XRT73LC04A_08 Datasheet, PDF (8/64 Pages) Exar Corporation – 4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT

XRT73LC04A
4 CHANNEL DS3/E3/STS-1 LINE INTERFACE UNIT
REV. 1.0.2
PIN DESCRIPTIONS (BY FUNCTION)
TRANSMIT INTERFACE
PIN #
NAME
TYPE
DESCRIPTION
34
TTIP_0
25
TTIP_1
3
TTIP_2
12
TTIP_3
O
Transmit TTIP Output - Channel (n):
The XRT73LC04A uses this pin along with TRing_(n) to transmit a bipo-
lar line signal via a 1:1 transformer.
32
TRing_0
23
TRing_1
5
TRing_2
14
TRing_3
O
Transmit Ring Output - Channel (n):
The XRT73LC04A uses this pin along with TTIP_(n) to transmit a bipolar
line signal via a 1:1 transformer.
42
TxClk_0
30
TxClk_1
139
TxClk_2
7
TxClk_3
I
Transmit Clock Input for TPData and TNData - Channel (n):
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 XRT73LC04A uses this signal to sample the
TPData_(n) and TNData_(n) input pins. By default, the XRT73LC04A is
configured to sample these two pins on the falling edge of this signal.
NOTE: If the XRT73LC04A is operating in the HOST Mode, then the
device can be configured to sample the TPData_(n) and TNData_(n)
input pins on either the rising or falling edge of TxClk_(n).
41
TPData_0
29
TPData_1
140
TPData_2
8
TPData_3
I
Transmit Positive Data Input - Channel (n):
The XRT73LC04A samples this pin on the falling edge of TxClk_(n). If
the device samples a "1", then it generates and transmits a positive
polarity pulse to the line.
The data should be applied to this input pin if the Transmit Section is
configured to accept Single-Rail data from the Terminal Equipment.
NOTE: If the XRT73LC04A is operating in the HOST Mode, then the
XRT73LC04A can be configured to sample the TPData_(n) pin on either
the rising or falling edge of TxClk_(n).
40
TNData_0
28
TNData_1
141
TNData_2
9
TNData_3
I
Transmit Negative Data Input - Channel (n):
The XRT73LC04A samples this pin on the falling edge of TxClk_(n). If
the device samples a "1", then it generates and transmits a negative
polarity pulse to the line.
In Single-Rail Mode, this pin must be tied to GND to enable the HDB3/
B3ZS Encoder and Decoder, (internally pulled-down).
In Dual-Rail Mode this input is the N-Rail Data input.
NOTE: If the XRT73LC04A is operating in the HOST Mode, then the
XRT73LC04A can be configured to sample the TNData_(n) pin on either
the rising or falling edge of TxClk_(n).
4