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COM20020IP3V Datasheet(PDF) 22 Page - SMSC Corporation |
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COM20020IP3V Datasheet(HTML) 22 Page - SMSC Corporation |
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22 / 82 page  22 DISCONTINUED DATASHEET 20MHZ CLOCK (FOR REF. ONLY) nPULSE1 nPULSE2 DIPULSE RXIN 10 100ns 100ns 200ns 400ns 1 FIGURE 6 - DIPULSE WAVEFORM FOR DATA OF 1-1-0 In typical applications, the serial backplane is terminated at both ends and a bias is provided by the external pull-up resistor. The RXIN signal is directly connected to the cable via an internal Schmitt trigger. A negative pulse on this input indicates a logic "1". Lack of pulse indicates a logic "0". For typical single-ended backplane applications, RXIN is connected to nPULSE1 to make the serial backplane data line. A ground line (from the coax or twisted pair) should run in parallel with the signal. For applications requiring different treatment of the receive signal (like filtering or squelching), nPULSE1 and RXIN remain as independent pins. External differential drivers/receivers for increased range and common mode noise rejection, for example, would require the signals to be independent of one another. |
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