XRT73LC00 Datasheet, PDF (13/53 Pages) Exar Corporation – E3/DS3/STS-1 LINE INTERFACE UNIT

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PRELIMINARY
PIN DESCRIPTION
PIN #
SYMBOL
41
TTIP
42
TxAVDD
43
MRING
44
MTIP
XRT73LC00
E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.1
TYPE
O
-
I
I
DESCRIPTION
Transmit RING Output:
The XRT73LC00 uses this pin along with TRING to transmit a bipolar line signal
via a 1:1 transformer.
NOTE: This output pin along with TRING is tri-stated anytime the TxOFF input
pin or bit-field is set “high”.
Transmit Analog Power Supply
Monitor Ring Input:
This input pin along with the MTIP pin function as the input pins for the Transmit
Drive Monitor. These two input pins are used to determine whether or not a
bipolar line signal is being output via the TTIP and TRING output pins. The
Transmit Drive Monitor circuit will toggle the DMO output pin “high” denoting a
Transmit Line Fault condition if no bipolar pulses are detected via the TTIP/
TRING output pins for 128 bit-periods.
Connect this input pin to the TRING output pin via a 270 ohm resistor.
NOTE: Tie this input pin to GND if you do not intend to use the Transmit Drive
Monitor.
Monitor Tip Input:
This input pin along with the MRING pin function as the input pins for the Trans-
mit Drive Monitor. These two input pins are to be used to determine whether or
not a bipolar line signal is being output via the TTIP and TRING output pins. The
Transmit Drive Monitor circuit will toggle the DMO output pin “high” denoting a
Transmit Line Fault condition if no bipolar pulses are detected via the TTIP/
TRING output pins for 128 bit periods.
Connect this input pin to the TTIP output pin via a 270 ohm resistor.
NOTE: Tie this input pin to GND if you do not intend to use the Transmit Drive
Monitor.
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