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SP3220EB Datasheet(PDF) 9 Page - Sipex Corporation |
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SP3220EB Datasheet(HTML) 9 Page - Sipex Corporation |
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9 / 21 page  Date: 8/30/05 SP3220E/EB/EU High ESD RS-232 Driver/Receiver © Copyright 2005 Sipex Corporation 9 Date: 8/22/05 SP3220E/EB/EU High ESD RS-232 Driver/Receiver © Copyright 2005 Sipex Corporation DESCRIPTION The SP3220E/EB/EU devices 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 SP3220E/EB/EU de- vices 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 +3.0V to +5.5V systems, or +5.0V-only systems that require true RS-232 performance. The SP3220EB device has a driver that can oper- ate at a data rate of 250Kbps fully loaded. The SP3220EUcanoperateat1000Kbps; theSP3220E operates at a typical data rate of 235Kbps fully loaded. The SP3220E/EB/EU is a 1-driver/1-receiver de- vice ideal for portable or hand-held applications. The SP3220E/EB/EU features a 1µA shutdown mode that reduces power consumption and ex- tends battery life in portable systems. Its receivers remains active in shutdown mode, allowing exter- nal devices to be monitored using only 1µA supply current. THEORY OF OPERATION The SP3220E/EB/EU devices are made up of three basic circuit blocks: 1. Driver, 2. Receiver, and 3. the Sipex proprietary charge pump. Driver The driver is an inverting level transmitter that converts 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 fullyloaded.Thedriveroutputsareprotectedagainst infinite short-circuits to ground without degrada- tion in reliability. Driver outputs will meet EIA/TIA- 562 levels of +3.7V with supply voltages as low as 2.7V. The SP3220EB driver typically can operate at a data rate of 250Kbps fully loaded with 3K in parallel with 1000pF, ensuring compatibility with PC-to-PC communication software. The SP3220EU driver can guarantee a data rate of 1000Kbps fully loaded with 3 in parallel with 250pF. The slew rate of the SP3220E and SP3220EB outputs are 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. The slew rate of the SP3220EU is not internally limited. This allows it to transmit at much faster data rates. 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 com- patibility with many designs in personal computer peripherals and LAN applications. TheSP3220E/EB/EUdriver'soutputstageisturned off (high-Z) when the device is in shutdown mode. When the power is off, the SP3220E/EB/EU de- vice 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 1µA, where SHDN = LOW. When the SP3220E/EB/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 100ms. 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 approxi- mately 3V. |
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