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SP3220EBCA Datasheet(PDF) 9 Page - Sipex Corporation |
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SP3220EBCA Datasheet(HTML) 9 Page - Sipex Corporation |
9 / 19 page 9 Rev: A Date:12/11/03 SP3220EB/EU +3.0 to +5.0V RS-232 Transceivers © Copyright 2002 Sipex Corporation DESCRIPTION The SP3220EB/EU device meets 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 SP3220EB/ EU device features 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 +3.0V to +5.5V systems, or +5.0V-only systems that re- quire true RS-232 performance. The SP3220EB device has a driver that can operate at a data rate of 250Kbps fully loaded. The SP3220EU can Operate at 1000Kbps The SP3220EB/EU is a 1-driver/1-receiver de- vice ideal for portable or hand-held applications. The SP3220EB/EU features a 1 µA shutdown mode that reduces power consumption and ex- tends battery life in portable systems. Its receiv- ers remain active in shutdown mode, allowing external devices such as modems to be monitored using only 1 µA supply current. THEORY OF OPERATION The SP3220EB/EU device is 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 input 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 SP3220EB drivers typically can operate at a data rate of 250Kbps fully loaded with 3K Ω in parallel with 1000pF, ensuring compatibility with PC-to-PC communication software. The SP3220EU drivers can guarantee a data rate of 1000Kbps fully loaded with 3 in parallel with 250pF. The slew rate of the SP3220EB output is inter- nally 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 12 shows a loopback circuit used to test the RS-232 driver. Figure 13 shows the test results of the loopback circuit with the SP3220EB driver active at 250Kbps with an RS-232 load in parallel with a 1000pF capacitor. Figure 14 shows the test results where the SP3220EU driver was active at 1000Kbps and loaded with an RS-232 receiver in parallel with a 250pF capacitor. A solid RS-232 data transmission rate of 250Kbps provides compatibility with many designs in personal computer peripherals and LAN applications. The SP3220EB/EU driver's output stage is turned off (high-Z) when the device is in shutdown mode. When the power is off, the SP3220EB/ EU device permits the outputs to be driven up to +12V. The driver's input does not have pull-up resistors. Designers should connect an unused input to V CC or GND. In the shutdown mode, the supply current falls to less than 1 µA, where SHDN = LOW. When the SP3220EB/EU device is shut down, the device's driver output is disabled (high-Z) and the charge pump is 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. SHDN has no effect on RxOUT. Note that the driver is enabled only when the magnitude of V- exceeds approximately 3V. |
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