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XRT73R12IB Datasheet(PDF) 7 Page - Exar Corporation |
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XRT73R12IB Datasheet(HTML) 7 Page - Exar Corporation |
7 / 89 page XRT73R12 4 REV. 1.0.3 TWELVE CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT C25 AB25 H23 W23 H24 Y26 H3 Y1 H4 W4 C2 AB2 TxNEG0 TxNEG1 TxNEG2 TxNEG3 TxNEG4 TxNEG5 TxNEG6 TxNEG7 TxNEG8 TxNEG9 TxNEG10 TxNEG11 I Transmit Negative Data Input When a Channel has been configured to operate in the Dual-Rail Mode, the user should apply a pulse to this input pin anytime the Transmit Section of the LIU IC to generate a negative-polarity pulse onto the line. This signal will be latched into the Transmit Section circuitry upon the active edge of the TxCLK_n signal. NOTE: In the Single-Rail Mode, this input pin has no function, and should be tied to GND. B24 AE24 C20 AD20 C16 AD16 C11 AD11 C7 AD7 C3 AD3 TTip0 TTip1 TTip2 TTip3 TTip4 TTip5 TTip6 TTip7 TTip8 TTip9 TTip10 TTip11 O Transmit TTIP Output - Positive Polarity Signal These output pins along with the corresponding TRING_n output pins, function as the Transmit DS3/E3/STS-1 Line output signal drivers for a given channel of the XRT73R12. Connect this signal and the corresponding TRING_n output signal to a 1:1 transformer. Whenever the Transmit Section of the Channel generates and transmits a positive-polarity pulse onto the line, this output pin will be pulsed to a high ervoltage than its corresponding TRING_n output pins. Conversely, whenever the Transmit Section of the Channel generates and transmit a negative-polarity pulse onto the line, this output pin will be pulsed to a lower voltage than its corresponding TRING_n output pin. NOTE: This output pin will be tri-stated whenever the TxON input pin or bit-field is set to "0". C24 AD24 B20 AE20 B16 AE16 B11 AE11 B7 AE7 B3 AE3 TRing0 TRing1 TRing2 TRing3 TRing4 TRing5 TRing6 TRing7 TRing8 TRing9 TRing10 TRing11 O Transmit Ring Output - Negative Polarity Signal These output pins along with the corresponding TTIP_n output pins, func- tion as the Transmit DS3/E3/STS-1 Line output signal drivers for a given channel, within the XRT73R12. Connect this signal and the corresponding TTIP_n output signal to a 1:1 transformer. Whenever the Transmit Section of the Channel generates and transmits a positive-polarity pulse onto the line, this output pin will be pulsed to a lower voltage than its corresponding TTIP_n output pin. Conversely, whenever the Transmit Section of the Channel generates and transmit a negative-polarity pulse onto the line, this output pin will be pulsed to a higher voltage than its corresponding TTIP_n output pin. NOTE: This output pin will be tri-stated whenever the TxON input pin or bit-field is set to "0". SYSTEM-SIDE TRANSMIT INPUT AND TRANSMIT CONTROL PINS PIN # SIGNAL NAME TYPE DESCRIPTION |
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