XRT73L03 Datasheet, PDF (8/62 Pages) Exar Corporation – 3 CHANNEL E3/DS3/STS-1 LINE INTERFCE UNIT

XRT73L03 3 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
REV. P1.0.13
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PRELIMINARY
PIN DESCRIPTION
PIN #
22
23
24
25
26
27
28
29
30
31
32
33
SIGNAL NAME
TxAVDD3
TNData3
TPData3
TxClk3
TxAGND1
TRing1
TxAVDD1
TTIP1
MTIP1
MRing1
TNData1
TPData1
TYPE
****
I
I
I
****
O
****
O
I
I
I
I
DESCRIPTION
Transmitter Analog 3.3V+ 5% VDD - Transmitter 3
Transmit Negative Data Input - Channel 3:
Refer to the description of pin 32 TnData1
Transmit Positive Data Input - Channel 3:
Refer to the description of pin 33 TPData1
Transmit Clock Input for TPData and TNData - Channel 3:
Refer to the description of pin 34 TxClk1
Transmitter Analog GND - Transmitter 1:
Transmit Ring Output - Channel 1:
The XRT73L03 uses this pin with TTIP1 to transmit a bipolar line signal via a
1:1 transformer.
Transmitter Analog 3.3V+ 5% VDD - Transmitter 1:
Transmit TTIP Output - Channel 1:
The XRT73L03 uses this pin with TRing1 to transmit a bipolar line signal via a
1:1 transformer.
Monitor Tip Input - Channel 1:
The bipolar line output signal from TTIP1 is connected to this pin via a 270-
ohm resistor to check for line driver failure. This pin is internally pulled "High".
Monitor Ring Input - Channel 1:
The bipolar line output signal from TRing1 is connected to this pin via a 270-
ohm resistor to check for line driver failure. This pin is internally pulled "High".
Transmit Negative Data Input - Channel 1:
The XRT73L03 samples this pin on the falling edge of TxClk1. If it samples a
"1", then it generates and transmits a negative polarity pulse to the line.
NOTES:
1. This input pin is ignored and tied to GND if the Transmit Section is
configured to accept Single-Rail data from the Terminal Equipment.
2. If operating in the HOST Mode, it can be configured to sample the
TNData1 pin on either the rising or falling edge of TxClk1.
Transmit Positive Data Input - Channel 1:
The XRT73L03 samples this pin on the falling edge of TxClk. If it samples a
"1", then it generates and transmits a positive polarity pulse to the line.
NOTES:
1. The data should be applied to this input pin if the Transmit Section is
configured to accept Single-Rail data from the Terminal Equipment.
2. If the XRT73L03 is operating in the HOST Mode it can be configured
to sample the TPData1 pin on either the rising or falling edge of
TxClk1.
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