puts to V CC or GND. In the shutdown mode, the supply current falls to less than 1 µA, where SHDN = LOW. When the SP3222EB device is shut down, the device's driver outputs are disabled (tri-stated) and the charge pumps are turned off with V+ pulled down to V CC and V- pulled to GND. The time required to exit shutdown is typically 100 µs. Connect SHDN to V CC if the shutdown mode is not used. |
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