XRT75L02 Datasheet, PDF (6/50 Pages) Exar Corporation – TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER

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REV. 1.0.3
XRT75L02
TWO CHANNEL E3/DS3/STS-1 LINE INTERFACE UNIT WITH JITTER
PIN DESCRIPTIONS (BY FUNCTION)
TRANSMIT INTERFACE
PIN #
SIGNAL NAME
TYPE
DESCRIPTION
81
TxON
I Transmitter ON Input :
This input pin is used to either enable or disable the Transmit Output Driver.
"Low" - Disables the Transmit Output Driver. In this setting, the TTIP and
TRING output pins will be tri-stated.
"High" - Enables the Transmit Output Driver. In this setting, the TTIP and
TRING output pins will be enabled.
NOTES:
1. Even when the XRT75L02 is configured in HOST mode, this pin will be
active. To enable software control of the Transmit Output Driver
output, pull this pin "High".
2. When the Transmitter is turned off either in Host or Hardware mode,
the TTIP and TRing outputs are Tri-stated.
3. This pins are internally pulled "High"
78
TxCLK_0
48
TxCLK_1
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..
76
TNEG_0
50
TNEG_1
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.
77
TPOS_0
49
TPOS_1
I Transmit Positive Data Input - Channel 0:
Transmit Positive Data Input - Channel 1:
By default sampled on the falling edge of TxCLK
70
TTIP_0
56
TTIP_1
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.
71
TRING_0
55
TRING_1
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.
4