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SP200EP Datasheet(PDF) 7 Page - Sipex Corporation |
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SP200EP Datasheet(HTML) 7 Page - Sipex Corporation |
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7 / 15 page  7 REV: A DATE:12/03/2003 +5V High-Speed RS232 Transceivers © Copyright 2000 Sipex Corporation Figure 3. Charge Pump Waveforms +10V a) C 2 + GND GND b) C 2 – –10V pump. Each model within the Series incorpo- rates variations of these circuits to achieve the desired configuration and performance. Transmitter/Driver The drivers are inverting transmitters, which ac- cept either TTL or CMOS inputs and output the RS-232 signals with an inverted sense relative to the input logic levels. Typically, the RS-232 out- put voltage swing is ±9V with no load, and ±5V minimum with full load. The transmitter outputs are protected against infinite short–circuits to ground without degradation in reliability. The drivers of the SP200, SP205, SP205B, SP206, SP206B, SP207B, SP211, SP211B and SP213 can be tri–stated by using the SHUTDOWN function. In the “power off” state, the output impedance will remain greater than 300 Ohms, again satisfying the RS-232 specifications. Should the input of the driver be left open, an internal 400kOhm pullup resistor to V CC forces the input high, thus commit- ting the output to a low state. The slew rate of the transmitter output is internally limited to a maxi- mum 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. Receivers The receivers convert RS-232 input signals to inverted TTL signals. Since the input is usually from a transmission line where long cable lengths and system interference can degrade the signal, the inputs have a typical hysteresis margin of 500mV. This ensures that the receiver is virtu- ally immune to noisy transmission lines. Should an input be left unconnected, a 5kOhm pulldown resistor to ground will commit the output of the receiver to a high state. Figure 4. Charge Pump — Phase 3 VCC = +5V –5V +5V –5V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – |
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