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SP211E Datasheet(PDF) 7 Page - Sipex Corporation |
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SP211E Datasheet(HTML) 7 Page - Sipex Corporation |
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7 / 16 page  7 SP207EDS/09 SP207E Series High Performance Transceivers © Copyright 2000 Sipex Corporation Figure 4. Charge Pump — Phase 3 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 5k Ω pulldown resistor to ground will commit the output of the receiver to a high state. SHUTDOWN MODE The SP211E, and SP213E all feature a control input which will disable the device and reduce the power supply current to less than 10 µA, making the parts ideal for battery–powered systems. In the “shutdown” mode the receivers and transmitters will both be tri–stated. The V+ output of the charge pump will discharge to V CC, and the V– output will discharge to ground. Products with the Wake-Up function can enable or disable the receivers during shutdown. Figure 5. Charge Pump — Phase 4 VCC = +5V +10V VSS Storage Capacitor VDD Storage Capacitor C1 C2 C3 C4 + + ++ – – – – For complete shutdown to occur and the 10 µA power drain to be realized, the following conditions must be met: SP211E: • +5V must be applied to the SD pin • ENABLE must be either 0V, +5.0V or not connected • the transmitter inputs must be either +5.0V or not connected • V CC must be +5V • Receiver inputs must be >0V and <+5V SP213E: • 0V must be applied to the SD pin • ENABLE must be either 0V, +5.0V or not connected • the transmitter inputs must be either +5.0V or not connected • V CC must be +5V • Receiver inputs must be >0V and <+5V |
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