XRT73L02M Datasheet, PDF (6/46 Pages) Exar Corporation – TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT

XRT73L02M
TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT
xr
REV. 1.0.0
PIN DESCRIPTIONS (BY FUNCTION)
TRANSMIT INTERFACE
PIN #
81
SIGNAL NAME
TxON
TYPE
I
DESCRIPTION
Transmitter ON Input :
This pin is active only when the corresponding TxON bit is set.
Table below shows the status of the transmitter based on theTxON bit and TxON
pin settings.
78
TxCLK_0
48
TxCLK_1
76
TNEG_0
50
TNEG_1
77
TPOS_0
49
TPOS_1
70
TTIP_0
56
TTIP_1
71
TRING_0
55
TRING_1
Bit
Pin
Transmitter Status
0
0
OFF
0
1
OFF
1
0
OFF
1
1
ON
NOTES:
1. This pin will be active and can control the TTIP and TRING outputs only
when the TxON_n bits in the channel register are set .
2. When Transmitters are turned off the TTIP and TRING outputs are Tri-
stated.
3. This pin is internally pulled up.
I
Transmit Clock Input for TPOS and TNEG - Channel 0:
Transmit Clock Input for TPOS and TNEG - Channel 1:
The frequency accuracy of this input clock must be of nominal bit rate ± 20 ppm.
The duty cycle can be 30%-70%.
By default, input data is sampled on the falling edge of TxCLK when input data
is changing on the rising edge of TxCLK..
I
Transmit Negative Data Input - Channel 0:
Transmit Negative Data Input - Channel 1:
In Dual-rail mode, these pins are sampled on the falling or rising edge of
TxCLK_n
NOTE: These input pins are ignored and must be grounded if the Transmitter
Section is configured to accept Single-Rail data from the Terminal Equipment.
I
Transmit Positive Data Input - Channel 0:
Transmit Positive Data Input - Channel 1:
By default sampled on the falling edge of TxCLK
O ^{Transmit TTIP Output - Channel 0:}
Transmit TTIP Output - Channel 1:
These pins along with TRING transmit bipolar signals to the line using a 1:1
transformer.
O ^{Transmit Ring Output - Channel 0:}
Transmit Ring Output - Channel 1:
These pins along with TTIP transmit bipolar signals to the line using a 1:1 trans-
former.
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