XRT7302IQ80 View Datasheet(PDF) - Exar Corporation
Part Name
Description
MFG CO.
'XRT7302IQ80' PDF : 77 Pages View PDF
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PIN DESCRIPTIONS
PIN DESCRIPTION
PIN #
1
SIGNAL NAME
TxLEV1
2
TAOS1
3
VDD
4
DMO1
5
GND
6
GND
7
VDD
2 CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
XRT7302
REV. 1.1.0
TYPE
I
I
****
O
****
****
DESCRIPTION
Transmit Line Build-Out Enable/Disable Select - Channel 1:
This input pin permits the user to enable or disable the Transmit Line Build-Out
circuit, within Channel 1 of the XRT7302 device.
Setting this pin to "HIGH" disables the Line Build-Out circuit within Channel 1.
In this mode, Channel 1 will output unshaped (e.g., square-wave) pulses onto
the line via the TTIP1 and TRing1 output pins.
Setting this pin to "LOW" enables the Line Build-Out circuit within Channel 1.
In this mode, Channel 1 will output shaped pulses onto the line via the TTIP1
and TRing1 output pins.
In order to comply with the "Isolated DSX-3/STSX-1 Pulse Template Require-
ments (per Bellcore GR-499-CORE or Bellcore GR-253-CORE), the user
should:
1. Set this input pin to "1", if the cable length (between the Cross-Connect and
the transmit output of Channel 1) is greater than 225 feet.
2. Set this input pin to "0", if the cable length (between the Cross-Connect and
the transmit output of Channel 1) is less than 225 feet.
This pin is active only if the following two conditions are true:
a. The XRT7302 is configured to operate in either the DS3 or SONET STS-1
Modes.
b. The XRT7302 is configured to operate in the "Hardware" Mode.
NOTE: Note: The user should tie this pin to GND if the XRT7302 device is
going to be operating in the "Host" Mode
Transmit All Ones Select - Channel 1:
A "high" on this pin causes the Transmit Section, within Channel 1 to generate
and transmit a continuous AMI "All 1s" pattern onto the line. The frequency of
this "1s" pattern is determined by TxClk.
NOTES:
1. This input pin is ignored if the XRT7302 is operating in the "Host"
Mode.
2. The user should tie this pin to GND, if the XRT7302 is going to be
operating in the "Host" Mode.
Transmit Digital VDD (for Transmitter 1)
Drive Monitor Output - Channel 1:
If no transmitted AMI signal is present on MTIP1 and MRing1 input pins for
128±32 TxClk periods, then DMO1 will toggle and remain "high" until the next
AMI signal is detected.
Transmit Digital GND (for Transmitter 1)
Analog GND (Substrate Connection) - Channel 1
Receive Analog VDD (for Receiver 1)
3
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