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SP3222EUCT Datasheet(PDF) 8 Page - Sipex Corporation |
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SP3222EUCT Datasheet(HTML) 8 Page - Sipex Corporation |
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8 / 20 page  Date: 04/25/06 SP3222EU, SP3232EU 3.3V, 1000Kbps RS-232 Transceivers © Copyright 2006 Sipex Corporation 8 DESCRIPTION The SP3222EU and SP3232EU are 2 driver/ 2receiver devices ideal for portable or hand- held applications. The SP3222EU features a 1 µA shutdown mode that reduces power consumption 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. The SP3222EU/3232EU transceivers meet the EIA/TIA-232 and V.28/V.24 communication protocols They 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. The SP3222EU/3232EU drivers operate at a minimum data rate of 1000kbps. THEORY OF OPERATION The SP3222EU/3232EU 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 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 drivers have a minimum data rate of 1000kbps fully loaded with 3K Ω in parallel with 250pF, ensuring compatibility with PC-to-PC communication software. Figure 11 shows a loopback test circuit used to the RS-232 drivers. Figure 12 shows the test results of the loopback circuit with all drivers active at 250kbps with RS-232 loads in parallel with 1000pF capacitors. Figure 13 shows the test results where one driver was active at 1000kbps and all drivers loaded with an RS-232 receiver in parallel with a 250pF capacitor. The SP3222EU driver's output stages are tristated in shutdown mode. When the power is off, the SP3222EU device permits the outputs to be driven up to ±12V. Because the driver's inputs do not have pull-up resistors, unused inputs should be connected to V CC or GND. In the shutdown mode, the supply current is less than 1 µA, where SHDN = LOW. When the SP3222EU 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. Receivers The receivers convert EIA/TIA-232 levels to TTL or CMOS logic output levels. The SP3222EU receivers have an inverting tri-state output. Receiver outputs (RxOUT) are tri- stated when the enable control EN = HIGH. In the shutdown mode, the receivers can be active or inactive. EN has no effect on TxOUT. The truth table logic of the SP3222EU driver and receiver outputs can be found in Table 2. |
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