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SP207HEP Datasheet(PDF) 6 Page - Sipex Corporation |
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SP207HEP Datasheet(HTML) 6 Page - Sipex Corporation |
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6 / 14 page  TGoddard/SP207H/9614R0 SP207H/SP211H High–Speed Transceivers © Copyright 2000 Sipex Corporation 6 Figure 4. Charge Pump — Phase 3 age swing is ±9V with no load, and±5V minimum with full load. The transmitter outputs are pro- tected against infinite short–circuits to ground without degradation in reliability. The SP207HB, SP211H and SP211HB drivers 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. Because of the increased speed, the slew rate is typically 60V/ µS which is above the RS-232 specifcation of 30V/ µS. This is the only param- eter that exceeds the RS-232 limits. Figure 3. Charge Pump Waveforms +10V a) C 2 + GND GND b) C 2 – –10V VCC = +5V –5V +5V –5V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – 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. |
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