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SP3222EB_0511 Datasheet(PDF) 8 Page - Sipex Corporation |
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SP3222EB_0511 Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 25 page  Date:11/02/05 SP3222EB/SP3232EB True +3.0V to +5.5V RS-232 Transceivers © Copyright 2005 Sipex Corporation 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 1µA 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 1µA 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 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 1µA, 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 100µs. Connect SHDN to V CC if the shutdown mode is not used. 9 Date: 02/27/05 SP3222EB/3232EB True +3.0 to +5.5V RS-232 Transceivers © Copyright 2005 Sipex Corporation Figure 11. Driver Loopback Test Results at 120kbps Figure 12. Driver Loopback Test Results at 250 kbps Figure 10. SP3222EB/3232EB Driver Loopback Test Circuit SP3222EB SP3232EB GND TxIN TxOUT C1+ C1- C2+ C2- V+ V- VCC 0.1µF 0.1µF 0.1µF + C2 C5 C1 + + C3 C4 + + 0.1µF 0.1µF LOGIC INPUTS VCC 5k RxIN RxOUT LOGIC OUTPUTS EN* *SHDN 1000pF VCC * SP3222EB only |
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