XRT7302IQ80 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT7302IQ80' PDF : 77 Pages View PDF
XRT7302 2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
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REV. 1.1.0
PIN DESCRIPTION
PIN #
73
SIGNAL NAME
TTIP1
74
VDDA
75
MRing1
76
MTIP1
77
TNData1
78
TPData1
79
TxClk1
TYPE
O
****
I
I
I
I
I
DESCRIPTION
Transmit TTIP Output - Channel 1:
The XRT7302 device will use this pin, along with TRing1, to transmit a bipolar
line signal, via a 1:1 transformer.
Transmit Analog VDD - Channel 1
Monitor Ring Input - Channel 1:
The bipolar line output signal, from TRing1 can be connected to this pin, via a
270-ohm resistor, in order to check for line driver failure. This pin is internally
pulled "high".
Monitor Tip Input - Channel 1:
The bipolar line output signal, from TTIP1 can be connected to this pin, via a
270-ohm resistor, in order to check for line driver failure. This pin is internally
pulled "high".
Transmit Negative Data Input - Channel 1:
The XRT7302 device will sample this pin, on the falling edge of TxClk1. If the
device samples a "1" at this input pin, then it will generate and transmit a "neg-
ative" polarity pulse to the line.
NOTES:
1. This input pin will be ignored and should be tied to GND, if the Trans-
mit Section is configured to accept "Single-Rail" data from the Termi-
nal Equipment.
2. If the XRT7302 device is operating in the "Host" Mode, then the user
can (if desired) configure the XRT7302 to sample the TNData pin on
either the rising or falling edge of TxClk.
Transmit Positive Data Input - Channel 1
The XRT7302 device will sample this pin, on the falling edge of TxClk. If the
device samples a "1" at this input pin, then it will generate and transmit a "pos-
itive" 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 XRT7302 device is operating in the "Host" Mode, then the user
can (if desired) configure the XRT7302 to sample the TPData pin on
either the rising or falling edge of TxClk.
Transmit Clock Input for TPData and TNData - Channel 1:
This input pin must be driven at 34.368 MHz (for E3 applications), 44.736 MHz
(for DS3 applications), or 51.84 MHz (for SONET STS-1 applications). The
XRT7302 device will use this signal to sample the TPData and TNData input
pins. By default, the XRT7302 will be configured to sample these two pins on
the falling edge of this signal.
If the XRT7302 device is operating in the "Host" Mode, then the device can be
configured to sample the TPData and TNData input pins on either the rising or
falling edge of TxClk.
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